/**
   * 指定屏幕区域截图，返回截图的BufferedImage对象
   * @param x
   * @param y
   * @param width
   * @param height
   * @return 
   */
   public BufferedImage getScreenShot(int x, int y, int width, int height) {
    BufferedImage bfImage = null;
    try {
      Robot robot = new Robot();
      bfImage = robot.createScreenCapture(new Rectangle(x, y, width, height));
    } catch (AWTException e) {
      e.printStackTrace();
    }
    return bfImage;
  }

   /**
   * 指定屏幕区域截图，保存到指定目录
   * @param x
   * @param y
   * @param width
   * @param height
   * @param savePath - 文件保存路径
   * @param fileName - 文件保存名称
   * @param format - 文件格式
   */
  public void screenShotAsFile(int x, int y, int width, int height, String savePath, String fileName, String format) {
    try {
      Robot robot = new Robot();
      BufferedImage bfImage = robot.createScreenCapture(new Rectangle(x, y, width, height));
      File path = new File(savePath);
      File file = new File(path, fileName+ "." + format);
      ImageIO.write(bfImage, format, file);
    } catch (AWTException e) {
      e.printStackTrace();  
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

   /**
   * BufferedImage图片剪裁
   * @param srcBfImg - 被剪裁的BufferedImage
   * @param x - 左上角剪裁点X坐标
   * @param y - 左上角剪裁点Y坐标
   * @param width - 剪裁出的图片的宽度
   * @param height - 剪裁出的图片的高度
   * @return 剪裁得到的BufferedImage
   */
  public BufferedImage cutBufferedImage(BufferedImage srcBfImg, int x, int y, int width, int height) {
    BufferedImage cutedImage = null;
    CropImageFilter cropFilter = new CropImageFilter(x, y, width, height); 
    Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(srcBfImg.getSource(), cropFilter)); 
    cutedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
    Graphics g = cutedImage.getGraphics(); 
    g.drawImage(img, 0, 0, null); 
    g.dispose(); 
    return cutedImage;
  }