Java如何捕获当前屏幕图像
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package com.borland.samples.welcome;
/**
* Title:
*
Description:
* Copyright: Copyright (c) 2001
* Company:
* @author
*
@version 1.0
*/
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();
}
}
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