import java.awt.BorderLayout;  import java.awt.Container;  import java.awt.Dimension;  import java.awt.Graphics;  import java.awt.Rectangle;  import java.awt.Robot;  import java.awt.Toolkit;  import java.awt.event.ActionEvent;  import java.awt.event.ActionListener;  import java.awt.image.BufferedImage;    import javax.swing.JButton;  import javax.swing.JFrame;  import javax.swing.JPanel;  import javax.swing.WindowConstants;    /**   * 捕获屏幕，屏幕截图工具   */  public class ScreenCaptureFrame extends JFrame implements ActionListener {     private ScreenCaptureUtil scrCaptureUtil = null;// 捕获屏幕的工具类   private PaintCanvas canvas = null;// 画布，用于画捕获到的屏幕图像     public ScreenCaptureFrame() {    super("Screen Capture");    init();   }     /**    * 初始化    */   private void init() {      scrCaptureUtil = new ScreenCaptureUtil();// 创建抓屏工具    canvas = new PaintCanvas(scrCaptureUtil);// 创建画布      Container c = this.getContentPane();    c.setLayout(new BorderLayout());    c.add(canvas, BorderLayout.CENTER);      JButton capButton = new JButton("抓 屏");    c.add(capButton, BorderLayout.SOUTH);    capButton.addActionListener(this);    this.setSize(400, 400);    this.setVisible(true);    this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);   }     public void actionPerformed(ActionEvent e) {// 点击“抓屏”按钮时，在画布上画屏幕图像    canvas.drawScreen();   }     public static void main(String[] args) {    new ScreenCaptureFrame();   }  }    /**   * 抓屏工具类   */  class ScreenCaptureUtil {   private Robot robot = null;// 抓屏的主要工具类   private Rectangle scrRect = null;// 屏幕的矩形图像     public ScreenCaptureUtil() {    try {     robot = new Robot();// 创建一个抓屏工具    } catch (Exception ex) {     System.out.println(ex.toString());    }    // 获取屏幕的矩形图像    Dimension scrSize = Toolkit.getDefaultToolkit().getScreenSize();    scrRect = new Rectangle(0, 0, scrSize.width, scrSize.height);   }     /**    * 抓屏方法    *     * @return 返回一个图像    */   public BufferedImage captureScreen() {    BufferedImage scrImg = null;    try {     scrImg = robot.createScreenCapture(scrRect);// 抓的是全屏图    } catch (Exception e) {     System.out.println(e.toString());    }    return scrImg;   }  }    /**   * 画布类，用于显示抓屏得到的图像   */  class PaintCanvas extends JPanel {   private ScreenCaptureUtil scrCaptureUtil = null;// 抓屏工具   private BufferedImage scrImg = null;// 待画的图像　     public PaintCanvas(ScreenCaptureUtil screenUtil) {    this.scrCaptureUtil = screenUtil;   }     /**    * 重载JPanel的paintComponent，用于画背景    */   protected void paintComponent(Graphics g) {    if (scrImg != null) {     int iWidth = this.getWidth();     int iHeight = this.getHeight();     g.drawImage(scrImg, 0, 0, iWidth, iHeight, 0, 0, scrImg.getWidth(),       scrImg.getHeight(), null);    }   }     /**    * 画屏幕图像的方法    */   public void drawScreen() {    Graphics g = this.getGraphics();    scrImg = scrCaptureUtil.captureScreen();// 抓屏，获取屏幕图像    if (scrImg != null) {     this.paintComponent(g);// 画图    }    g.dispose();// 释放资源   }    }