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JSP, Servlet / 쿠키 본문

JSP, Servlet / 쿠키

JinHwan Kim 2020. 5. 14. 07:08

Cookie

 

   request에서 쿠키를 가져와 처리하고, 새로운 쿠키를 생성해 응답하는 방법

 

1. Get Cookies, Get Cookie Info

Cookie[] cookies = request.getCookies();

Cookie cookie = cookies[0];

cookie.getName();  

cookie.getValue();

2. Create new Cookie

Cookie c = new Cookie(cookieName,cookieValue); // 쿠키 생성 (이름,값)

c.setMaxAge(sec);      // 쿠키 생존 시간 설정

response.addCookie(c); // 응답에 쿠키 추가

 

예시 )

 

loginInfo 쿠키가 없으면 로그인 요구 후, 쿠키 생성

 

loginForm.jsp

<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
    
<%@ page errorPage = "Error.jsp" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
	<%
	Cookie[] cookies = request.getCookies();
	Cookie loginInfo = null;
	
	if(cookies != null){
		for(Cookie c : cookies){
			if(c.getName().equals("loginInfo")){
				loginInfo = c;
			}
		}
	}
	%>
	
	<%
		if(loginInfo == null){
	%>
	<p>먼저 로그인을 하세요</p>
	<form action= "login" method ="post">
		<p>
			<strong>아이디</strong>
			<input type="text" name="id" value="아이디 입력">
		</p>
		<p>
			<strong>비밀번호</strong>
			<input type="password" name="pw" value="비밀번호 입력">
		</p>
		<p>
			<input type="submit" value="제출">
		</p>
	</form>
	
	<%
		}else{
	%>
	<p> 당신의 로그인 id <%= loginInfo.getValue()%> </p>
	<%
	}
	%>
</body>
</html>

 

ServletEX.class

@WebServlet("/login")
public class ServletEX extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String id = request.getParameter("id");
		String pw = request.getParameter("pw");

		Cookie[] cookies = request.getCookies();
		Cookie loginCookie = null;
		
		if(cookies != null) {
			for(Cookie c : cookies) {
				System.out.println(c.getName()+ " "+c.getValue());
				
				if(c.getName().equals("loginInfo")) {
					loginCookie = c; 
				}
			}
		}
		if(loginCookie == null) {
			System.out.println("new login");
	        loginCookie = new Cookie("loginInfo",id);
		}
		
		response.addCookie(loginCookie);
		loginCookie.setMaxAge(60*60);
		
		response.sendRedirect("loginForm.jsp");
	}


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