java实现区域内屏幕截图示例

/* * 截图窗口 */class ScreenShotWindow extends JWindow{  private int orgx, orgy, endx, endy;    private BufferedImage image=null;    private BufferedImage tempImage=null;    private BufferedImage saveImage=null;    private ToolsWindow tools=null; public ScreenShotWindow() throws AWTException{   //获取屏幕尺寸   Dimension d = Toolkit.getDefaultToolkit().getScreenSize();   this.setBounds(0, 0, d.width, d.height);   //截取屏幕   Robot robot = new Robot();   image = robot.createScreenCapture(new Rectangle(0, 0, d.width,d.height));   this.addMouseListener(new MouseAdapter() {    @Override   public void mousePressed(MouseEvent e) {    //鼠标松开时记录结束点坐标，并隐藏操作窗口             orgx = e.getX();             orgy = e.getY();             if(tools!=null){              tools.setVisible(false);                  @Override   public void mouseReleased(MouseEvent e) {    //鼠标松开时，显示操作窗口    if(tools==null){     tools=new ToolsWindow(ScreenShotWindow.this,e.getX(),e.getY());   else{     tools.setLocation(e.getX(),e.getY());       tools.setVisible(true);    tools.toFront();   );   this.addMouseMotionListener(new MouseMotionAdapter() {   @Override   public void mouseDragged(MouseEvent e) {    //鼠标拖动时，记录坐标并重绘窗口                endx = e.getX();                endy = e.getY();                //临时图像，用于缓冲屏幕区域放置屏幕闪烁                Image tempImage2=createImage(ScreenShotWindow.this.getWidth(),ScreenShotWindow.this.getHeight());                Graphics g =tempImage2.getGraphics();                g.drawImage(tempImage, 0, 0, null);                int x = Math.min(orgx, endx);                int y = Math.min(orgy, endy);                int width = Math.abs(endx - orgx)+1;                int height = Math.abs(endy - orgy)+1;                // 加上1防止width或height0                g.setColor(Color.BLUE);                g.drawRect(x-1, y-1, width+1, height+1);                //减1加1都了防止图片矩形框覆盖掉                saveImage = image.getSubimage(x, y, width, height);                g.drawImage(saveImage, x, y, null);                ScreenShotWindow.this.getGraphics().drawImage(tempImage2,0,0,ScreenShotWindow.this);   );    @Override    public void paint(Graphics g) {        RescaleOp ro = new RescaleOp(0.8f, 0, null);        tempImage = ro.filter(image, null);        g.drawImage(tempImage, 0, 0, this);        //保存图像到文件 public void saveImage() throws IOException {  JFileChooser jfc=new JFileChooser();  jfc.setDialogTitle("保存");  //文件过滤器，用户过滤可选择文件  FileNameExtensionFilter filter = new FileNameExtensionFilter("JPG", "jpg");  jfc.setFileFilter(filter);  //初始化一个默认文件（此文件会生成到桌面上）  SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss");     String fileName = sdf.format(new Date());     File filePath = FileSystemView.getFileSystemView().getHomeDirectory();     File defaultFile = new File(filePath + File.separator + fileName + ".jpg");     jfc.setSelectedFile(defaultFile);  int flag = jfc.showSaveDialog(this);  if(flag==JFileChooser.APPROVE_OPTION){   File file=jfc.getSelectedFile();   String path=file.getPath();   //检查文件后缀，放置用户忘记输入后缀或者输入不正确的后缀   if(!(path.endsWith(".jpg")||path.endsWith(".JPG"))){    path+=".jpg";     //写入文件   ImageIO.write(saveImage,"jpg",new File(path));   System.exit(0); /* * 操作窗口 */class ToolsWindow extends JWindow{ private ScreenShotWindow parent; public ToolsWindow(ScreenShotWindow parent,int x,int y) {  this.parent=parent;  this.init();  this.setLocation(x, y);  this.pack();  this.setVisible(true); private void init(){  this.setLayout(new BorderLayout());  JToolBar toolBar=new JToolBar("Java 截图");  //保存按钮  JButton saveButton=new JButton(new ImageIcon("images/save.gif"));  saveButton.addActionListener(new ActionListener() {    @Override   public void actionPerformed(ActionEvent e) {    try {     parent.saveImage();    catch (IOException e1) {     e1.printStackTrace();      );  toolBar.add(saveButton);  //关闭按钮  JButton closeButton=new JButton(new ImageIcon("images/close.gif"));  closeButton.addActionListener(new ActionListener() {   @Override   public void actionPerformed(ActionEvent e) {    System.exit(0);   );  toolBar.add(closeButton);  this.add(toolBar,BorderLayout.NORTH);