Graphics2D设置背景色

package test;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class DrawGraphics {

?/**
? * @param args
? */
?public static void main(String[] args) throws Exception{
??int width=800;
??int height=800;??
??File file = new File("C:/image.jpeg");
??BufferedImage bi = new BufferedImage(width, height,
????BufferedImage.TYPE_INT_RGB);//RGB形式
??Graphics2D g2 = (Graphics2D) bi.getGraphics();
??g2.setBackground(Color.WHITE);//设置背景色
??g2.clearRect(0, 0, width, height);//通过使用当前绘图表面的背景色进行填充来清除指定的矩形。
??g2.setPaint(Color.BLUE);//设置画笔,设置Paint属性
??g2.drawOval(0, 0, 80, 80);
??ImageIO.write(bi, "jpeg", file);
??g2.dispose();
??System.out.println("test");

?}

}