import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.FileOutputStream;

import javax.swing.ImageIcon;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGEncodeParam;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class WaterMark {

     /**

      * 给图片添加水印

      *

      * @param filePath

      *             需要添加水印的图片的路径

      * @param markContent

      *             水印的文字

      * @param markContentColor

      *             水印文字的颜色

      * @param qualNum

      *             图片质量

      * @return

      */

     public void createMark(String filePath, String markContent,

             Color markContentColor, float qualNum) {

         ImageIcon imgIcon = new ImageIcon(filePath);

         Image theImg = imgIcon.getImage();

         int width = theImg.getWidth(null);

         int height = theImg.getHeight(null);

         BufferedImage bimage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);

         Graphics2D g = bimage.createGraphics();

         g.setColor(markContentColor);

         g.setBackground(Color.white);

         g.drawImage(theImg, 0, 0, null);

         g.drawString(markContent, width / 3, height / 2); // 添加水印的文字和设置水印文字出现的内容

         g.dispose();

         try {

             FileOutputStream out = new FileOutputStream(filePath);

             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

             JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);

             param.setQuality(qualNum, true);

             encoder.encode(bimage, param);

             out.close();

         } catch (Exception e) {

             return ;

         }

     }

     public static void main(String[] args) {

         WaterMark wm = new WaterMark();

         wm.createMark("d://map.jpg","http://www.90che.com",Color.WHITE,70f);

     }

}