用java写图片

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

public class Image {
public static void main(String[] args) throws FileNotFoundException, IOException{
    //得到图片缓冲区
    BufferedImage bi=new BufferedImage(150,70, BufferedImage.TYPE_INT_RGB);
    //得到画笔
    Graphics2D g2=(Graphics2D) bi.getGraphics();
    //填充背景
    g2.setColor(Color.WHITE);
    g2.fillRect(0, 0, 150, 70);
    //设置边框
    g2.setColor(Color.RED);
    g2.drawRect(0, 0, 149, 69);
    //向图片上写字符串
　　g2.setFont(new Font("宋体", Font.BOLD, 10));
   g2.setColor(Color.BLACK);
    g2.drawString("grup", 19, 20);
    ImageIO.write(bi, "JPEG", new FileOutputStream("f:/g.jpg"));
}
}