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14. SessionJSP/실전 JSP 2022. 11. 6. 15:27
14-1. Session 이란?
- Cookie와 같은 용도
- Cookie는 브라우저에 생성되고 저장되지만 Session은 서버(웹 컨테이너)에서 생성되고 그 정보가 서버에 저장된다.
14-2. Session 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> <% if(session.getAttribute("memberId") != null) 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>LoginCon.java
package com.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; @WebServlet("/loginCon") public class LoginCon extends HttpServlet { private static final long serialVersionUID = 1L; 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); HttpSession session = request.getSession(); session.setAttribute("memberId", mID); response.sendRedirect("loginOk.jsp"); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }LogoutCon.java
package com.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; @WebServlet("/logoutCon") public class LogoutCon extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(); session.invalidate(); response.sendRedirect("login.jsp"); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
- 세션이 생성되었기 때문에 로그아웃을 하지 않으면 login페이지로 들어가도 loginOk페이지로 이동된다.
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