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();

                }

            }

        }

    }

打水印 Imagename_biao是水印文件 ImgName是原图