my sql db 사용중이고 테이블은 이렇게 만들어져 있습니다.

이 db에서 id pw와 일치하는 cur 값을 가져오고 싶은데 코드를 어떻게 수정해야할까요

package com.munggu.org;

import java.beans.Statement;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.websocket.Session;

import javafx.scene.control.Alert;

import javax.sql.*;



@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

public LoginServlet() {
super();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

HttpSession session = request.getSession();

RequestDispatcher rd = null;
ResultSet rs = null;
Connection conn = null;
PreparedStatement pstmt = null;
String 가입시간 = null;

try {
Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/2_1","root","1234");

String 아이디 = request.getParameter("id");
String 비밀번호 = request.getParameter("pw");

pstmt = conn.prepareStatement("SELECT * FROM MEMBER WHERE ID='" + 아이디 + "' AND PW='" + 비밀번호 + "'");
rs = pstmt.executeQuery();

Boolean 로그인확인 = false;
while(rs.next()) {
가입시간 = rs.getString("cur");
로그인확인 = true;
}

if(로그인확인) {
session.setAttribute("아이디", 아이디) ;
session.setAttribute("비밀번호", 비밀번호);
session.setAttribute("가입시간", 가입시간);

session.setMaxInactiveInterval(60*5);
response.sendRedirect("login.jsp");
}

} catch (Exception e) {
rd = request.getRequestDispatcher("error.jsp");
} finally{
try {
if(rs != null)
rs.close();
} catch (SQLException e) {

e.printStackTrace();
}
try {
if(pstmt != null)
pstmt.close();
} catch (SQLException e) {

e.printStackTrace();
}
try {
if(conn != null)
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

rd.forward(request,response);
}
}