Java捕獲當前屏幕圖像

作者：未知????文章來源：www.jspcn.net

發布日期：2005年01月19日

網友：緣來如此 提供

import java.awt.*;

import java.awt.image.*;

import com.sun.image.codec.jpeg.*;

class ImageCanvas extends Canvas{

private Image image;

private Dimension prefSize;

public ImageCanvas(Image image){

this.image = image;

calculatePreferredSize();

}

public void setImage(Image image){

this.image = image;

calculatePreferredSize();

repaint();

}

private void calculatePreferredSize(){

prefSize = new Dimension(image.getWidth(this),image.getHeight(this));

System.out.println(image.getWidth(this));

setSize(prefSize);

}

public Dimension getPreferredSize() {

return prefSize;

}

public Dimension getMinimumSize() {

return prefSize;

}

public void update(Graphics g){

paint(g);

}

public void paint(Graphics g){

g.drawImage(image,0,0,null);

}

}

class ImageUtils{

public static Image getScreenImage(){

Robot robot;

try {

robot = new Robot();

}catch(Exception e) {

throw new RuntimeException("unable to construct Robot");

}

Dimension screenDims =Toolkit.getDefaultToolkit().getScreenSize();

Image screen =robot.createScreenCapture(new Rectangle(450,350,screenDims.width,screenDims.height)).getScaledInstance(400,300,Image.SCALE_SMOOTH);

MediaTracker tracker =new MediaTracker(new Label());

tracker.addImage(screen,1);

try {

tracker.waitForID(0);

}catch(InterruptedException e) { /** ... */ }

return screen;

}

}

public class ScreenCapture extends Frame{

private ImageCanvas canvas =new ImageCanvas(ImageUtils.getScreenImage());

public ScreenCapture(){

add(canvas);

setSize(400,300);

setVisible(true);

Thread imageThread =new UpdateThread();

imageThread.setDaemon(true);

imageThread.start();

}

class UpdateThread extends Thread{

public void run(){

while(true){

try {

Thread.currentThread().sleep(1000);

}

catch (Exception ex) {

}

canvas.setImage(ImageUtils.getScreenImage());

validate();

}

}

}

public static void main(String[] args){

new ScreenCapture();

}

}

總結

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