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Web/JSP_Servlet

MVC_FrontController

by guswn100059 2023. 5. 3.

Context path 경로 변경

MessageSystem을 복사해서 FrontController로 붙여넣어주기

=> 오류남

=> MessageSystem과 path가 동일하면 실행이 안되기 때문.

 

오류해결방법

방법 1.

server.xml 파일에 들어가서 /MessageSystem이라는 path를 수정

 

 

방법 2.

 

Controller - Interface로 메소드 선언

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

// interface : 양식 => 추상메소드/상수만을 정의 (강제성 부여)
public interface Controller {

	// 추상메소드
	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;

	
}

 

GoMainController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GoMainCon implements Controller {

	// 각각의 요청을 처리하는 로직을 메소드로 정의
	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		
		// 1. 데이터 수집
		// 2. 기능구현
		
		// 3. View 선택
		return "main";
	}
}

 

GoSuccessController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GoSuccessCon implements Controller{
	
	// ctrl + shift + o > import 자동단축키
	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		
		// 1. 데이터 수집
		
		// 2. 기능구현
		
		// 3. View 선택
		return "join_success";
	}
}

 

JoinController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;

public class JoinCon implements Controller {

	@Override
	public String execute(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// 1. 데이터 수집
		request.setCharacterEncoding("UTF-8");

		String email = request.getParameter("email");
		String pw = request.getParameter("pw");
		String tel = request.getParameter("tel");
		String address = request.getParameter("address");

		// 데이터가 2개 이상이라면, DTO로 묶어놓기
		Member dto = new Member();
		dto.setEmail(email);
		dto.setPw(pw);
		dto.setTel(tel);
		dto.setAddress(address);

		// 2. 기능 구현 : DB에 회원정보를 저장(DAO)
		// 2-1) DAO를 생성
		MemberDAO dao = new MemberDAO();
		int row = dao.join(dto);

		// 3. View 선택

		String nextView = null;
		
		if (row > 0) {
			// 성공 => 회원가입 성공 페이지
			nextView = "redirect:/goSuccess.do";
		} else {
			// 실패 => 메인페이지
			nextView = "redirect:/goMain.do";
		}

		// 페이지 이동
		// forward vs redirect
		// c->v(jsp) c->c(Servlet)
		// 기능의 중복 실행을 방지하기 위해서 url을 초기화하려고 redirect를 사용하는 것

		return nextView;
	}

}

 

LoginController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;

public class LoginCon implements Controller {

	@Override
	public String execute(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");

		// 데이터 수집
		String email = request.getParameter("email");
		String pw = request.getParameter("pw");

		Member dto = new Member();
		dto.setEmail(email);
		dto.setPw(pw);

		// 기능 구현
		MemberDAO dao = new MemberDAO();
		Member user = dao.login(dto);

		// View 연결
		// 방법 1. 성공실패 구분해서 console 창에 출력
		// 방법 2. 데이터를 저장해서 옮길 수 있는 객체 4가지
		// pageContext
		// request <=> forward 이동과 함께 초기화
		// session <= 브라우저 닫힐 때까지 유효
		// application

		if (user != null) {
			System.out.println("로그인 성공");

			// 1) 세션 객체 받아오기
			HttpSession session = request.getSession();

			// 2) 세션에 데이터 저장
			session.setAttribute("user", user);

		} else {
			System.out.println("로그인 실패");
		}

		String nextView =  "redirect:/goMain.do";
		
		return nextView;
		
	}

}

 

LogoutController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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;


public class LogoutController implements Controller {

	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// 1. 데이터 수집 => X
		
		// 2. 기능 구현 
		// 세션에 저장되어있는 사용자 정보를 삭제
		HttpSession session = request.getSession();
		
		session.removeAttribute("user");
		
		// 3. view 선택
		
		String nextView = "redirect:/goMain.do";
		
		return nextView;
		
	}

}

 

UpdateController

package kr.smhrd.controller;

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 kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;


public class UpdateController implements Controller {
	
	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// 1. 데이터 수집
		request.setCharacterEncoding("UTF-8");
		
		String pw = request.getParameter("pw");
		String tel = request.getParameter("tel");
		String address = request.getParameter("address");
		
		// email은 session으로부터 꺼내오기
		HttpSession session = request.getSession();
		Member user = (Member)session.getAttribute("user");
		String email = user.getEmail();
		
		// DTO 객체로 묶기
		Member dto = new Member();
		dto.setPw(pw);
		dto.setTel(tel);
		dto.setAddress(address);
		dto.setEmail(email);
		
		// 2. 기능 구현
		MemberDAO dao = new MemberDAO();
		int row = dao.update(dto);
		
		// 3. View 선택
		String nextView = null;
		
		if(row>0) {
			nextView = "redirect:/goMain.do";
			
			// seesion에 저장된 데이터 업데이트
			session.setAttribute("user", dto);
			
		}else {
			nextView = "redirect:/update.do";
		}
		
		return nextView;
		
		
	}

}

 

GoSelectController

package kr.smhrd.controller;

import java.io.IOException;
import java.util.List;

import javax.servlet.RequestDispatcher;
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 kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;


public class GoSelectController implements Controller {

	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// 1. 데이터 수집 => X
		
		// 2. 기능 구현
		MemberDAO dao = new MemberDAO();
		List<Member> list = dao.select();
		
		// select.jsp한테 list를 넘겨주기
		// Controller => jsp로 데이터를 넘겨줄 때 request를 사용
		request.setAttribute("list", list);
		
		// View 선택
		String nextView =  "select";
		
		return nextView;
		
	}

}

 

GoUpdateController

package kr.smhrd.controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;


public class GoUpdateController implements Controller {

	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// 1. 데이터 수집
		
		// 2. 기능 구현
		
		// 3. View 선택
		
		// C -> jsp : forward
		return "update";
	}

}

 

DeleteController

package kr.smhrd.controller;

import java.io.IOException;
import java.util.List;

import javax.servlet.RequestDispatcher;
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 kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;


public class DeleteController implements Controller {

	public String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// 1. 데이터 수집
		String email = request.getParameter("email");
		
		// 2. 기능구현
		MemberDAO dao = new MemberDAO();
		int row = dao.delete(email);
		
		// 3. View 선택
		String nextView = "redirect:/goSelect.do";
		
		return nextView;
		
	}

}

 

FrontController

package kr.smhrd.frontController;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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.smhrd.controller.Controller;
import kr.smhrd.controller.DeleteController;
import kr.smhrd.controller.GoMainCon;
import kr.smhrd.controller.GoSelectController;
import kr.smhrd.controller.GoSuccessCon;
import kr.smhrd.controller.GoUpdateController;
import kr.smhrd.controller.JoinCon;
import kr.smhrd.controller.LoginCon;
import kr.smhrd.controller.LogoutController;
import kr.smhrd.controller.UpdateController;
import kr.smhrd.dao.MemberDAO;
import kr.smhrd.entity.Member;

// 모든 요청을 받을 수 있도록 url-mapping을 *로 지정
// @WebServlet("*.do") => .do로 끝나는 모든 요청
@WebServlet("*.do")
public class FrontController extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		// url은 아래 주소 전체를 나타냄
		// http://localhost:8081/MessageSystem/join?email=1234
		
		// 1. 요청 구분
		// uri는 /MessageSystem/join 를 나타냄
		String uri = request.getRequestURI();
		
		// /MessageSystem 를 꺼내오는 방법
		String cpath = request.getContextPath();
		
		// /join만 떼오기
		// String.subString(); => 문자열 슬라이싱
		// ex) 안녕하세요.
		// ex) String.subString(2); => "하세요."
		// ex) String.subString(2, 3); => "하"
		String command = uri.substring(cpath.length());
		
		System.out.println(command);
		
		
		// ==========================================================
		
		Controller con = null; // 업캐스팅을 이용한 중복제거
		
		// 2. 요청에 따라서 기능을 실행
		String nextView = null;
		
		if(command.equals("/goMain.do")) {
			
			con = new GoMainCon();
			
			
		}else if(command.equals("/goSuccess.do")) {
			
			con = new GoSuccessCon();
			
			
		}else if(command.equals("/join.do")) {
			
			con = new JoinCon();
			
			
		}else if(command.equals("/login.do")) {
			
			con = new LoginCon();
			
		}else if(command.equals("/logout.do")) {
			con = new LogoutController();
			
		}else if(command.equals("/update.do")) {
			con = new UpdateController();
			
		}else if(command.equals("/goSelect.do")) {
			con = new GoSelectController();
			
		}else if(command.equals("/goUpdate.do")) {
			con = new GoUpdateController();
			
		}else if(command.equals("/delete.do")) {
			con = new DeleteController();
		}
		
		
		// ================================================================
		
		if(con != null) {
			
			nextView = con.execute(request, response);
			
		}
		
		// 3. 페이지 이동
		// 예외처리용
		if(nextView != null) {
			// redirect vs forward 구분하기 위해서 규칙필요
			// 앞으로 redirect 요청은 반드시 앞에 redirect:/를 붙이자.
			// goMain.do => redirect:/goMain.do
			if(nextView.contains("redirect:/")) {
				// nextView = "redirect:/goMain.do"
				// nextView.split(":/"); => ["redirect", "goMain.do"]
				response.sendRedirect(nextView.split(":/")[1]);	
			}else {
				RequestDispatcher rd = 
						request.getRequestDispatcher("WEB-INF/views/"+nextView+".jsp");
				rd.forward(request, response);
			}
		}
		
	}

}

 

 

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