简单问题：为什么在JAPNEL上画背景图，图片闪了一下就消失了

[zlmlczcmlvsaav]

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class shizhong extends JPanel
{ private static Graphics g;
public shizhong() throws IOException //throws IOException
{
}

public static void main(String args[]) throws IOException
{
shizhong s=new shizhong();
s.shizz();
JFrame jj=new JFrame();

jj.getContentPane().add(s,BorderLayout.CENTER);

jj.setSize(300,300);


jj.setVisible(true);
}
public void shizz() throws IOException
{
g=getGraphics();;

}

public void paintComponent(Graphics g)
{

File file=new File("image/shizhong.png");



BufferedImage bi = null;
try {
bi = ImageIO.read(file);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Image im=(Image)bi;

g=this.getGraphics();
g.drawImage(im,0,0,null);
}
}

[aaaabbbccd9876]

Jframe改成Frame试试

[gloomyfish]

说实话，你的程序如果能运行才是神奇！帮你改了一下！ 1.永远不要在paintComponent里面加载任何图片资源，绝对禁止！ 2.永远不要自己尝试获取Swing 2D图形设备对象！而是直接使用！

package com.gloomyfish.swing;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestJPanel extends JPanel {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	// private static Graphics g; very bad way!!!
	private BufferedImage bi;
	public TestJPanel() throws IOException // throws IOException
	{

		File file = new File("D:\\share_folder\\snow2006.jpg");
		bi = null;
		try {
			bi = ImageIO.read(file);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void main(String args[]) throws IOException {
		TestJPanel s = new TestJPanel();
		JFrame jj = new JFrame();

		jj.getContentPane().add(s, BorderLayout.CENTER);

		jj.setSize(300, 300);

		jj.setVisible(true);
	}

	public void paintComponent(Graphics g) {
		if(bi != null)
		{
			g.drawImage(bi, 0, 0, null);			
		}
	}
}