(RequestDispatcher 위치) org.apache.jasper.JasperException

[오류본]

 

package com.saeyan.controller;

import javax.servlet.RequestDispatcher;
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;

import com.saeyan.dao.MemberDAO;
import com.saeyan.dto.MemberVO;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/login.do")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		// response.getWriter().append("Served at: ").append(request.getContextPath());
		
		RequestDispatcher dispatcher = request.getRequestDispatcher("member/login.jsp");
		dispatcher.forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		// doGet(request, response);
		System.out.println("doPost1");
		String url = "member/login.jsp";
		
		String userid = request.getParameter("userid"); 
		String pwd = request.getParameter("pwd");
		MemberDAO mDao = MemberDAO.getInstance();
		int result = mDao.userCheck(userid, pwd);
		
		if( result == 1 ) {
			MemberVO mVo = mDao.getMember(userid);
			HttpSession session = request.getSession();
			session.setAttribute("loginUser", mVo);
			request.setAttribute("message", "회원가입에 성공했습니다");
			url = "main.jsp";
			
		}else if( result == 0 ) {
			request.setAttribute("message", "비밀번호가 맞지 않습니다");
		}else if( result == -1 ) {
			request.setAttribute("message", "존재하지 않는 회원입니다");
		}
		RequestDispatcher dispatcher = request.getRequestDispatcher(url);
		dispatcher.forward(request, response);
		// doGet(request, response);
	}
}

 

[ 성공본 ]

 

package com.saeyan.controller;

import javax.servlet.RequestDispatcher;
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;

import com.saeyan.dao.MemberDAO;
import com.saeyan.dto.MemberVO;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/login.do")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		// response.getWriter().append("Served at: ").append(request.getContextPath());
		
		RequestDispatcher dispatcher = request.getRequestDispatcher("member/login.jsp");
		dispatcher.forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		// doGet(request, response);
		System.out.println("doPost1");
		String url = "member/login.jsp";
		
		String userid = request.getParameter("userid"); 
		String pwd = request.getParameter("pwd");
		MemberDAO mDao = MemberDAO.getInstance();
		int result = mDao.userCheck(userid, pwd);
		
		if( result == 1 ) {
			MemberVO mVo = mDao.getMember(userid);
			HttpSession session = request.getSession();
			session.setAttribute("loginUser", mVo);
			request.setAttribute("message", "회원가입에 성공했습니다");
			url = "main.jsp";
			
		}else if( result == 0 ) {
			request.setAttribute("message", "비밀번호가 맞지 않습니다");
		}else if( result == -1 ) {
			request.setAttribute("message", "존재하지 않는 회원입니다");
		}
		RequestDispatcher dispatcher = request.getRequestDispatcher(url);
		//dispatcher.forward(request, response);
		
		doGet(request, response);
	}
}

 

 회원정보 관리 하는데 있어서 필요한 로그인 정보 확인을 했다

 

 

3시간 가량 같은 오류로 맴돌았다.

 

코드를 하나하나 다 따라가 보니 이쯤에서 오류가 나오는게 맞는데

 

 

구글링 해보니까 RequestDispatcher 은 어디 페이지로 바로 이동할지 지정해주는 방식이라고 했다

 

결국 그러니까

 

 

책대로 나온 코드를 주석 처리 시키고 doGet (request,response); 를 사용하니까 나이스