Java サーブレットはデータベースとどのように対話するのでしょうか?

import java.sql.*;

public class DatabaseConnectionExample {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        // 数据库连接信息
        String url = "jdbc:mysql://localhost:3306/test";
        String user = "root";
        String password = "password";

        try {
            // 建立数据库连接
            conn = DriverManager.getConnection(url, user, password);

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

            // 执行查询
            rs = stmt.executeQuery("SELECT * FROM users");

            // 遍历结果集
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                // 打印结果
                System.out.println("ID: " + id + ", Name: " + name);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 释放资源
            try {
                if (rs != null) {
                    rs.close();
                }
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}