java给图片添加水印文字

 package com.mmq.watermark;

 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics2D;
 import java.awt.Image;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.FileOutputStream;

 import javax.imageio.ImageIO;

 /**
  *
  * @use java给图片添加水印文字
  * @ProjectName stuff
  * @Author mumaoqiang
  * @Date 2012-7-19 下午10:27:54
  * @FullName com.mmq.watermark.WaterMarkUtils.java
  * @JDK 1.6.0
  * @Version 1.0
  */
 public class WaterMarkUtils {
     /**
      * 图片添加水印
      * @param srcImgPath 需要添加水印的图片的路径
      * @param outImgPath 添加水印后图片输出路径
      * @param markContentColor 水印文字的颜色
      * @param waterMarkContent 水印的文字
      */
     public void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) {
         try {
             // 读取原图片信息
             File srcImgFile = new File(srcImgPath);
             Image srcImg = ImageIO.read(srcImgFile);
             int srcImgWidth = srcImg.getWidth(null);
             int srcImgHeight = srcImg.getHeight(null);
             // 加水印
             BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
             Graphics2D g = bufImg.createGraphics();
             g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
             //Font font = new Font("Courier New", Font.PLAIN, 12);
             Font font = new Font("宋体", Font.PLAIN, 50);
             g.setColor(markContentColor); //根据图片的背景设置水印颜色

             g.setFont(font);
             int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3;
             int y = srcImgHeight - 3;
             //int x = (srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2;
             //int y = srcImgHeight / 2;
             g.drawString(waterMarkContent, x, y);
             g.dispose();
             // 输出图片
             FileOutputStream outImgStream = new FileOutputStream(outImgPath);
             ImageIO.write(bufImg, "jpg", outImgStream);
             outImgStream.flush();
             outImgStream.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      * 获取水印文字总长度
      * @param waterMarkContent 水印的文字
      * @param g
      * @return 水印文字总长度
      */
     public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
         return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
     }

     public static void main(String[] args) {
         // 原图位置, 输出图片位置, 水印文字颜色, 水印文字
         new WaterMarkUtils().mark("d:/postWatermark.jpg", "d:/afterWatermark.jpg", Color.red, "水印效果测试");
    }
 }