图片水印

package tiany.demo;
 

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 <a href="mailto:mhmyqn@qq.com">mumaoqiang</a></br> 
 * @Date 2012-7-19 下午10:27:54 </br> 
 * @FullName com.mmq.watermark.WaterMarkUtils.java </br> 
 * @JDK 1.6.0 </br> 
 * @Version 1.0 </br> 
 */  
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);  
            System.out.println("srcImgFile=="+srcImgFile);
            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:/2.png", "d:/1.jpg", Color.red, "水印效果测试");  
   }  
}