Eclipse中jframe怎么用属性设背景图片

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设置为透明 这样就不会遮住后面的背景 这样你就能在JPanel随意加组件了
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 paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(image,0,0,this.getWidth(),this.getHeight(),null);
}