给图片添加水印效果！

 /*
 * 创建日期 2006-5-10
 * 创建人 rayYoung
 */
package test.pmark;

import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;

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

public class WaterMark {

 public void imgMark(String strOriginalFileName, String strWaterMarkFileName,String strNewFileName) {
  try {
   // 源文件
   File fileOriginal = new File(strOriginalFileName);
   Image imageOriginal = ImageIO.read(fileOriginal);
   int widthOriginal = imageOriginal.getWidth(null);
   int heightOriginal = imageOriginal.getHeight(null);
   System.out.println("widthOriginal:" + widthOriginal
     + "theightOriginal:" + heightOriginal);

   BufferedImage bufImage = new BufferedImage(widthOriginal,
     heightOriginal, BufferedImage.TYPE_INT_RGB);
   Graphics g = bufImage.createGraphics();
   g.drawImage(imageOriginal, 0, 0, widthOriginal, heightOriginal,
     null);

   // 水印文件
   File fileWaterMark = new File(strWaterMarkFileName);
   Image imageWaterMark = ImageIO.read(fileWaterMark);
   int widthWaterMark = imageWaterMark.getWidth(null);
   int heightWaterMark = imageWaterMark.getHeight(null);
   System.out.println("widthWaterMark:" + widthWaterMark
     + "theightWaterMark:" + heightWaterMark);

   // 水印文件在源文件的右下角
   g.drawImage(imageWaterMark, widthOriginal - widthWaterMark,
     heightOriginal - heightWaterMark, widthWaterMark,
     heightWaterMark, null);
   g.dispose();

   FileOutputStream fos = new FileOutputStream(strNewFileName);
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
   encoder.encode(bufImage);
   fos.flush();
   fos.close();
   fos = null;
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 public static void main(String[] args) {
  WaterMark waterMark = new WaterMark();
  String mainImg = "E:eclips3.0-workspacetesttestmain.jpg";    //原图片
  String subImg = "E:eclips3.0-workspacetesttestsub.jpg";    //需要加载的图片
  String newImg = "E:eclips3.0-workspacetesttestnew.jpg";    //生成后的图片

  if (mainImg != null && !mainImg.endsWith("")) {
      waterMark.imgMark(args[0],args[1]);
      waterMark.imgMark(mainImg, subImg,newImg);
  } else {
      System.out.println("Java WaterMark fileOriginal fileWaterMark");
  }
 }

}

本文来源：http://blog.csdn.net/ray_1981/archive/2007/08/31/1767664.aspx