- 로그인, 회원가입 했을 때 세션값 할당
[loginAction.jsp]
UserDAO userDao = new UserDAO();
int result = userDao.login(user.getUserID(), user.getUserPassword());
if(result == 1) {
session.setAttribute("userID", user.getUserID());
out.println("<script>");
out.println("location.href = 'main.jsp'");
out.println("</script>");
}[joinAction.jsp]
else {
UserDAO userDao = new UserDAO();
int result = userDao.join(user);
if(result == -1) {
out.println("<script>");
out.println("alert('이미 존재하는 아이디입니다.');");
out.println("history.back()");
out.println("</script>");
}
else {
session.setAttribute("userID", user.getUserID());
out.println("<script>");
out.println("location.href = 'main.jsp'");
out.println("</script>");
}
}- 로그아웃 페이지
[logoutAction.jsp]
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="UTF-8">
<title>JSP 게시판 웹 사이트</title>
</head>
<body>
<%
session.invalidate();
%>
<script>
location.href = "main.jsp";
</script>
</body>
</html>- 세션이 할당된 사람의 로그인,회원가입 막기
[loginAction.jsp]
UserDAO userDao = new UserDAO();
String userID = null;
if(session.getAttribute("userID") != null) {
userID = (String) session.getAttribute("userID");
}
if(userID != null) {
out.println("<script>");
out.println("alert('이미 로그인이 되어있습니다.')");
out.println("location.href = 'main.jsp'");
out.println("</script>");
}[joinAction.jsp]
String userID = null;
if(session.getAttribute("userID") != null) {
userID = (String) session.getAttribute("userID");
}
if(userID != null) {
out.println("<script>");
out.println("alert('이미 로그인이 되어있습니다.')");
out.println("location.href = 'main.jsp'");
out.println("</script>");
}- index.jsp 변경
location.href = 'main.jsp';
- 메인 페이지 만들기
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<title>JSP 게시판 웹사이트</title>
</head>
<body>
<%
String userID = null;
if(session.getAttribute("userID") != null) {
userID = (String) session.getAttribute("userID");
}
%>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="login.jsp">JSP 게시판</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#navbarNav" aria-controls="navbarNav"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active"> <!-- 여기안바꿈 -->
<a class="nav-link active" href="main.jsp">메인</a>
</li>
<li class="nav-item">
<a class="nav-link" href="bbs.jsp">게시판</a>
</li>
</ul>
<%
if(userID == null) {
%>
<ul class="navbar-nav">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown"
aria-expanded="false"> 접속하기 </a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="login.jsp">로그인</a>
<a class="dropdown-item" href="join.jsp">가입하기</a>
</div>
</li>
</ul>
<%
} else {
%>
<ul class="navbar-nav">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown"
aria-expanded="false"> 회원관리 </a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="logoutAction.jsp">로그아웃 </a>
</div>
</li>
</ul>
<%
}
%>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
</body>
</html>
코딩주니어