java 添加水印

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.image.*;
import org.w3c.dom.*;
import com.sun.image.codec.jpeg.*;
import javax.imageio.*;

public class ImgBean{
public void ImgBean(){}
public void ImgYin(String s,String ImgName){
try{
File _file = new File(ImgName);
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="我要加的水印";
g.setColor(Color.RED);
g.setFont(new Font("宋体",Font.PLAIN,20));
Font aa=new Font("宋体",Font.PLAIN,20);

g.drawString(s,wideth-150,height-10);
g.dispose();
FileOutputStream out=new FileOutputStream(ImgName);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
}
catch(Exception e){
System.out.println(e);
}
}
}