main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.io.PrintWriter" %>
<!DOCTYPE html>
<html>
<head>
<meta
http-equiv="Content-Type" content="text/html; charset=UTF-8">
<!-- 뷰포트 -->
<meta
name="viewport" content="width=device-width" initial-scale="1">
<!-- 스타일시트 참조 -->
<link rel="stylesheet" href="css/bootstrap.min.css">
<title>게시판 웹 사이트</title>
</head>
<body>
<%
String userID = null;
if(session.getAttribute("userID") != null) {
userID = (String) session.getAttribute("userID");
}
%>
<!-- 네비게이션 -->
<nav class="navbar navbar-default">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expaned="false">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="main.jsp">JSP 게시판</a>
</div>
<div class="collapsenavbar-collapse" id="#bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active">
<a href="main.jsp">메인</a>
</li>
<li>
<a href="bbs.jsp">게시판</a>
</li>
</ul>
<%
if(userID == null){
%>
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">접속하기<span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li>
<a href="Lee.jsp">로그인</a>
</li>
<li>
<a href="join.jsp">회원가입</a>
</li>
</ul>
</li>
</ul>
<%
} else {
%>
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">회원 관리<span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li>
<a href="logoutAction.jsp">로그아웃</a>
</li>
</ul>
</li>
</ul>
<%
}
%>
</div>
</nav>
<!-- 애니매이션 담당 JQUERY -->
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<!-- 부트스트랩 JS -->
<script src="js/bootstrap.js"></script>
</body>
</html>이렇게 만들게 된다면 로그인이 되었을때랑 로그인이 안됐을때랑 구분되어 나타나게 된다.
1. 로그인 x
2. 로그인 O
3. 로그아웃 - 잘 된다.
고라니