JAVA实现屏幕抓图

主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。

package com.test;import java.awt.AWTException;import java.awt.BorderLayout;import java.awt.Cursor;import java.awt.Graphics;import java.awt.Rectangle;import java.awt.Robot;import java.awt.Toolkit;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionAdapter;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;import javax.swing.Icon;import javax.swing.ImageIcon;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;/** * @Author Qiu_BaiChao 一个简单的屏幕抓图 *  */public class ScreenCapture {// test mainpublic static void main(String[] args) throws Exception {File tempFile = new File("d:", "temp.png");ScreenCapture capture = ScreenCapture.getInstance();capture.captureImage();JFrame frame = new JFrame();JPanel panel = new JPanel();panel.setLayout(new BorderLayout());JLabel imagebox = new JLabel();panel.add(BorderLayout.CENTER, imagebox);imagebox.setIcon(capture.getPickedIcon());capture.saveAsPNG(tempFile);frame.setContentPane(panel);frame.setSize(400, 300);frame.setVisible(true);System.out.println("Over");}private ScreenCapture() {try {robot = new Robot();} catch (AWTException e) {System.err.println("Internal Error: " + e);e.printStackTrace();}JPanel cp = (JPanel) dialog.getContentPane();cp.setLayout(new BorderLayout());labFullScreenImage.addMouseListener(new MouseAdapter() {public void mouseReleased(MouseEvent evn) {isFirstPoint = true;pickedImage = fullScreenImage.getSubimage(recX, recY, recW,recH);dialog.setVisible(false);}});labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {public void mouseDragged(MouseEvent evn) {if (isFirstPoint) {x1 = evn.getX();y1 = evn.getY();isFirstPoint = false;} else {x2 = evn.getX();y2 = evn.getY();int maxX = Math.max(x1, x2);int maxY = Math.max(y1, y2);int minX = Math.min(x1, x2);int minY = Math.min(y1, y2);recX = minX;recY = minY;recW = maxX - minX;recH = maxY - minY;labFullScreenImage.drawRectangle(recX, recY, recW, recH);}}public void mouseMoved(MouseEvent e) {labFullScreenImage.drawCross(e.getX(), e.getY());}});cp.add(BorderLayout.CENTER, labFullScreenImage);dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));dialog.setAlwaysOnTop(true);dialog.setMaximumSize(Toolkit.getDefaultToolkit().getScreenSize());dialog.setUndecorated(true);dialog.setSize(dialog.getMaximumSize());dialog.setModal(true);}// Singleton Patternpublic static ScreenCapture getInstance() {return defaultCapturer;}/** 捕捉全屏慕 */public Icon captureFullScreen() {fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));ImageIcon icon = new ImageIcon(fullScreenImage);return icon;}/** * 捕捉屏幕的一个矫形区域 */public void captureImage() {fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));ImageIcon icon = new ImageIcon(fullScreenImage);labFullScreenImage.setIcon(icon);dialog.setVisible(true);}/** 得到捕捉后的BufferedImage */public BufferedImage getPickedImage() {return pickedImage;}/** 得到捕捉后的Icon */public ImageIcon getPickedIcon() {return new ImageIcon(getPickedImage());}/** * 储存为一个文件,为PNG格式 *  * @deprecated replaced by saveAsPNG(File file) */@Deprecatedpublic void saveToFile(File file) throws IOException {ImageIO.write(getPickedImage(), defaultImageFormater, file);}/** 储存为一个文件,为PNG格式 */public void saveAsPNG(File file) throws IOException {ImageIO.write(getPickedImage(), "png", file);}/** 储存为一个JPEG格式图像文件 */public void saveAsJPEG(File file) throws IOException {ImageIO.write(getPickedImage(), "JPEG", file);}/** 写入一个OutputStream */public void write(OutputStream out) throws IOException {ImageIO.write(getPickedImage(), defaultImageFormater, out);}// singleton design patternprivate static ScreenCapture defaultCapturer = new ScreenCapture();private int x1, y1, x2, y2;private int recX, recY, recH, recW; // 截取的图像private boolean isFirstPoint = true;private BackgroundImage labFullScreenImage = new BackgroundImage();private Robot robot;private BufferedImage fullScreenImage;private BufferedImage pickedImage;private String defaultImageFormater = "png";private JDialog dialog = new JDialog();}/** 显示图片的Label */class BackgroundImage extends JLabel {/** *  */private static final long serialVersionUID = 1L;public void paintComponent(Graphics g) {super.paintComponent(g);g.drawRect(x, y, w, h);String area = Integer.toString(w) + " * " + Integer.toString(h);g.drawString(area, x + (int) w / 2 - 15, y + (int) h / 2);g.drawLine(lineX, 0, lineX, getHeight());g.drawLine(0, lineY, getWidth(), lineY);}public void drawRectangle(int x, int y, int width, int height) {this.x = x;this.y = y;h = height;w = width;repaint();}public void drawCross(int x, int y) {lineX = x;lineY = y;repaint();}int lineX, lineY;int x, y, h, w;}

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