主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。package com.qiu.util;import java.io.*;import java.net.*;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.awt.image.*;import javax.imageio.*;import java.io.*;/**@Author Qiu_BaiChao*一个简单的屏幕抓图***/public class ScreenCapture {//test mainpublic static void main(String[] args) throws Exception{String userdir = System.getProperty("user.dir");File tempFile = new File("d:","temp.png");ScreenCapture capture = ScreenCapture.getInstance();capture.captureImage();JFrame frame = new JFrame();JPanel panel = new JPanel();panel.setLayout(new BorderLayout());JLabel imagebox = new JLabel();panel.add(BorderLayout.CENTER,imagebox);imagebox.setIcon(capture.getPickedIcon());capture.saveToFile(tempFile);capture.captureImage();imagebox.setIcon(capture.getPickedIcon());frame.setContentPane(panel);frame.setSize(400,300);frame.show();System.out.println("Over");}private ScreenCapture() {try{robot = new Robot();}catch(AWTException e) {System.err.println("Internal Error: " + e);e.printStackTrace();}JPanel cp = (JPanel)dialog.getContentPane();cp.setLayout(new BorderLayout());labFullScreenImage.addMouseListener(new MouseAdapter() {public void mouseReleased(MouseEvent evn) {isFirstPoint = true;pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);dialog.setVisible(false);}});labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {public void mouseDragged(MouseEvent evn) {if(isFirstPoint) {x1 = evn.getX();y1 = evn.getY();isFirstPoint = false;}else {x2 = evn.getX();y2 = evn.getY();int maxX = Math.max(x1,x2);int maxY = Math.max(y1,y2);int minX = Math.min(x1,x2);int minY = Math.min(y1,y2);recX = minX;recY = minY;recW = maxX-minX;recH = maxY-minY;labFullScreenImage.drawRectangle(recX,recY,recW,recH);}}public void mouseMoved(MouseEvent e) {labFullScreenImage.drawCross(e.getX(),e.getY());}});cp.add(BorderLayout.CENTER,labFullScreenImage);dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));dialog.setAlwaysOnTop(true);dialog.setMaximumSize(Toolkit.getDefaultToolkit().getScreenSize());dialog.setUndecorated(true);dialog.setSize(dialog.getMaximumSize());dialog.setModal(true);}//Singleton Patternpublic static ScreenCapture getInstance() {return defaultCapturer;}/**捕捉全屏慕*/public Icon captureFullScreen() {fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));ImageIcon icon = new ImageIcon(fullScreenImage);return icon;}/**捕捉屏幕的一个矫形区域*/public void captureImage() {fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));ImageIcon icon = new ImageIcon(fullScreenImage);labFullScreenImage.setIcon(icon);dialog.setVisible(true);}/**得到捕捉后的BufferedImage*/public BufferedImage getPickedImage() {return pickedImage;}/**得到捕捉后的Icon*/public ImageIcon getPickedIcon() {return new ImageIcon(getPickedImage());}/**储存为一个文件,为PNG格式*@deprecated*replaced by saveAsPNG(File file)**/@Deprecatedpublic void saveToFile(File file) throws IOException{ImageIO.write(getPickedImage(),defaultImageFormater,file);}/**储存为一个文件,为PNG格式*/public void saveAsPNG(File file) throws IOException {ImageIO.write(getPickedImage(),"png",file);}/**储存为一个JPEG格式图像文件*/public void saveAsJPEG(File file) throws IOException {ImageIO.write(getPickedImage(),"JPEG",file);}/**写入一个OutputStream*/public void write(OutputStream out) throws IOException{ImageIO.write(getPickedImage(),defaultImageFormater,out);}//singleton design patternprivate static ScreenCapture defaultCapturer = new ScreenCapture();private int x1,y1,x2,y2;private int recX,recY,recH,recW; //截取的图像private boolean isFirstPoint = true;private BackgroundImage labFullScreenImage = new BackgroundImage();private Robot robot;private BufferedImage fullScreenImage;private BufferedImage pickedImage;private String defaultImageFormater = "png";private JDialog dialog = new JDialog();}/**显示图片的Label*/class BackgroundImage extends JLabel{public void paintComponent(Graphics g) {super.paintComponent(g);g.drawRect(x,y,w,h);String area = Integer.toString(w)+" * "+ Integer.toString(h);g.drawString(area,x+(int)w/2-15,y+(int)h/2);g.drawLine(lineX,0,lineX,getHeight());g.drawLine(0,lineY,getWidth(),lineY);}public void drawRectangle(int x,int y,int width,int height) {this.x = x;this.y = y;h = height;w = width;repaint();}public void drawCross(int x,int y) {lineX = x;lineY = y;repaint();}int lineX,lineY;int x,y,h,w;}
