java 设置jpane背景图片l

package loginclient;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import java.awt.Color;

public class loginclient extends JFrame {

	private JPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					loginclient frame = new loginclient();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public loginclient() {
		
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
	    contentPane.setBackground(new Color(0, 206, 209));
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JPanel panel = new JPanel() {  
            @Override  
            protected void paintComponent(Graphics g) {  
                ImageIcon icon = new ImageIcon("src//1.PNG");  
                Image img = icon.getImage();  
                g.drawImage(img, 0, 0, icon.getIconWidth(), icon.getIconHeight(), icon.getImageObserver());  
            }  
        };  
		//panel.setBounds(100, 100, 450, 300);
		panel.setBounds(41, 51, 58, 20);
		contentPane.add(panel);
		//this.add(panel, BorderLayout.CENTER);  
        //this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        //this.setVisible(true);  
	}
}