打水印 Imagename_biao是水印文件 ImgName是原图

/**
     * 打水印  Imagename_biao是水印文件  ImgName是原图
     * @param Imagename_biao
     * @param ImgName
     */
    public static void imgYin(String Imagename_biao, String ImgName) {
        //System.out.println("11111111111111111111111111111111 inin");  
        FileImageOutputStream out=null;
        File _file=null;
        BufferedImage image=null;
        File _filebiao=null;
        try {
              _file = new File(ImgName);
            Image src = ImageIO.read(_file);
            int wideth = src.getWidth(null);
            int height = src.getHeight(null);
            
            //宽大于300才打水印
            if (wideth > 300) {
                  image = new BufferedImage(wideth, height,
                        BufferedImage.TYPE_INT_RGB);
                Graphics g = image.createGraphics();
                g.drawImage(src, 0, 0, wideth, height, null);
                // g.drawImage(src.getScaledInstance(wideth,
                // height,Image.SCALE_SMOOTH), 0, 0,wideth, height, null);

                // 水印文件
                  _filebiao = new File(Imagename_biao);
                Image src_biao = ImageIO.read(_filebiao); 
                int wideth_biao = src_biao.getWidth(null);
                int height_biao = src_biao.getHeight(null);
                // 水印文件显示在中央
                g.drawImage(src_biao, (int) (0.5 * (wideth - wideth_biao)),
                        (int) (0.5 * (height - height_biao)), wideth_biao,
                        height_biao, null);
                // g.drawImage(src_biao.getScaledInstance(wideth_biao,
                // height_biao,Image.SCALE_SMOOTH), (int)(0.5*(wideth
                // -wideth_biao)) , (int)(0.5*(height -height_biao)),
                // wideth_biao,
                // height_biao, null);
                // 水印文件在原图片文件的位置，原图片文件的右下角为wideth-0,height-0
                g.dispose();
                // FileOutputStream out = new FileOutputStream(ImgName);
                // JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
                // JPEGEncodeParam param =
                // encoder.getDefaultJPEGEncodeParam(image);
                // param.setQuality(0.9f, false); //不压缩图像fals
                // encoder.setJPEGEncodeParam(param);
                // encoder.encode(image);
                // out.flush();
                // out.close();

                // ImageIO.write(image, "jpg", new File(ImgName));

                Iterator<ImageWriter> iter = ImageIO
                        .getImageWritersByFormatName("jpg");
                if (iter.hasNext()) {
                    ImageWriter writer = iter.next();
                    ImageWriteParam param = writer.getDefaultWriteParam();

                    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);  //MODE_COPY_FROM_METADATA  ,MODE_EXPLICIT
                    param.setCompressionQuality(0.9f);
                    //System.out.println("Quality:"+1.0);
                    out = new FileImageOutputStream(
                            new File(ImgName));
                    writer.setOutput(out);
                    // writer.write(bi);
                    writer.write(null, new IIOImage(image, null, null), param);
                    out.close();
                    writer.dispose();
                    
                }
             
            }
            
        } catch (Exception e) {
            System.out.println(e);
            e.printStackTrace();
        }finally{
               
            
            if(out!=null){
                try 
                { 
                    out.close();
                } catch (Exception e) {
                    //e.printStackTrace();
                }
            }
        }
    }