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口袋猫 把此帖设为精华，作者+50经验：精品文章
 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.*;
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author by http://www.5a520.cn
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  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 ，来源http://www.bt285.cn BT下载";
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);
}
}
 }
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