I am a student who has just studied Ajax.
I have been constantly worried, but I have not been able to solve the problem.
So, I want to get some advice from you.
First, I will show the loginPage.jsp code and the MemberController.java code and the MemberService.java code.
It is loginPage.jsp code.
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/swiper.min.css">
<link rel="stylesheet" href="css/loginPage.css">
<script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="js/swiper.jquery.min.js"></script>
<title>Insert title here</title>
</head>
<body>
<jsp:include page="header.jsp" />
<div class="loginPage_main">
<div class="pageName">
<img class="pageName_image" src="images/greeting_title.jpg">
<div class="pageName_explanation">
<p>로그인</p>
</div>
</div>
<div class="location">
</div>
<div class="loginForm_area">
<div class="hidden_area">
<div class="img_lock_area">
<img src="images/lock.png" class="img_lock">
</div>
<form action="loginOK.do" id="login_frm" name="frm" method="post" onsubmit="return checkValue()">
<div class="input_zone">
<div class="input_id">
<span> ID</span><input type="text" placeholder="아이디를 입력하세요" style="width:280px;margin-left: 10px;" name="id">
</div>
<div class="input_pw">
<span>PW</span><input type="password" placeholder="비밀번호를 입력하세요" style="width:280px;margin-left: 10px;" name="pw">
</div>
</div>
</form>
<div class="loginBtn" onclick="document.getElementById('login_frm').onsubmit();">
<div style="margin-top: 22px;">
<span class="loginOK">Login</span>
</div>
</div>
</div>
</div>
</div>
<script type="text/javascript">
function checkValue()
{
var form = document.frm;
if(!form.id.value || !form.pw.value)
{
alert('아이디 혹은 비밀번호를 입력하세요.');
return false;
}
$.ajax
({
type: 'POST',
url: 'loginOK.do',
success: function()
{
alert('success');
},
error: function()
{
alert('error');
}
})
}
</script>
</body>
</html>
It is MemberController.java code.
package controller;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import service.MemberService;
@Controller
public class MemberController
{
@Autowired
public MemberService mService;
// 로그인
// 전송된 ID,PW값과 DB에 있는 ID,PW값 비교
// 맞으면 alert 창으로 " 로그인 성공 " 메세지 표출 + mainPage 이동
// 틀리다면 alert 창으로 " 로그인 실패 " 메세지 표출 + loginPage로 리다이렉트
@RequestMapping("loginOK.do")
public String login(String id, String pw,HttpSession session, HttpServletRequest request, HttpServletResponse response) throws IOException
{
HashMap<String, Object> loginIdentify = mService.login(id,pw);
System.out.println("ID is : " + id + " / " + "PW is : " + pw);
if(loginIdentify != null)
{
System.out.println("loginIdentify is true : " + loginIdentify);
session.setAttribute("id", id);
session.setAttribute("pw", pw);
/*
- 오류로 인한 일시 보류 -
response.setCharacterEncoding("UTF-8");
PrintWriter writer = response.getWriter();
writer.println("<script type='text/javascript'>");
writer.println("alert('로그인 성공!');");
writer.println("</script>");
writer.flush();
*/
}
else
{
System.out.println("loginIdentify is false : " + loginIdentify);
/*
- 오류로 인한 일시 보류 -
response.setCharacterEncoding("UTF-8");
PrintWriter writer = response.getWriter();
writer.println("<script type='text/javascript'>");
writer.println("alert('로그인 실패!');");
writer.println("</script>");
writer.flush();
*/
return "redirect:move_loginPage.do";
}
return "redirect:main.do";
}
// 로그아웃
// 세션과 쿠키 제거 + mainPage로 리다이렉트
@RequestMapping("logout.do")
public String logout(HttpSession session, HttpServletResponse response)
{
session.removeAttribute("id");
Cookie cookie = new Cookie("id", null);
cookie.setMaxAge(0);
response.addCookie(cookie);
// 세션 삭제 확인
System.out.println("session is delete It's really? : " + session.getAttribute("id"));
return "redirect:main.do";
}
}
It is MemberService.java code.
package service;
import java.util.HashMap;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import dao.IMemberDAO;
import model.Member;
@Service
public class MemberService
{
@Autowired
private IMemberDAO memberDao;
public HashMap<String, Object> login(String id,String pw)
{
HashMap<String, Object> result = memberDao.selectOne(id);
System.out.println(result);
if(result != null)
{
String opwd = (String) result.get("pw");
if(opwd.equals(pw))
{
return result;
}
else
{
return null;
}
}
else
{
return null;
}
}
}
When the form tag is executed, the ID value and PW value entered are compared with the ID value and PW value stored in the DB.
If the values match, go to the main page.
If the values do not match, you will not be able to log in without reloading the page! I want to print a message. How can I get it to work the way I want?
I do not know where to start.... I need your help vigorously. Please advice to me your plan.
