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  1. import javax.swing.*;
  2. import java.awt.*;
  3. import java.awt.event.ActionEvent;
  4. import java.awt.event.ActionListener;
  5.  
  6. class LoginFrame extends JFrame {
  7.     private JTextField usernameField;
  8.     private JPasswordField passwordField;
  9.     private JButton loginButton;
  10.  
  11.     public LoginFrame() {
  12.         setTitle("智慧校园登录");
  13.         setSize(300, 200);
  14.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  15.         setLocationRelativeTo(null);
  16.  
  17.         JPanel panel = new JPanel(new GridLayout(3, 2));
  18.  
  19.         JLabel usernameLabel = new JLabel("用户名:");
  20.         usernameField = new JTextField();
  21.         JLabel passwordLabel = new JLabel("密码:");
  22.         passwordField = new JPasswordField();
  23.         loginButton = new JButton("登录");
  24.  
  25.         panel.add(usernameLabel);
  26.         panel.add(usernameField);
  27.         panel.add(passwordLabel);
  28.         panel.add(passwordField);
  29.         panel.add(new JLabel());
  30.         panel.add(loginButton);
  31.  
  32.         loginButton.addActionListener(new ActionListener() {
  33.             @Override
  34.             public void actionPerformed(ActionEvent e) {
  35.                 String username = usernameField.getText();
  36.                 char[] passwordChars = passwordField.getPassword();
  37.                 String password = new String(passwordChars);
  38.                 // 这里可以添加真正的登录验证逻辑，比如和数据库比对等，暂时简单判断
  39.                 if ("admin".equals(username) && "123456".equals(password)) {
  40.                     JOptionPane.showMessageDialog(LoginFrame.this, "登录成功");
  41.                     // 登录成功后显示主界面，隐藏登录界面
  42.                     MainFrame mainFrame = new MainFrame();
  43.                     mainFrame.setVisible(true);
  44.                     setVisible(false);
  45.                 } else {
  46.                     JOptionPane.showMessageDialog(LoginFrame.this, "用户名或密码错误");
  47.                 }
  48.             }
  49.         });
  50.  
  51.         add(panel);
  52.     }
  53. }
  54.  
  55. class MainFrame extends JFrame {
  56.     public MainFrame() {
  57.         setTitle("智慧校园主界面");
  58.         setSize(600, 400);
  59.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  60.         setLocationRelativeTo(null);
  61.  
  62.         JMenuBar menuBar = new JMenuBar();
  63.  
  64.         JMenu studentMenu = new JMenu("学生管理");
  65.         JMenuItem addStudentItem = new JMenuItem("添加学生");
  66.         JMenuItem viewStudentItem = new JMenuItem("查看学生");
  67.         studentMenu.add(addStudentItem);
  68.         studentMenu.add(viewStudentItem);
  69.  
  70.         JMenu teacherMenu = new JMenu("教师管理");
  71.         JMenuItem addTeacherItem = new JMenuItem("添加教师");
  72.         JMenuItem viewTeacherItem = new JMenuItem("查看教师");
  73.         teacherMenu.add(addTeacherItem);
  74.         teacherMenu.add(viewTeacherItem);
  75.  
  76.         menuBar.add(studentMenu);
  77.         menuBar.add(teacherMenu);
  78.  
  79.         setJMenuBar(menuBar);
  80.  
  81.         // 主界面中间区域可以添加更多具体展示组件，比如表格等展示数据，暂留空白
  82.         JPanel contentPanel = new JPanel();
  83.         add(contentPanel);
  84.     }
  85. }
  86. public class Main {
  87.     public static void main(String[] args) {
  88.         SwingUtilities.invokeLater(() -> {
  89.             LoginFrame loginFrame = new LoginFrame();
  90.             loginFrame.setVisible(true);
  91.         });
  92.     }
  93. }
Success #stdin #stdout #stderr 0.34s 67388KB
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Exception in thread "AWT-EventQueue-0" java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
	at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:197)
	at java.desktop/java.awt.Window.<init>(Window.java:538)
	at java.desktop/java.awt.Frame.<init>(Frame.java:423)
	at java.desktop/java.awt.Frame.<init>(Frame.java:388)
	at java.desktop/javax.swing.JFrame.<init>(JFrame.java:180)
	at LoginFrame.<init>(Main.java:11)
	at Main.lambda$main$0(Main.java:89)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
https://ideone.com/a9uy1v
language:
Java (HotSpot 12)
created:
19 days ago
visibility:
public

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