Java+Swing+Mysql实现超市管理系统

实现一个超市管理系统涉及许多组件和步骤，以下是一个简化的代码示例，展示了如何使用Java Swing和MySQL创建一个超市管理系统的用户登录界面。

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
 
public class SuperMarketSystem {
 
    private JFrame loginFrame;
    private JLabel userLabel;
    private JLabel passwordLabel;
    private JTextField userTextField;
    private JPasswordField passwordField;
    private JButton loginButton;
 
    public SuperMarketSystem() {
        initUI();
    }
 
    private void initUI() {
        loginFrame = new JFrame("超市管理系统登录");
        loginFrame.setSize(300, 200);
        loginFrame.setLayout(new GridLayout(3, 2));
 
        userLabel = new JLabel("用户名:");
        passwordLabel = new JLabel("密码:");
        userTextField = new JTextField(20);
        passwordField = new JPasswordField(20);
 
        loginButton = new JButton("登录");
        loginButton.addActionListener(new LoginActionListener());
 
        loginFrame.add(userLabel);
        loginFrame.add(userTextField);
        loginFrame.add(passwordLabel);
        loginFrame.add(passwordField);
        loginFrame.add(loginButton);
 
        loginFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        loginFrame.setLocationRelativeTo(null);
        loginFrame.setVisible(true);
    }
 
    class LoginActionListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            String username = userTextField.getText();
            String password = new String(passwordField.getPassword());
 
            if (authenticate(username, password)) {
                JOptionPane.showMessageDialog(loginFrame, "登录成功！");
                // 登录成功后的代码
            } else {
                JOptionPane.showMessageDialog(loginFrame, "登录失败，用户名或密码错误！");
            }
        }
    }
 
    private boolean authenticate(String username, String password) {
        String url = "jdbc:mysql://localhost:3306/supermarketdb";