java给图片加水印代码

try {
			String targetImg = "D:/Blue hills.jpg";
//			String pressImg = "D:/20130311220300.jpg";
			String pressImg = "D:/html_original.jpg";
			
			File f1 = new File(targetImg);
			Image src = ImageIO.read(f1);
			int width = src.getWidth(null);
			int height = src.getHeight(null);
			
			BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
			Graphics g =  image.createGraphics();
			g.drawImage(src, 0, 0, width, height, null);
			
			File f2 = new File(pressImg);
			Image src_pao = ImageIO.read(f2);
			int width_pao = src_pao.getWidth(null);
			int height_pao = src_pao.getHeight(null);
			g.drawImage(src_pao, (width-+width_pao)/2, (height-height_pao)/2,width_pao,height_pao, null);
//			g.drawImage(src_pao, 100, 100,width,height, null);
			
			g.dispose();
			FileOutputStream out = new FileOutputStream(targetImg);
			JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
			encoder.encode(image);
			out.close();
			System.out.println("水印添加成功!!");
			
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("水印添加失败!!");
			e.printStackTrace();
		}