2019.02.01 Cookie와 Session의 활용 : 로그인 유지 상태

2019. 2. 1. 13:25ㆍJSP

#1 sessionLogin.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>sessionLogin</title>
</head>
<body>
<%
    // 로그인 유지작업 
    Cookie[] cookies = request.getCookies();
    if(cookies != null ){
        for(Cookie cookie : cookies){
            if(cookie.getName().equals("id")){
                /* 실행흐름이 서버에 있을 경우 서버코드로써 강제이동
                       서버에서 클라이언트()에게 특정페이지로 이동하는 정보만 응답으로 준다.
                   java코드로 페이지 이동 -> sendRedirect("url");
                */
                response.sendRedirect("sessionMain.jsp");
            }
        }
    }
%>
 
 
 
    <h1>로 그 인</h1>
    <form action="sessionLoginPro.jsp" method="post">
        아  이  디: <input type="text" name="id"><br>
        패스 워드: <input type="password" name="pw"><br>
        <input type="checkbox" name ="loginChk" value="true">로그인 상태유지<br>
        <input type ="submit" value ="login">
    </form>
 
</body>
</html>
cs



#2 sessionLoginPro.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Information</title>
</head>
<body>
    <%
        //post방식 - 전송데이터를 한글처리해야된다.
        request.setCharacterEncoding("utf-8");
        
        // 파라미터값 가져오기 
        String id = request.getParameter("id");
        String pw = request.getParameter("pw");
        String loginChk =request.getParameter("loginChk");
        System.out.println(loginChk);
        
        
        // 기존 데이터베이스의 사용자아이디, 패스워드
        String dbId = "박보검";
        String dbPasswd = "1234";
        // 기존정보와 사용자입력정보를 비교
        // 정보가 일치할 경우 로그인 == 세션값 생성 "id" id / 이동 ssesionMain.jsp
        if(id.equals(dbId)){
            
        }else {
            out.println("아이디가 일치하지않음.\n");
            %>
            <script>
            alert('아이디가 일치하지않음');
            location.href='sessionLogin.jsp';    
            </script>
            <%
        }
        
        
        if(pw.equals(dbPasswd)){
            // 로그인작업 - 세션생성
             session.setAttribute("id", id);
            
            // 사용자의 로그인 유지여부를 체크박스null확인으로 한다.-> checkbox는 체크되지않으면 null값이 리턴된다.
            if(loginChk != null){
                // null값이 아니라면 id값을 쿠키로 저장
                Cookie cookie = new Cookie("id",id);
                cookie.setMaxAge(60*2);
                cookie.setPath("/");
                response.addCookie(cookie);
            }
                %>
                <script>
                alert('로그인이 인증됨\n 메인페이지로 이동');
                location.href='sessionMain.jsp';    
                </script>
                <%
        
        }
        else{
            out.println("비밀번호가 일치하지않음.");
            %>
            <script>
            alert('비번호가 일치하지않음');
            location.href='sessionLogin.jsp';    
            </script>
            <%
        }
        %>
</body>
</html>
cs



#3 sessionMain.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Main</title>
</head>
<body>
 
    <% 
        //세션값 가져오기
        String id = (String)session.getAttribute("id");
    %>
    <%
        // 이미 로그인된 사용자가 Main.jsp로 넘어오면 쿠키로 사용자를 찾아 세션으로 주입
        // 쿠키값을 세션으로 주입해 , 대신하여 로그인과정을 진행한다.
        Cookie[] cookies = request.getCookies();
        if(cookies != null){
            for(Cookie cookie : cookies){
                if(cookie.getName().equals("id")){
                    session.setAttribute("id", cookie.getValue());
                }
            }
        }
    %>
 
    <h1>메인페이지</h1>
    <%=id %>님이 로그인 하였습니다
    <br>
 
    <input type="button" value="로그아웃"
        onclick="location.href='sessionOut.jsp'">
 
</body>
</html>
cs



#4 sessionOut.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>로그아웃</title>
</head>
<body>
    <%
        // 세션 초기화
        session.invalidate();
        
        // 로그인 유지 쿠키 삭제
        Cookie[] cookies = request.getCookies();
        if(cookies != null){
            for(Cookie cookie : cookies){
                if(cookie.getName().equals("id")){
                    cookie.setMaxAge(0);
                    cookie.setPath("/");
                    response.addCookie(cookie);
                }
            }
        }
        
    %>
    <script>
        alert('로그아웃됨.세션이 초기화됨');
        location.href='sessionLogin.jsp';    
    </script>
</body>
</html>
cs



#5 실행화면

->> checkbox에 체크되면 id를 기억하는 쿠키가 생성됨




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