JAVA 在 JFrame中加个背景图片的问题 急

这是我写的一段代码，只是个框架。比如我图片在E盘如何加载背景图片，怎么弄？？麻烦写的详细点（写的详细可用加分50）

import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class 出院结算 extends JFrame {

private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;

public 出院结算() {
super();
initialize();
}

private void initialize() {
this.setSize(300, 200);
this.setContentPane(getJContentPane());
this.setTitle("JFrame");
}

private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(null);
}
return jContentPane;
}

}

---

1楼的很不错。。建议采用。。
我给你写握扮竖详细点。。

package 娱乐;

import java.awt.Container;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Test extends JFrame {

public Test() {
setBak(); //调用背景方法
Container c = getContentPane(); //获取JFrame面板
JPanel jp = new JPanel(); //创建个JPanel
jp.setOpaque(false); //把JPanel设段大置为透明 这样就不会遮住后面的背景 这样你就能在JPanel随缺没意加组件了
c.add(jp);
setSize(540, 450);
setVisible(true);
}
public void setBak(){
((JPanel)this.getContentPane()).setOpaque(false);
ImageIcon img = new ImageIcon("c://Sunset.jpg");
JLabel background = new JLabel(img);this.getLayeredPane().add(background, new Integer(Integer.MIN_VALUE));
background.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());
}

public static void main(String[] args) {
Test s = new Test();
s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}

---

public void setBak(){
((JPanel)this.getContentPane()).setOpaque(false);ImageIcon img = new ImageIcon("img/icon.gif");
JLabel background = new JLabel(img);this.getLayeredPane().add(background, new Integer(Integer.MIN_VALUE));
background.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());
}

---