java登录界面背景设置 一个java写的QQ登录的界面 请问背景图片如何设置

一个java写的QQ登录的界面，请教背景图片怎么设置

importjava.awt.Color;

importjava.awt.Font;

importjavax.swing.ImageIcon;

importjavax.swing.JButton;

importjavax.swing.JCheckBox;

importjavax.swing.JComboBox;

importjavax.swing.JFrame;

importjavax.swing.JLabel;

importjavax.swing.JMenu;

importjavax.swing.JMenuBar;

importjavax.swing.JMenuItem;

importjavax.swing.JPanel;

importjavax.swing.JTextField;

publicclassQQextendsJFrame{

/**

*@paramargs

*/

publicQQ(){

super("QQ");

this.setSize(390,300);

this.setLayout(null);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanelp=(JPanel)this.getContentPane();

//账号输入框

JTextFieldtf1=newJTextField();

tf1.setBounds(80,100,200,30);

p.add(tf1);

//注册账号标签

JLabellb1=newJLabel("注册账号");

lb1.setBounds(300,100,70,27);

p.add(lb1);

lb1.setFont(newFont("仿宋",Font.BOLD,14));

lb1.setForeground(Color.BLUE);

JTextFieldtf2=newJTextField();

tf2.setBounds(80,140,200,27);

p.add(tf2);

//找回密码标签

JLabellb2=newJLabel("找回密码");

lb2.setBounds(300,140,70,27);

p.add(lb2);

lb2.setFont(newFont("仿宋",Font.BOLD,14));

lb2.setForeground(Color.BLUE);

//记住密码，自动登录多选框

JCheckBoxck1=newJCheckBox("记住密码");

JCheckBoxck2=newJCheckBox("自动登录");

ck1.setBounds(80,180,80,30);

ck2.setBounds(170,180,80,30);

p.add(ck1);

p.add(ck2);

//登录按钮

JButtonbtn=newJButton("登录");

btn.setBounds(100,210,140,30);

p.add(btn);

btn.setFont(newFont("仿宋",Font.BOLD,16));

//多账号登录

JButtonbtn1=newJButton("多账号");

btn1.setBounds(10,210,80,30);

p.add(btn1);

btn1.setFont(newFont("仿宋",Font.BOLD,14));

//加头像

ImageIconimage=newImageIcon("英雄头像\\Ahri.png");

JLabellb3=newJLabel(image);

p.add(lb3);

lb3.setBounds(5,100,70,70);

//下拉菜单,表状态

JComboBoxcbox=newJComboBox();

//ImageIconcm=newImageIcon("a.gif");

cbox.addItem("离开");

cbox.addItem("隐身");

cbox.addItem("上线");

cbox.addItem("忙碌");

cbox.setBounds(20,180,60,25);

p.add(cbox);

JMenuBarm=newJMenuBar();

m.setDefaultLocale(null);

m.setLayout(null);

m.setLocation(0,50);

m.setBounds(0,100,10,10);

JMenumm=newJMenu("图");

JMenuItemmi1=newJMenuItem("在线");

JMenuItemmi2=newJMenuItem("影身");

JMenuItemmi3=newJMenuItem("忙碌");

JMenuItemmi4=newJMenuItem("离开");

this.setJMenuBar(m);

m.add(mm);

mm.add(mi1);

mm.add(mi2);

mm.add(mi3);

mm.add(mi4);

this.setResizable(false);//不允许放大，改变窗口大小等

this.setVisible(true);

}

publicstaticvoidmain(String[]args){

QQq=newQQ();

}

}

这是我写的QQ登录的界面，但是不知道怎么设置背景图片，请各位大神指教

QQ

GUI

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------解决方案--------------------

importjava.awt.Color;

importjava.awt.Font;

importjava.awt.Graphics;

importjava.awt.Image;

importjava.io.File;

importjava.io.IOException;

importjavax.imageio.ImageIO;

importjavax.swing.ImageIcon;

importjavax.swing.JButton;

importjavax.swing.JCheckBox;

importjavax.swing.JComboBox;

importjavax.swing.JFrame;

importjavax.swing.JLabel;

importjavax.swing.JMenu;

importjavax.swing.JMenuBar;

importjavax.swing.JMenuItem;

importjavax.swing.JPanel;

importjavax.swing.JTextField;

publicclassQQextendsJFrame{

/**

*@paramargs

*/

publicQQ(){

super("QQ");

this.setSize(390,300);

this.setLayout(null);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//JPanelp=(JPanel)this.getContentPane();

JPanelp=newImagePane();

this.setContentPane(p);

//账号输入框

JTextFieldtf1=newJTextField();

tf1.setBounds(80,100,200,30);

p.add(tf1);

//注册账号标签

JLabellb1=newJLabel("注册账号");

lb1.setBounds(300,100,70,27);

p.add(lb1);