安卓servlet mysql数据库

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class MyServlet extends HttpServlet {
    private static final String DB_URL = "jdbc:mysql://localhost:3306/mydatabase";
    private static final String USER = "username";
    private static final String PASS = "password";

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            stmt = conn.createStatement();
            String sql = "SELECT * FROM users";
            rs = stmt.executeQuery(sql);

            PrintWriter out = response.getWriter();
            while (rs.next()) {
                out.println("ID: " + rs.getInt("id") + ", Name: " + rs.getString("name"));
            }
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}