java swing数据库

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.ResultSet;
import java.sql.Statement;

public class DBConnectionDemo extends JFrame {
    private JTextField textField;
    private JTextArea textArea;

    public DBConnectionDemo() {
        setTitle("数据库连接示例");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        textField = new JTextField();
        add(textField, BorderLayout.NORTH);

        textArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(textArea);
        add(scrollPane, BorderLayout.CENTER);

        JButton button = new JButton("查询");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                queryDatabase();
            }
        });
        add(button, BorderLayout.SOUTH);
    }

    private void queryDatabase() {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "root";
        String password = "password";
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 加载 JDBC 驱动
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 建立连接
            conn = DriverManager.getConnection(url, user, password);

            // 创建 Statement 对象
            stmt = conn.createStatement();

            // 执行查询
            String sql = "SELECT * FROM mytable WHERE name = '" + textField.getText() + "'";
            rs = stmt.executeQuery(sql);

            // 处理结果集
            while (rs.next()) {
                String name = rs.getString("name");
                int age = rs.getInt("age");
                textArea.append("姓名：" + name + "，年龄：" + age + "\n");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new DBConnectionDemo().setVisible(true);
            }
        });
    }
}