/**
 * 图像切割（指定切片的宽度和高度）
 * @param bi 原图像
 * @param x 裁剪原图像起点坐标X
 * @param y 裁剪原图像起点坐标Y
 * @param width 目标切片宽度
 * @param height 目标切片高度
 * @return
 */
public static BufferedImage cut(BufferedImage bi,int x, int y, int width, int height) {

    BufferedImage tag = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = tag.createGraphics();
    tag = g2.getDeviceConfiguration().createCompatibleImage(width, height,
            Transparency.TRANSLUCENT);
    g2.dispose();
    g2 = tag.createGraphics();

    int srcWidth = bi.getHeight(); // 源图宽度
    int srcHeight = bi.getWidth(); // 源图高度
    if (srcWidth > 0 && srcHeight > 0) {
        ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
        Image img = Toolkit.getDefaultToolkit().createImage(
                new FilteredImageSource(bi.getSource(),cropFilter));
        g2.drawImage(img, 0, 0, width, height, null); // 绘制切割后的图
        g2.dispose();
    }
    return tag;
}
 

/**
 * 图像切割(按指定起点坐标和宽高切割)
 * @param srcImg 源图像地址
 * @param outImg 切片后的图像地址
 * @param x 目标切片起点坐标X
 * @param y 目标切片起点坐标Y
 * @param width 目标切片宽度
 * @param height 目标切片高度
 * @param imageType 图片类型
 */
public static void cut(File srcImg, File outImg, int x, int y, int width, int height,String imageType) throws Exception{
	//读取源图像
	BufferedImage bi = ImageIO.read(srcImg);
	int srcWidth = bi.getHeight();//源图宽度
	int srcHeight = bi.getWidth();//源图高度
	if (srcWidth > 0 && srcHeight > 0) {
		Image image = bi.getScaledInstance(srcWidth, srcHeight,Image.SCALE_DEFAULT);
		//四个参数分别为图像起点坐标和宽高
		//即:CropImageFilter(int x,int y,int width,int height)
		ImageFilter cropFilter = new CropImageFilter(x, y, width,height);
		Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
		BufferedImage tag = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
		Graphics g = tag.getGraphics();
		g.drawImage(img, 0, 0, width, height, null);//绘制切割后的图
		g.dispose();
		//输出为文件
		ImageIO.write(tag, imageType, outImg);
	}
}
 

/**
 * 图像切割(按指定起点坐标和宽高切割)
 * @param srcImageFile 源图像地址
 * @param result 切片后的图像地址
 * @param x 目标切片起点坐标X
 * @param y 目标切片起点坐标Y
 * @param width 目标切片宽度
 * @param height 目标切片高度
 */
public final static void cut(String srcImageFile, String result,
        int x, int y, int width, int height) {
    try {
        // 读取源图像
        BufferedImage bi = ImageIO.read(new File(srcImageFile));
        int srcWidth = bi.getHeight(); // 源图宽度
        int srcHeight = bi.getWidth(); // 源图高度
        if (srcWidth > 0 && srcHeight > 0) {
            Image image = bi.getScaledInstance(srcWidth, srcHeight,
                    Image.SCALE_DEFAULT);
            // 四个参数分别为图像起点坐标和宽高
            // 即: CropImageFilter(int x,int y,int width,int height)
            ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
            Image img = Toolkit.getDefaultToolkit().createImage(
                    new FilteredImageSource(image.getSource(),
                            cropFilter));
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(img, 0, 0, width, height, null); // 绘制切割后的图
            g.dispose();
            // 输出为文件
            ImageIO.write(tag, "JPEG", new File(result));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

public static void main (String[] args) {
    new CropImageFilter(20, 20, 40, 50).clone();
}