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用Java编写一个登录页面 – Java课程总结
2023-06-13 02:46:26 深夜i     --     --
Java编程 登录页面 示例代码

在Java课程学习的过程中，我们经常需要编写登录页面。本文将通过一个具体的示例，介绍如何用Java编写一个简单的登录页面。

代码实现：



import javax.swing.*;


import java.awt.event.ActionEvent;


import java.awt.event.ActionListener;


public class LoginPage implements ActionListener {


  private static JLabel userLabel;


  private static JTextField userText;


  private static JLabel passwordLabel;


  private static JPasswordField passwordText;


  private static JButton loginButton;


  private static JLabel successLabel;


  public static void main(String[] args) {


    JFrame frame = new JFrame("Login Page");


    userLabel = new JLabel("User:");


    userLabel.setBounds(10, 10, 80, 25);


    frame.add(userLabel);


    userText = new JTextField(20);


    userText.setBounds(100, 10, 160, 25);


    frame.add(userText);


    passwordLabel = new JLabel("Password:");


    passwordLabel.setBounds(10, 40, 80, 25);


    frame.add(passwordLabel);


    passwordText = new JPasswordField();


    passwordText.setBounds(100, 40, 160, 25);


    frame.add(passwordText);


    loginButton = new JButton("Login");


    loginButton.setBounds(10, 80, 80, 25);


    loginButton.addActionListener(new LoginPage());


    frame.add(loginButton);


    successLabel = new JLabel("");


    successLabel.setBounds(10, 110, 300, 25);


    frame.add(successLabel);


    frame.setSize(350, 200);


    frame.setLayout(null);


    frame.setVisible(true);


  }


  @Override


  public void actionPerformed(ActionEvent e) {


    String user = userText.getText();


    String password = passwordText.getText();


    System.out.println("User: " + user);


    System.out.println("Password: " + password);


    if (user.equals("admin") && password.equals("admin123")) {


      successLabel.setText("Login successful!");


    } else {


      successLabel.setText("Invalid username or password");


    }


  }


}
  
  

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