13. Cookie

JSP/실전 JSP

13. Cookie

c0mmedes 2022. 11. 6. 00:52

13-1. Cookie란 ?

클라이언트와 서버의 연결을 유지시켜주는 방법
브라우저(클라이언트)와 서버가 연결을 시도한 흔적을 남김
보안에 취약할 수 있음

13-2. Cookie 구현

login.jsp

<%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		<%
			Cookie[] cookies = request.getCookies();
			System.out.println("cookies : " + cookies);
		
			if(cookies != null) {
				for(Cookie c : cookies) {
					if(c.getName().equals("memberId")) {
						response.sendRedirect("loginOk.jsp");
					}
				}
			}
		%>
		
		<form action="loginCon" method="post">
		
			ID : <input type="text" name="mID"></br>
			PW : <input type="password" name="mPW"></br>
			<input type="submit" value="login">
		
		</form>
		 
    </body>
</html>

loginOk.jsp

<%@ page language="java" contentType="text/html; charset=EUC-KR" 
   pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="EUC-KR">
        <title>Insert title here</title>
    </head>
    <body>
		
		<%
		
			Cookie[] cookies = request.getCookies();
			for(Cookie c : cookies) {
				out.print("name : " + c.getName() + "</br>");
				out.print("value : " + c.getValue() + "</br></br>");
			}
		
		%>
		
    </body>
</html>

LoginCon.java

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/loginCon")
public class LoginCon extends HttpServlet {


	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		PrintWriter out = response.getWriter();
		
		String mId = request.getParameter("mID");
		String mPw = request.getParameter("mPW");
		
		out.print("mId : " + mId);
		out.print("mPw : " + mPw);
		
		Cookie[] cookies = request.getCookies();
		Cookie cookie = null;
		
		for (Cookie c : cookies) {
			
			System.out.println("c.getName() : " + c.getName() + ", c.getValue() : " + c.getValue());
			
			if(c.getName().equals("memberId")) {
				cookie = c;
			}
		}
		
		if(cookie == null) {
			System.out.println("cookie is null");
			cookie = new Cookie("memberId", mId);
		}
		
		response.addCookie(cookie);
		cookie.setMaxAge(60*60);
		
		response.sendRedirect("loginOk.jsp");
		
	}

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

}