avaswing与mysql结合 登录注册界面代码

以下是一个简单的基于Java Swing和MySQL的登录注册界面代码，供参考：

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

public class LoginRegisterDemo extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    JLabel title = new JLabel("Login / Register Demo");
    JLabel usernameLabel = new JLabel("Username:");
    JLabel passwordLabel = new JLabel("Password:");
    JTextField usernameField = new JTextField(20);
    JPasswordField passwordField = new JPasswordField(20);
    JButton loginButton = new JButton("Login");
    JButton registerButton = new JButton("Register");

    public LoginRegisterDemo() {
        super("Login / Register Demo");
        setLayout(new BorderLayout());
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints cs = new GridBagConstraints();
        cs.fill = GridBagConstraints.HORIZONTAL;

        cs.gridx = 0;
        cs.gridy = 0;
        cs.gridwidth = 2;
        panel.add(title, cs);

        cs.gridx = 0;
        cs.gridy = 1;
        cs.gridwidth = 1;
        panel.add(usernameLabel, cs);

        cs.gridx = 1;
        cs.gridy = 1;
        cs.gridwidth = 1;
        panel.add(usernameField, cs);

        cs.gridx = 0;
        cs.gridy = 2;
        cs.gridwidth = 1;
        panel.add(passwordLabel, cs);

        cs.gridx = 1;
        cs.gridy = 2;
        cs.gridwidth = 1;
        panel.add(passwordField, cs);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(loginButton);
        buttonPanel.add(registerButton);

        add(panel, BorderLayout.CENTER);
        add(buttonPanel, BorderLayout.PAGE_END);

        loginButton.addActionListener(this);
        registerButton.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        String username = usernameField.getText();
        String password = String.valueOf(passwordField.getPassword());

        if (e.getSource() == loginButton) {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
                PreparedStatement ps = con.prepareStatement("SELECT * FROM users WHERE username=? AND password=?");
                ps.setString(1, username);
                ps.setString(2, password);
                ResultSet rs = ps.executeQuery();

                if (rs.next()) {
                    JOptionPane.showMessageDialog(this, "Login successful!");
                } else {
                    JOptionPane.showMessageDialog(this, "Invalid username or password.");
                }

                con.close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == registerButton) {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
                PreparedStatement ps = con.prepareStatement("INSERT INTO users (username, password) VALUES (?, ?)");
                ps.setString(1, username);
                ps.setString(2, password);
                int result = ps.executeUpdate();

                if (result > 0) {
                    JOptionPane.showMessageDialog(this, "Registration successful!");
                } else {
                    JOptionPane.showMessageDialog(this, "Registration failed.");
                }

                con.close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        LoginRegisterDemo demo = new LoginRegisterDemo();
        demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        demo.setSize(400, 200);
        demo.setVisible(true);
    }
}

在这个例子中，我们使用了MySQL数据库来存储用户的登录信息。`loginButton`和`registerButton`的`ActionListener`处理程序在用户单击按钮时分别执行登录和注册逻辑。当用户登录时，我们会查询数据库以查找匹配的用户名和密码。如果有匹配项，则显示“登录成功”消息框，否则显示“无效的用户名或密码”消息框。当用户注册时，我们将用户名和密码插入到数据库中。如果插入成功，则显示“注册成功”消息框，否则显示“注册失败”消息框。

请确保你已经安装了MySQL JDBC驱动程序并且正确配置了你的MySQL数据库。替换上面代码中的数据库名称、用户名和密码以适合你自己的环境。