javamsyqlswing图书馆管理系统java代码

以下是一个简单的Java MySQL Swing图书馆管理系统的代码示例：

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

public class LibraryManagementSystem extends JFrame implements ActionListener {
    JLabel l1, l2, l3;
    JTextField tf1, tf2;
    JButton btn1, btn2;

    LibraryManagementSystem() {
        setTitle("图书馆管理系统");
        setVisible(true);
        setSize(700, 700);
        setLayout(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        l1 = new JLabel("图书馆管理系统");
        l1.setForeground(Color.blue);
        l1.setFont(new Font("Serif", Font.BOLD, 30));

        l2 = new JLabel("用户名:");
        l3 = new JLabel("密码:");
        tf1 = new JTextField();
        tf2 = new JPasswordField();
        btn1 = new JButton("登录");
        btn2 = new JButton("重置");

        l1.setBounds(100, 30, 400, 30);
        l2.setBounds(80, 70, 200, 30);
        l3.setBounds(80, 110, 200, 30);
        tf1.setBounds(300, 70, 200, 30);
        tf2.setBounds(300, 110, 200, 30);
        btn1.setBounds(150, 160, 100, 30);
        btn2.setBounds(270, 160, 100, 30);

        add(l1);
        add(l2);
        add(tf1);
        add(l3);
        add(tf2);
        add(btn1);
        add(btn2);
        btn1.addActionListener(this);
        btn2.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btn1) {
            int x = 0;
            String s1 = tf1.getText();
            String s2 = tf2.getText();
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/library", "root", "password");
                PreparedStatement ps = con.prepareStatement("select * from login where username=? and password=?");
                ps.setString(1, s1);
                ps.setString(2, s2);
                ResultSet rs = ps.executeQuery();
                if (rs.next()) {
                    x = 1;
                }
            } catch (Exception ex) {
                System.out.println(ex);
            }
            if (x == 1) {
                JOptionPane.showMessageDialog(btn1, "登录成功");
            } else {
                JOptionPane.showMessageDialog(btn1, "用户名或密码错误");
            }
        } else {
            tf1.setText("");
            tf2.setText("");
        }
    }

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