Java 重新绘制JButton
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使用paintComponent()方法绘制的各种Button：
正常状态：
获得焦点状态：
被按下状态：
被释放状态：
实现代码：
package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.font.LineMetrics;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.Rectangle2D;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.UIManager;import javax.swing.UIManager.LookAndFeelInfo;import javax.swing.UnsupportedLookAndFeelException;@SuppressWarnings("serial")public class JButton_Bg extends JFrame {public JButton_Bg() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}// TODO Auto-generated constructor stubContainer c = getContentPane();c.setLayout(new FlowLayout());final JButton button = new MyButton("button 2");c.add(button);JButton button2 = new JButton("button 2");c.add(button2);button2.setBackground(Color.blue);JButton button3 = new MyButton2("Cancel");c.add(button3);// 完全重绘的Button，其Text的HTML设置特性消失// JButton button4 = new// MyButton3("<html><font size=12>Sub</font></html>");JButton button4 = new MyButton3("Sub");// button4.setFont(new Font("Serif", Font.PLAIN, 14));c.add(button4);}private class MyButton extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// 无参构造继承时自动调用，而有参构造继承时则需手动重写MyButton(String text) {// super("<html><font size=5>" + text + "</font></html>");super(text);this.text = text;// 下 面的代码块若是放到下面的paintComponent()方法里则Swing界面初始化时，// 布局管理器还是采用的是系统默认的PreferredSize。因为构造函数要优先于// paintComponent()方法执行。Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getPreferredSize().width;int height = this.getPreferredSize().height;if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height,height);g2.fill(shape);// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2, 0, height,height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2 + offsetCenter,height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height, height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2)+ offsetCenter,(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent()))+ offsetCenter);} else if (state.equals("released")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2, 0, height,height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}// Gives the UI delegate an opportunity to define the precise shape of// this component for the sake of mouse processing.@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}private class MyButton2 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// Initialize the size of the button according to the length and width// of the text stringMyButton2(String text) {super(text);this.text = text;}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getWidth();int height = this.getHeight();if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}private class MyButton3 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// Initialize the size of the button according to the length and width// of the text stringMyButton3(String text) {super(text);this.text = text;}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getWidth();int height = this.getHeight();if (state.equals("normal")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {g2.setColor(new Color(0, 147, 255));g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);double borderWidth = 2.0f; // 2 pixelsg2.fill(new RoundRectangle2D.Double(borderWidth, borderWidth,width - borderWidth * 2.0f,height - borderWidth * 2.0f, height - borderWidth* 2.0f, height - borderWidth * 2.0f));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg frame = new JButton_Bg();frame.pack();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}添加了背景图片的Button：
显然当按钮大小改变时，背景图片有失真。
实现代码：
package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.font.LineMetrics;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.Rectangle2D;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.UIManager;import javax.swing.UIManager.LookAndFeelInfo;import javax.swing.UnsupportedLookAndFeelException;@SuppressWarnings("serial")public class JButton_Bg extends JFrame {public JButton_Bg() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}// TODO Auto-generated constructor stubContainer c = getContentPane();c.setLayout(new FlowLayout());final JButton button = new MyButton("button 2");c.add(button);JButton button2 = new JButton("button 2");c.add(button2);button2.setBackground(Color.blue);JButton button3 = new MyButton2("Cancel");c.add(button3);// 完全重绘的Button，其Text的HTML设置特性消失// JButton button4 = new// MyButton3("<html><font size=12>Sub</font></html>");JButton button4 = new MyButton3("Sub");// button4.setFont(new Font("Serif", Font.PLAIN, 14));c.add(button4);}private class MyButton extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// 无参构造继承时自动调用，而有参构造继承时则需手动重写MyButton(String text) {// super("<html><font size=5>" + text + "</font></html>");super(text);this.text = text;// 下 面的代码块若是放到下面的paintComponent()方法里则Swing界面初始化时，// 布局管理器还是采用的是系统默认的PreferredSize。因为构造函数要优先于// paintComponent()方法执行。Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getPreferredSize().width;int height = this.getPreferredSize().height; BufferedImage img; try { img = ImageIO.read(this.getClass().getResource( "/images/icon.jpg")); g2.drawImage(img, 0, 0, width, height, this); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); }if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height,height);g2.fill(shape);// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2, 0, height,height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2 + offsetCenter,height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height, height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2)+ offsetCenter,(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent()))+ offsetCenter);} else if (state.equals("released")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2, 0, height,height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}// Gives the UI delegate an opportunity to define the precise shape of// this component for the sake of mouse processing.@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}private class MyButton2 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// Initialize the size of the button according to the length and width// of the text stringMyButton2(String text) {super(text);this.text = text;}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getWidth();int height = this.getHeight();if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}private class MyButton3 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";Shape shape;// Initialize the size of the button according to the length and width// of the text stringMyButton3(String text) {super(text);this.text = text;}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);int width = this.getWidth();int height = this.getHeight();if (state.equals("normal")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {g2.setColor(new Color(0, 147, 255));g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);double borderWidth = 2.0f; // 2 pixelsg2.fill(new RoundRectangle2D.Double(borderWidth, borderWidth,width - borderWidth * 2.0f,height - borderWidth * 2.0f, height - borderWidth* 2.0f, height - borderWidth * 2.0f));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new RoundRectangle2D.Double(0, 0, width, height,height, height));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";repaint();}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";repaint();}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被按下，");state = "pressed";repaint();}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.print("鼠标按键被释放，");state = "released";repaint();}});}@Overridepublic boolean contains(int x, int y) {if (shape.contains(x, y)) {return true;} else {return false;}}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg frame = new JButton_Bg();frame.pack();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}其中的核心修改代码：
使用基于Nimbus包的Customize出属于自己的Look and Feel：
使用Painter可以保留按钮的HTML特性（因为自己不需要重画 Text）
package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics2D;import java.awt.Insets;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.RoundRectangle2D;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.Painter;import javax.swing.UIDefaults;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;import javax.swing.UIManager.LookAndFeelInfo;/** * 使用了Nimbus的个性化组件方法。使用Painter可以保留按钮的HTML特性（因为自己不需要重画 Text）。 * * @see JButton_Bg * @author HAN * */@SuppressWarnings("serial")public class JButton_Bg_2 extends JFrame {static JButton button;static JButton buttonBg;static JButton buttonExtended1;static JButton buttonExtended2;static JButton buttonExtended3;public JButton_Bg_2() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}Container c = getContentPane();c.setLayout(new FlowLayout());button = new JButton("button");c.add(button);buttonBg = new JButton("button");c.add(buttonBg);buttonBg.setBackground(Color.blue);buttonExtended1 = new JButtonExtended1("OK");buttonExtended1.setForeground(Color.GREEN);c.add(buttonExtended1);buttonExtended2 = new JButtonExtended2("<html><u>C</u>ancel</html>");c.add(buttonExtended2);buttonExtended3 = new JButtonExtended3("Sub");c.add(buttonExtended3);}private class JButtonExtended1 extends JButton {Shape shape;JButtonExtended1(String text) {super(text);// 设置按钮默认文本颜色为红色this.setForeground(Color.RED);// 设置按钮默认区域为正方形Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);/* customize button */UIDefaults sliderDefaults = new UIDefaults();sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2,0, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2,0, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2+ offsetCenter, height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height,height));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}private class JButtonExtended2 extends JButton {Shape shape;JButtonExtended2(String text) {super(text);/* customize button */UIDefaults sliderDefaults = new UIDefaults();// sliderDefaults.put("Button.defaultButtonFollowsFocus", false);sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {// // Rendering operations have no effect outside of// // the clipping area.// g.setClip(0, 0, height, height);g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width,height, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}private class JButtonExtended3 extends JButton {Shape shape;JButtonExtended3(String text) {super(text);/* customize button */UIDefaults sliderDefaults = new UIDefaults();sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width,height, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patterng.setColor(new Color(0, 147, 255));g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));Point2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);double borderWidth = 0.0f; // 0 pixels, no borderg.fill(new RoundRectangle2D.Double(borderWidth,borderWidth, width - borderWidth * 2.0f,height - borderWidth * 2.0f, height- borderWidth * 2.0f, height- borderWidth * 2.0f));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg_2 frame = new JButton_Bg_2();frame.setLocationRelativeTo(null);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// If you want to ensure that a particular component gains the focus// the first time a window is activated, you can call the// requestFocusInWindow method on the component after the component// has been realized, but before the frame is displayed.frame.pack(); // Realize the components.// This button will have the initial focus.buttonExtended2.requestFocusInWindow();frame.setVisible(true);// Display the window.}}下面的只是对以上总共3种方法做了代码优化：
package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.font.LineMetrics;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.Rectangle2D;import java.awt.geom.RoundRectangle2D;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.UIManager;import javax.swing.UIManager.LookAndFeelInfo;import javax.swing.UnsupportedLookAndFeelException;/** * 使用了重绘JButton的个性化组件方法。使用paint()不可以保留按钮的HTML特性（因为目前自己 * 还没找到怎么画带HTML特性的String的方法）。 * <p> * 采用了fire JButton的ActionEvent方法来画各种不同的按钮状态。 * * @see JButton_Bg_2 * @see JButton_Bg_3 * @author HAN * */@SuppressWarnings("serial")public class JButton_Bg extends JFrame {public JButton_Bg() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}// TODO Auto-generated constructor stubContainer c = getContentPane();c.setLayout(new FlowLayout());final JButton button = new MyButton("button 2");c.add(button);JButton button2 = new JButton("button 2");c.add(button2);button2.setBackground(Color.blue);JButton button3 = new MyButton2("Cancel");c.add(button3);// 完全重绘的Button，其Text的HTML设置特性消失// JButton button4 = new// MyButton3("<html><font size=12>Sub</font></html>");JButton button4 = new MyButton3("Sub");// button4.setFont(new Font("Serif", Font.PLAIN, 14));c.add(button4);}private class MyButton extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";private int width;private int height;private Shape shape;// 无参构造继承时自动调用，而有参构造继承时则需手动重写MyButton(String text) {// super("<html><font size=5>" + text + "</font></html>");super(text);this.text = text;// 下面的代码块若是放到下面的paintComponent()方法里则Swing界面初始化时，// 布局管理器还是采用的是系统默认的PreferredSize。因为构造函数要优先于// paintComponent()方法执行。Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);// 自定义鼠标热点区域shapewidth = getPreferredSize().width;height = getPreferredSize().height;shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height,height);}@Overrideprotected void paintComponent(Graphics g) {System.out.println("paintComponent");Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2 + offsetCenter,height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height, height));// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2)+ offsetCenter,(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent()))+ offsetCenter);} else if (state.equals("released")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textg2.setColor(Color.RED);Font defaultFont = getFont();g2.setFont(defaultFont);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";// repaint();// 可有可无，因为鼠标事件本身自动触发paintComponent()}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被按下，");state = "pressed";}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被释放，");state = "released";}});}// Gives the UI delegate an opportunity to define the precise shape of// this component for the sake of mouse processing.@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}private class MyButton2 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";private int width;private int height;private Shape shape;MyButton2(String text) {super(text);this.text = text;// 自定义鼠标热点区域shapethis.width = getPreferredSize().width;this.height = getPreferredSize().height;this.shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被按下，");state = "pressed";}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被释放，");state = "released";}});}@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}private class MyButton3 extends JButton {private String text;private String state = "normal";// private String state = "focused";// private String state = "pressed";// private String state = "released";private int width;private int height;private Shape shape;MyButton3(String text) {super(text);this.text = text;// 自定义鼠标热点区域shapethis.width = getPreferredSize().width;this.height = getPreferredSize().height;this.shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);}@Overrideprotected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (state.equals("normal")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("focused")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("pressed")) {// draw background patterng2.setColor(new Color(0, 147, 255));g2.fill(shape);Point2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);double borderWidth = 2.0f; // 2 pixelsg2.fill(new RoundRectangle2D.Double(borderWidth, borderWidth,width - borderWidth * 2.0f,height - borderWidth * 2.0f, height - borderWidth* 2.0f, height - borderWidth * 2.0f));// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));} else if (state.equals("released")) {// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);// draw string textFont defaultFont = getFont();g2.setFont(defaultFont);g2.setColor(Color.BLACK);Rectangle2D rect = defaultFont.getStringBounds(text,g2.getFontRenderContext());LineMetrics lineMetrics = defaultFont.getLineMetrics(text,g2.getFontRenderContext());g2.drawString(text,(float) (width / 2 - rect.getWidth() / 2),(float) ((height / 2) + ((lineMetrics.getAscent() + lineMetrics.getDescent()) / 2 - lineMetrics.getDescent())));}addMouseListener(new MouseAdapter() {@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移入组件");state = "focused";}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("光标移出组件");state = "normal";}@Overridepublic void mousePressed(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被按下，");state = "pressed";}@Overridepublic void mouseReleased(MouseEvent e) {// TODO Auto-generated method stubSystem.out.println("鼠标按键被释放，");state = "released";}});}@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg frame = new JButton_Bg();frame.pack();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.RoundRectangle2D;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.UIManager;import javax.swing.UIManager.LookAndFeelInfo;import javax.swing.UnsupportedLookAndFeelException;/** * 使用了重绘JButton的个性化组件方法。使用paint()保留了按钮的HTML特性（因为通过 setContentAreafilled(false) + * super.paintComponent(g) 这一方法使我们不需画带HTML特性的String）。 * <p> * 采用了JButton的getModel()方法（State model for buttons.）来画各种不同的按钮状态。 * * @see JButton_Bg * @see JButton_Bg_3 * @author HAN * */@SuppressWarnings("serial")public class JButton_Bg_2 extends JFrame {public JButton_Bg_2() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}// TODO Auto-generated constructor stubContainer c = getContentPane();c.setLayout(new FlowLayout());final JButton button = new MyButton("button 2");System.out.println(button.isPreferredSizeSet());c.add(button);JButton button2 = new JButton("button 2");c.add(button2);button2.setBackground(Color.blue);System.out.println(button2.isPreferredSizeSet());JButton button3 = new MyButton2("Cancel");c.add(button3);// 完全重绘的Button，其Text的HTML设置特性消失// JButton button4 = new// MyButton3("<html><font size=12>Sub</font></html>");JButton button4 = new MyButton3("<html>Su<u>b</u></html>");// button4.setFont(new Font("Serif", Font.PLAIN, 14));c.add(button4);}private class MyButton extends JButton {private int width;private int height;private Shape shape;// 无参构造继承时自动调用，而有参构造继承时则需手动重写MyButton(String text) {super(text);setContentAreaFilled(false);setForeground(Color.RED);// 下面的代码块若是放到下面的paintComponent()方法里则Swing界面初始化时，// 布局管理器还是采用的是系统默认的PreferredSize。因为构造函数要优先于// paintComponent()方法执行。// 变方形按钮为圆形Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);// 自定义鼠标热点区域shapewidth = getPreferredSize().width;height = getPreferredSize().height;shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height,height);}@Overrideprotected void paintComponent(Graphics g) {System.out.println();System.out.print("paintComponent\t");Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (this.getModel().isEnabled()) {System.out.print("isEnabled\t");if (this.getModel().isRollover()) {System.out.print("isRollover\t");if (this.getModel().isPressed()) {System.out.print("isPressed\t");// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2+ offsetCenter, height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);g2.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height, height));} else {// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}} else {System.out.print("Normal\t");// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}}super.paintComponent(g);}// Gives the UI delegate an opportunity to define the precise shape of// this component for the sake of mouse processing.@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}private class MyButton2 extends JButton {private int width;private int height;private Shape shape;MyButton2(String text) {super(text);setContentAreaFilled(false);// 自定义鼠标热点区域shapethis.width = getPreferredSize().width;this.height = getPreferredSize().height;this.shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);}protected void paintComponent(Graphics g) {System.out.println();System.out.print("paintComponent\t");Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (this.getModel().isEnabled()) {System.out.print("isEnabled\t");if (this.getModel().isRollover()) {System.out.print("isRollover\t");if (this.getModel().isPressed()) {System.out.print("isPressed\t");// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);g2.fill(shape);} else {// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}} else {System.out.print("Normal\t");// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}}super.paintComponent(g);}@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}private class MyButton3 extends JButton {private int width;private int height;private Shape shape;MyButton3(String text) {super(text);setContentAreaFilled(false);// 自定义鼠标热点区域shapethis.width = getPreferredSize().width;this.height = getPreferredSize().height;this.shape = new RoundRectangle2D.Double(0, 0, width, height,height, height);}protected void paintComponent(Graphics g) {System.out.println();System.out.print("paintComponent\t");Graphics2D g2 = (Graphics2D) g;g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);if (this.getModel().isEnabled()) {System.out.print("isEnabled\t");if (this.getModel().isRollover()) {System.out.print("isRollover\t");if (this.getModel().isPressed()) {System.out.print("isPressed\t");// draw background patterng2.setColor(new Color(0, 147, 255));g2.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));Point2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);double borderWidth = 2.0f; // 2 pixelsg2.fill(new RoundRectangle2D.Double(borderWidth,borderWidth, width - borderWidth * 2.0f, height- borderWidth * 2.0f, height- borderWidth * 2.0f, height- borderWidth * 2.0f));} else {// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}} else {System.out.print("Normal\t");// draw background patternPoint2D center = new Point2D.Float(width / 2, height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center,radius, dist, colors);g2.setPaint(paint);g2.fill(shape);}}super.paintComponent(g);}@Overridepublic boolean contains(int x, int y) {return shape.contains(x, y);}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg_2 frame = new JButton_Bg_2();frame.pack();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}package com.han;import java.awt.Color;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics2D;import java.awt.Insets;import java.awt.RadialGradientPaint;import java.awt.RenderingHints;import java.awt.Shape;import java.awt.geom.Ellipse2D;import java.awt.geom.Point2D;import java.awt.geom.RoundRectangle2D;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.Painter;import javax.swing.UIDefaults;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;import javax.swing.UIManager.LookAndFeelInfo;/** * 使用了Nimbus的个性化组件方法。使用Painter可以保留按钮的HTML特性（因为自己不需要重画 Text）。 * * @see JButton_Bg * @see JButton_Bg_2 * @author HAN * */@SuppressWarnings("serial")public class JButton_Bg_3 extends JFrame {static JButton button;static JButton buttonBg;static JButton buttonExtended1;static JButton buttonExtended2;static JButton buttonExtended3;public JButton_Bg_3() {for (LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {if (laf.getName().equals("Nimbus")) {try {UIManager.setLookAndFeel(laf.getClassName());} catch (ClassNotFoundException | InstantiationException| IllegalAccessException| UnsupportedLookAndFeelException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}Container c = getContentPane();c.setLayout(new FlowLayout());button = new JButton("button");c.add(button);buttonBg = new JButton("button");c.add(buttonBg);buttonBg.setBackground(Color.blue);buttonExtended1 = new JButtonExtended1("OK");buttonExtended1.setForeground(Color.GREEN);c.add(buttonExtended1);buttonExtended2 = new JButtonExtended2("<html><u>C</u>ancel</html>");c.add(buttonExtended2);buttonExtended3 = new JButtonExtended3("Sub");c.add(buttonExtended3);}private class JButtonExtended1 extends JButton {private Shape shape;JButtonExtended1(String text) {super(text);// 设置按钮默认文本颜色为红色this.setForeground(Color.RED);// 设置按钮默认区域为正方形Dimension preferredSize = getPreferredSize();Dimension preferredSizeNew = new Dimension(preferredSize.width,preferredSize.width);setPreferredSize(preferredSizeNew);/* customize button */UIDefaults sliderDefaults = new UIDefaults();sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new Ellipse2D.Double(width / 2 - height / 2, 0, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2,0, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2,0, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternint offsetCenter = 1;Point2D center = new Point2D.Float(width / 2+ offsetCenter, height / 2 + offsetCenter);float radius = height / 2;float[] dist = { 0.2f, 1.0f };Color[] colors = { new Color(0, 0, 0, 255),new Color(255, 255, 255, 0) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new Ellipse2D.Double(width / 2 - height / 2+ offsetCenter, offsetCenter, height,height));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}private class JButtonExtended2 extends JButton {Shape shape;JButtonExtended2(String text) {super(text);/* customize button */UIDefaults sliderDefaults = new UIDefaults();// sliderDefaults.put("Button.defaultButtonFollowsFocus", false);sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {// // Rendering operations have no effect outside of// // the clipping area.// g.setClip(0, 0, height, height);g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width,height, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}private class JButtonExtended3 extends JButton {Shape shape;JButtonExtended3(String text) {super(text);/* customize button */UIDefaults sliderDefaults = new UIDefaults();sliderDefaults.put("Button.contentMargins",new Insets(6, 14, 6, 14));sliderDefaults.put("Button[Enabled].backgroundPainter",new Painter<JComponent>() {public void paint(Graphics2D g, JComponent c,int width, int height) {g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(0, 0, 0, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);shape = new RoundRectangle2D.Double(0, 0, width,height, height, height);g.fill(shape);}});sliderDefaults.put("Button[MouseOver].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused].backgroundPainter",new Painter<JComponent>() {// The paint is the same as MouseOver@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patternPoint2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 0.8f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));}});sliderDefaults.put("Button[Focused+Pressed].backgroundPainter",new Painter<JComponent>() {@Overridepublic void paint(Graphics2D g, JComponent object,int width, int height) {// TODO Auto-generated method stubg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// draw background patterng.setColor(new Color(0, 147, 255));g.fill(new RoundRectangle2D.Double(0, 0, width,height, height, height));Point2D center = new Point2D.Float(width / 2,height / 2);float radius = width / 2;float[] dist = { 0.0f, 1.0f };Color[] colors = { new Color(255, 255, 255, 0),new Color(20, 20, 20, 255) };RadialGradientPaint paint = new RadialGradientPaint(center, radius, dist, colors);g.setPaint(paint);double borderWidth = 0.0f; // 0 pixels, no borderg.fill(new RoundRectangle2D.Double(borderWidth,borderWidth, width - borderWidth * 2.0f,height - borderWidth * 2.0f, height- borderWidth * 2.0f, height- borderWidth * 2.0f));}});this.putClientProperty("Nimbus.Overrides", sliderDefaults);// replace the defaultsthis.putClientProperty("Nimbus.Overrides.InheritDefaults", false);}@Overridepublic boolean contains(int x, int y) {try {if (shape.contains(x, y)) {return true;} else {return false;}} catch (NullPointerException e) {System.out.println("NullPointerException");}return super.contains(x, y);}}public static void main(String[] args) {// TODO Auto-generated method stubJButton_Bg_3 frame = new JButton_Bg_3();frame.setLocationRelativeTo(null);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// If you want to ensure that a particular component gains the focus// the first time a window is activated, you can call the// requestFocusInWindow method on the component after the component// has been realized, but before the frame is displayed.frame.pack(); // Realize the components.// This button will have the initial focus.buttonExtended2.requestFocusInWindow();frame.setVisible(true);// Display the window.}}- Java 重新绘制JButton
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