JTabbedPane添加关闭按钮和缩略图 .

直接实例化就可以使用，一些swing控件的改进的：

/** [e-mail]* */package exec;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.awt.geom.AffineTransform;import java.util.ArrayList;import java.util.HashMap;/*** A JTabbedPane which has a close ('X') icon on each tab.* To add a tab, use the method addTab(String, Component)* To have an extra icon on each tab (e.g. like in JBuilder,* showing the file type) use the method* addTab(String, Component, Icon).* Only clicking the 'X' closes the tab. */public class JClosableTabbedPane extends JTabbedPane implements MouseListener {    private double scaleRatio = 0.3;    private HashMap<String, Component> maps = new HashMap<String, Component>();    public JClosableTabbedPane() {        super();        addMouseListener(this);    }    public void addTab(String title, Component component) {        this.addTab(title, component, null);    }    public void addTab(String title, Component component, Icon extraIcon) {        super.addTab(title, new CloseTabIcon(extraIcon), component);    }    public void insertTab(String title, Icon icon, Component component, String tip, int index) {        tip = "tab" + component.hashCode();        maps.put(tip, component);        super.insertTab(title, icon, component, tip, index);    }    public void removeTabAt(int index) {        Component component = getComponentAt(index);        maps.remove("tab" + component.hashCode());        super.removeTabAt(index);    }    public JToolTip createToolTip() {        ImageToolTip tooltip = new ImageToolTip();        tooltip.setComponent(this);        return tooltip;    }    class ImageToolTip extends JToolTip {        public Dimension getPreferredSize() {            String tip = getTipText();            Component component = maps.get(tip);            if (component != null) {                return new Dimension((int) (getScaleRatio() * component.getWidth()), (int) (getScaleRatio() * component.getHeight()));            } else {                return super.getPreferredSize();            }        }        public void paintComponent(Graphics g) {            String tip = getTipText();            Component component = maps.get(tip);            if (component instanceof JComponent) {                JComponent jcomponent = (JComponent) component;                Graphics2D g2d = (Graphics2D) g;                AffineTransform at = g2d.getTransform();                g2d.transform(AffineTransform.getScaleInstance(getScaleRatio(), getScaleRatio()));                ArrayList<JComponent> dbcomponents = new ArrayList<JComponent>();                updateDoubleBuffered(jcomponent, dbcomponents);                jcomponent.paint(g);                resetDoubleBuffered(dbcomponents);                g2d.setTransform(at);            }        }        private void updateDoubleBuffered(JComponent component, ArrayList<JComponent> dbcomponents) {            if (component.isDoubleBuffered()) {                dbcomponents.add(component);                component.setDoubleBuffered(false);            }            for (int i = 0; i < component.getComponentCount(); i++) {                Component c = component.getComponent(i);                if (c instanceof JComponent) {                    updateDoubleBuffered((JComponent) c, dbcomponents);                }            }        }        private void resetDoubleBuffered(ArrayList<JComponent> dbcomponents) {            for (JComponent component : dbcomponents) {                component.setDoubleBuffered(true);            }        }    }    public double getScaleRatio() {        return scaleRatio;    }    public void setScaleRatio(double scaleRatio) {        this.scaleRatio = scaleRatio;    }    public void mouseClicked(MouseEvent e) {        int tabNumber = getUI().tabForCoordinate(this, e.getX(), e.getY());        if (tabNumber < 0) {            return;        }        Rectangle rect = ((CloseTabIcon) getIconAt(tabNumber)).getBounds();        if (rect.contains(e.getX(), e.getY())) {            //the tab is being closed            this.removeTabAt(tabNumber);        }    }    public void mouseEntered(MouseEvent e) {    }    public void mouseExited(MouseEvent e) {    }    public void mousePressed(MouseEvent e) {    }    public void mouseReleased(MouseEvent e) {    }}/*** The class which generates the 'X' icon for the tabs. The constructor* accepts an icon which is extra to the 'X' icon, so you can have tabs* like in JBuilder. This value is null if no extra icon is required.*/class CloseTabIcon implements Icon {    private int x_pos;    private int y_pos;    private int width;    private int height;    private Icon fileIcon;    public CloseTabIcon(Icon fileIcon) {        this.fileIcon = fileIcon;        width = 16;        height = 16;    }    public void paintIcon(Component c, Graphics g, int x, int y) {        this.x_pos = x;        this.y_pos = y;        Color col = g.getColor();        g.setColor(Color.black);        int y_p = y + 2;        g.drawLine(x + 1, y_p, x + 12, y_p);        g.drawLine(x + 1, y_p + 13, x + 12, y_p + 13);        g.drawLine(x, y_p + 1, x, y_p + 12);        g.drawLine(x + 13, y_p + 1, x + 13, y_p + 12);        g.drawLine(x + 3, y_p + 3, x + 10, y_p + 10);        g.drawLine(x + 3, y_p + 4, x + 9, y_p + 10);        g.drawLine(x + 4, y_p + 3, x + 10, y_p + 9);        g.drawLine(x + 10, y_p + 3, x + 3, y_p + 10);        g.drawLine(x + 10, y_p + 4, x + 4, y_p + 10);        g.drawLine(x + 9, y_p + 3, x + 3, y_p + 9);        g.setColor(col);        if (fileIcon != null) {            fileIcon.paintIcon(c, g, x + width, y_p);        }    }    public int getIconWidth() {        return width + (fileIcon != null ? fileIcon.getIconWidth() : 0);    }    public int getIconHeight() {        return height;    }    public Rectangle getBounds() {        return new Rectangle(x_pos, y_pos, width, height);    }    /*public static void main(String args[]) {    try {    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());    }    catch (Exception e) {    e.printStackTrace();    }    JClosableTabbedPane pane = new JClosableTabbedPane();    ImageIcon icon = new ImageIcon("images/middle.jpg");    pane.addTab("tab1",new JButton("first Button"),icon);    pane.addTab("tab2",new JButton("sec Button"),icon);    pane.addTab("tab3",new JButton("third Button"),icon);    pane.addTab("tab4",new JButton("fourth Button"),icon);    JFrame frame = new JFrame("Demo");    frame.getContentPane().add(pane,BorderLayout.CENTER);    frame.setSize(500,300);    frame.setLocation(300,200);    frame.show();    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }*/}