为什么这个代码保存出来的图片是一片空白

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package adventuregame; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class TestGame  { public void test() throws IOException { Image Img=Toolkit.getDefaultToolkit().createImage("e:/Map1.JPG"); BufferedImage img=new BufferedImage(10000,800,BufferedImage.TYPE_INT_RGB); Graphics g=img.getGraphics(); g.setColor(Color.white); g.fillRect(0, 0,10000,800); g.drawImage(Img, 0, 0,null); g.dispose(); ImageIO.write(img,"JPG",new File("e:/Map0.JPG")); } public static void main(String []args) throws IOException { TestGame tg=new TestGame(); tg.test(); } }