세션 로그인, 로그아웃

sessionLogin.jsp

<%@page import="kr.or.ddit.memvo.MemberVO"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Session Login</title>
</head>
<body>

<%
   MemberVO memVo = (MemberVO)session.getAttribute("loginMember");//키값을 적어준것
   if(memVo==null){ //세션이 없을때 ...(로그인이 안되었을때)
%>

<form action="<%=request.getContextPath() %>/sessionLogin.do" 
        method="get">
<table border="1">
  <tr>
    <td>ID : </td>
    <td><input type = "text" name = "id" placeholder="ID 입력하세요"></td>
  </tr>
  <tr>
    <td>PASS : </td>
    <td><input type = "password" name = "pass" placeholder="PassWord 입력하세요"></td>
  </tr>
  <tr>
    <td colspan="2" style="text-align:center;">
			      <input type="submit" value="Login"/>
    </td>
  </tr>

</table>

</form>
<%
  }else{
%>	  
	
	<h3><%=memVo.getMem_id() %>, <%=memVo.getMem_name() %>님 반갑습니다.</h3>
	  <a href="<%=request.getContextPath()%>/sessionLogout.do">로그아웃</a>
<%	  
  }
%>

</body>
</html>

SessionLogin.java - servlet

package kr.or.ddit.basic.session;

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;

import kr.or.ddit.memvo.MemberVO;

@WebServlet("/sessionLogin.do")
public class SessionLogin extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
				//사용자가 입력한 값을 받아오기 위해
				request.setCharacterEncoding("utf-8");
				
				//사용자가 입력한 id와 password를 파라미터로 받는다.
				String userid = request.getParameter("id");
				String pass = request.getParameter("pass");
				
				//실제 회원인지 아닌지 검사하기 위함
				MemberDao dao = MemberDao.getInstance();
				
				//입력받은 데이터를 MemberVO객체에 담는다.
				MemberVO memVo = new MemberVO();
				//파라미터로 받은 아이디와 비밀번호 받기
				memVo.setMem_id(userid);
				memVo.setMem_pass(pass);
				
				//세션객체 만들기(서버가 가진 데이터)
				HttpSession session = request.getSession();
				
				//DB에서 id와 password를 이용하여 해당 회원 정보를 가져온다.
				MemberVO returnMemvo = dao.getLoginMember(memVo);
				if(returnMemvo==null) { //로그인 실패
					response.sendRedirect(
							request.getContextPath()
							+"/session/sessionLogin.jsp");
				}else {//로그인 성공
					session.setAttribute("loginMember", returnMemvo);
					response.sendRedirect(
							request.getContextPath()
							+"/session/sessionLogin.jsp");
				}
				
				
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

SessionLogout.java - servlet

package kr.or.ddit.basic.session;

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;

/**
 * Servlet implementation class SessionLogout
 */
@WebServlet("/sessionLogout.do")
public class SessionLogout extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//로그아웃은 세션정보를 모두 삭제하면 된다.
		
		HttpSession session = request.getSession();
		
		session.invalidate(); //세션 삭제
		
		response.sendRedirect(
				request.getContextPath()
				+"/session/sessionLogin.jsp"); //세션 삭제 후 로그인 페이지로 다시 보내기
		
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

MemberDao - service,controller안만들고 dao만 간단하게 만든것

package kr.or.ddit.basic.session;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import kr.or.ddit.memvo.MemberVO;
import kr.or.ddit.util.DBUtil3;

public class MemberDao {
    private static MemberDao dao;
    
    private MemberDao() {}
    
    public static MemberDao getInstance() {
    	if(dao==null) dao = new MemberDao();
    	return dao;
    }
    
    //세션에 무엇을 저장할지에 따라 메서드가 달라짐
    public MemberVO getLoginMember(MemberVO memVo) {
    	Connection conn = null;
    	PreparedStatement pstmt = null;
    	ResultSet rs = null;
    	
    	MemberVO memberVo = null; // 로그인한 결과가 저장될 변수
    	
    	try {
			conn = DBUtil3.getConnection();
			
			String sql = "select * from mymember "
					+ "where mem_id=? and mem_pass=?";
			pstmt = conn.prepareStatement(sql);
			
			pstmt.setString(1, memVo.getMem_id());
			pstmt.setString(2, memVo.getMem_pass());
			
			rs = pstmt.executeQuery();
			
			if(rs.next()) {
				memberVo = new MemberVO();
				
				memberVo.setMem_id(rs.getString("mem_id"));
				memberVo.setMem_pass(rs.getString("mem_pass"));
				memberVo.setMem_name(rs.getString("mem_name"));
				memberVo.setMem_tel(rs.getString("mem_tel"));
				memberVo.setMem_addr(rs.getString("mem_addr"));
			}
			
			
		} catch (SQLException e) {
			memberVo = null;
			e.printStackTrace();
		}finally {
			if(rs!=null)try {rs.close();}catch(SQLException e) {}
			if(pstmt!=null)try {pstmt.close();}catch(SQLException e) {}
			if(conn!=null)try {conn.close();}catch(SQLException e) {}
		}
    	
    	return memberVo;
    }
}

Author And Source

이 문제에 관하여(세션 로그인, 로그아웃), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://velog.io/@susan9905/세션-로그인-로그아웃

우수한 개발자 콘텐츠 발견에 전념 (Collection and Share based on the CC Protocol.)

세션 로그인, 로그아웃

Author And Source

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