Java屏幕截圖工具 捕獲屏幕

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;
/**

捕獲屏幕，屏幕截圖工具
*/
public class ScreenCaptureFrame extends JFrame implements ActionListener {
private ScreenCaptureUtil scrCaptureUtil = null;// 捕獲屏幕的工具類
 private PaintCanvas canvas = null;// 畫布，用于畫捕獲到的屏幕圖像
public ScreenCaptureFrame() {

 super("Screen Capture");
 init();

}
/**

初始化
*/
private void init() {
scrCaptureUtil = new ScreenCaptureUtil();// 創建抓屏工具
 canvas = new PaintCanvas(scrCaptureUtil);// 創建畫布
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) {// 點擊“抓屏”按鈕時，在畫布上畫屏幕圖像
 canvas.drawScreen();
}
public static void main(String[] args) {
 new ScreenCaptureFrame();
}
}




/**

抓屏工具類
*/
class ScreenCaptureUtil {
 private Robot robot = null;// 抓屏的主要工具類
 private Rectangle scrRect = null;// 屏幕的矩形圖像
public ScreenCaptureUtil() {

 try {
     robot = new Robot();// 創建一個抓屏工具
 } catch (Exception ex) {
     System.out.println(ex.toString());
 }
 // 獲取屏幕的矩形圖像
 Dimension scrSize = Toolkit.getDefaultToolkit().getScreenSize();
 scrRect = new Rectangle(0, 0, scrSize.width, scrSize.height);

}
/**

抓屏方法

@return 返回一個圖像
*/
public BufferedImage captureScreen() {
 BufferedImage scrImg = null;
 try {
 scrImg = robot.createScreenCapture(scrRect);// 抓的是全屏圖

 } catch (Exception e) {
 System.out.println(e.toString());

 }
 return scrImg;
}
}



/**

畫布類，用于顯示抓屏得到的圖像
*/
class PaintCanvas extends JPanel {
 private ScreenCaptureUtil scrCaptureUtil = null;// 抓屏工具
 private BufferedImage scrImg = null;// 待畫的圖像　
public PaintCanvas(ScreenCaptureUtil screenUtil) {

 this.scrCaptureUtil = screenUtil;

}
/**

重載JPanel的paintComponent，用于畫背景
*/
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);

}
}
/**

畫屏幕圖像的方法
*/
public void drawScreen() {
 Graphics g = this.getGraphics();
 scrImg = scrCaptureUtil.captureScreen();// 抓屏，獲取屏幕圖像
 if (scrImg != null) {
 this.paintComponent(g);// 畫圖

 }
 g.dispose();// 釋放資源
}



}</pre>