java程序中如何给图片加水印

package com.langhua.ImageUtils;   
import java.awt.Color;       
import java.awt.Font;       
import java.awt.Graphics;       
import java.awt.Image;       
import java.awt.image.BufferedImage;       
import java.io.File;       
import java.io.FileOutputStream;       
       
import javax.imageio.ImageIO;       
       
import com.sun.image.codec.jpeg.JPEGCodec;       
import com.sun.image.codec.jpeg.JPEGImageEncoder;       
/**  
* 给图片加水印  
* @author iis  
*/      
public final class ImageUtils {       
     public ImageUtils() {       
       
     }   
     /**     
      * 把图片印刷到图片上     
      *      
      * @param pressImg  
      *            水印文件     
      * @param targetImg     
      *            目标文件     
      * @param x     
      * @param y     
      */      
     public final static void pressImage(String pressImg, String targetImg,       
             int x, int y) {       
         try {       
             File _file = new File(targetImg);       
             Image src = ImageIO.read(_file);       
             int wideth = src.getWidth(null);       
             int height = src.getHeight(null);       
             BufferedImage image = new BufferedImage(wideth, height,       
                     BufferedImage.TYPE_INT_RGB);       
             Graphics g = image.createGraphics();       
             g.drawImage(src, 0, 0, wideth, height, null);       
       
             // 水印文件       
             File _filebiao = new File(pressImg);       
             Image src_biao = ImageIO.read(_filebiao);       
             int wideth_biao = src_biao.getWidth(null);       
             int height_biao = src_biao.getHeight(null);       
             g.drawImage(src_biao, wideth - wideth_biao - x, height       
                     - height_biao - y, wideth_biao, height_biao, null);       
             // /       
             g.dispose();       
             FileOutputStream out = new FileOutputStream(targetImg);       
             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);       
             encoder.encode(image);       
             out.close();       
         } catch (Exception e) {       
             e.printStackTrace();       
         }       
     }       
       
     /**     
      * 打印文字水印图片     
      *      
      * @param pressText     
      *             --文字     
      * @param targetImg   
      *             --目标图片     
      * @param fontName   
      *             --字体名     
      * @param fontStyle   
      *             --字体样式     
      * @param color      
      *             --字体颜色     
      * @param fontSize      
      *             --字体大小     
      * @param x      
      *             --X偏移量     
      * @param y  
      *             --Y偏移量     
      */      
       
     public static void pressText(String pressText, String targetImg,       
             String fontName, int fontStyle, int color, int fontSize, int x,       
             int y) {       
         try {       
             File _file = new File(targetImg);       
             Image src = ImageIO.read(_file);       
             int wideth = src.getWidth(null);       
             int height = src.getHeight(null);       
             BufferedImage image = new BufferedImage(wideth, height,       
                     BufferedImage.TYPE_INT_RGB);       
             Graphics g = image.createGraphics();       
             g.drawImage(src, 0, 0, wideth, height, null);       
             // String s="www.qhd.com.cn";       
             g.setColor(Color.RED);       
             g.setFont(new Font(fontName, fontStyle, fontSize));       
       
             g.drawString(pressText,fontSize+x,fontSize       
                      +y);       
             g.dispose();       
             FileOutputStream out = new FileOutputStream(targetImg);       
             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);       
             encoder.encode(image);       
             out.close();       
         } catch (Exception e) {       
             System.out.println(e);       
         }       
     }       
       
     public static void main(String[] args) {       
         pressImage("d:/1.jpg", "d:/2.jpg", 20, 20);       
         pressText("水印文字", "d:/1.jpg","宋体",1,1,25,10, 10);   
     }       
}