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具体效果图：

详细代码：

package java_gui;import java.awt.Color;import java.awt.Container;import java.awt.Cursor;import java.awt.Font;import java.awt.Image;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPasswordField;import javax.swing.JRootPane;import javax.swing.JTextField;public class Login extends JFrame {
   		private static final long serialVersionUID = -6788045638380819221L;		//用户名		private JTextField ulName;		//密码		private JPasswordField ulPasswd;		//小容器		private JLabel j1;		private JLabel j2;		private JLabel j3;		private JLabel j4;		//小按钮		private JButton b1;		private JButton b2;		private JButton b3;		//复选框		private JCheckBox c1;		private JCheckBox c2;		//列表框		private JComboBox
   
     cb1;		/**		 * 初始化QQ登录页面		 * */		public Login() {
   			//设置登录窗口标题			this.setTitle("QQ登录");			//去掉窗口的装饰(边框)			//  this.setUndecorated(true);			//采用指定的窗口装饰风格			this.getRootPane().setWindowDecorationStyle(JRootPane.NONE);			//窗体组件初始化			init();			this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);			//设置布局为绝对定位			this.setLayout(null);			this.setBounds(0, 0, 355, 265);			//设置窗体的图标			Image img0 = new ImageIcon("D:/logo.png").getImage();			this.setIconImage(img0);			//窗体大小不能改变			this.setResizable(false);			//居中显示			this.setLocationRelativeTo(null);			//窗体显示			this.setVisible(true);		}		/**		 * 窗体组件初始化		 * */		public void init() {
   			//创建一个容器,其中的图片大小和setBounds第三、四个参数要基本一致(需要自己计算裁剪)			Container container = this.getContentPane();			j1 = new JLabel();			//设置背景色			Image img1 = new ImageIcon("D:/bgimg.png").getImage();			j1.setIcon(new ImageIcon(img1));			j1.setBounds(0, 0, 355, 265);			//qq头像设定			j2 = new JLabel();			Image img2 = new ImageIcon("D:/hdimg.png").getImage();			j2.setIcon(new ImageIcon(img2));			j2.setBounds(40, 95, 50, 53);			//用户名输入框			ulName = new JTextField();			ulName.setBounds(100, 100, 150, 20);			//注册账号			j3 = new JLabel("注册账号");			j3.setBounds(260, 100, 70, 20);			//密码输入框			ulPasswd = new JPasswordField();			ulPasswd.setBounds(100, 130, 150, 20);			//找回密码			j4= new JLabel("找回密码");			j4.setBounds(260, 130, 70, 20);			//记住密码			c1 = new JCheckBox("记住密码");			c1.setBounds(105, 155, 80, 15);			//自动登陆			c2 = new JCheckBox("自动登陆");			c2.setBounds(185, 155, 80, 15);			//用户登陆状态选择			cb1 = new JComboBox
    
     ();			cb1.addItem("在线");			cb1.addItem("隐身");			cb1.addItem("离开");			cb1.setBounds(40, 150, 55, 20);			//登陆按钮			b1 = new JButton("登录");			//设置字体和颜色和手形指针			b1.setFont(new Font("宋体", Font.PLAIN, 12));			b1.setForeground(Color.RED);			b1.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));			b1.setBounds(280, 200, 65, 20);			//给按钮添加			b1.addActionListener(new ActionListener() {
   				@Override				public void actionPerformed(ActionEvent e) {
   					String cmd = e.getActionCommand();					if("登录".equals(cmd)) {
   						String username = ulName.getText();						String userpassword = ulPasswd.getText();						if(username.equals("tskk") && userpassword.equals("123456")) {
   							JOptionPane.showConfirmDialog(null, "登录成功");						} else {
   							JOptionPane.showConfirmDialog(null, "登录失败");						}					}				}			});			//多账号			b2 = new JButton("多账号");			b2.setBounds(5, 200, 75, 20);			//设置			b3 = new JButton("设置");			b3.setBounds(100, 200, 65, 20);			//所有组件用容器装载			j1.add(j2);			j1.add(j3);			j1.add(j4);			j1.add(c1);			j1.add(c2);			j1.add(cb1);			j1.add(b1);			j1.add(b2);			j1.add(b3);			container.add(j1);			container.add(ulName);			container.add(ulPasswd);		}		public static void main(String[] args) {
   			new Login();		}}
    
   

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