swing登录界面代码

以下是一个简单的Swing登录界面代码示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Login extends JFrame implements ActionListener {
    private JPanel panel;
    private JLabel userLabel, passwordLabel, messageLabel;
    private JTextField userText;
    private JPasswordField passwordText;
    private JButton loginButton, resetButton;

    public Login() {
        setTitle("登录");
        setSize(350, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        panel = new JPanel();
        panel.setLayout(null);

        userLabel = new JLabel("用户名:");
        userLabel.setBounds(10, 20, 80, 25);
        panel.add(userLabel);

        userText = new JTextField(20);
        userText.setBounds(100, 20, 165, 25);
        panel.add(userText);

        passwordLabel = new JLabel("密码:");
        passwordLabel.setBounds(10, 50, 80, 25);
        panel.add(passwordLabel);

        passwordText = new JPasswordField(20);
        passwordText.setBounds(100, 50, 165, 25);
        panel.add(passwordText);

        loginButton = new JButton("登录");
        loginButton.setBounds(10, 90, 80, 25);
        loginButton.addActionListener(this);
        panel.add(loginButton);

        resetButton = new JButton("重置");
        resetButton.setBounds(180, 90, 80, 25);
        resetButton.addActionListener(this);
        panel.add(resetButton);

        messageLabel = new JLabel();
        messageLabel.setBounds(10, 120, 300, 25);
        panel.add(messageLabel);

        add(panel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            String user = userText.getText();
            String password = new String(passwordText.getPassword());
            if (user.equals("admin") && password.equals("admin123")) {
                messageLabel.setText("登录成功！");
            } else {
                messageLabel.setText("用户名或密码错误！");
            }
        } else if (e.getSource() == resetButton) {
            userText.setText("");
            passwordText.setText("");
            messageLabel.setText("");
        }
    }

    public static void main(String[] args) {
        new Login();
    }
}

此代码创建了一个简单的登录窗口，包括用户名和密码的输入框、登录和重置按钮，以及一个用于显示登录结果的标签。用户输入用户名和密码后，点击登录按钮，程序将会检验用户名和密码是否正确，如果正确则会显示登录成功的信息，否则会显示用户名或密码错误的信息。点击重置按钮，程序将会清空用户名和密码的输入框及登录结果标签的内容。