水印

import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class SUIyin {

 public static void main(String[] args) throws IOException {
  BufferedImage i= ImageIO.read(new File("D:\\src\\timg[5].jpg"));
  Graphics g = i.getGraphics();
  
  g.setFont(new Font("微软雅黑",Font.BOLD,50));
  g.drawString("王昭君", 40,160);
  g.dispose();
  ImageIO.write(i,"jpg",new File("D:\\src\\timg[5].jpg"));

 }

}

運行結果