JAVA实现屏幕抓图 远程桌面控制

    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 main

    public 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 Pattern

    public 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)

    **/

    @Deprecated

    public 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 pattern

    private 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;

    }
 

 

http://www.hackbase.com/tech/2010-08-03/60958_2.html