Servlet & JSP day17 - Front Controller

 

 

Front Controller 패턴

☞ client의 요청을 집중시키는 앞단 controller

☞ controller들의 공통로직을 앞단에서 처리

☞ 모든 Client의 요청을 한곳에 집중시킴

☞ 기존의 서블릿을 대신하는 각 서블릿과 이름이 동일한 Controller를 작성하고 Forwarding을 통해서 MemberFrontController(앞단 controller)에서 command 명령에 따라 각각의 controller로 수행을 지시한다.

 

 

MemberFrontController.java

 

 

package member.controller;

import java.io.IOException;

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

import member.dto.ForwardDTO;
public class MemberFrontController extends HttpServlet {
 private static final long serialVersionUID = 1L;
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  doPost(request,response);
 }
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  //Controller 수행 전 작업(공통) - 한글처리
  request.setCharacterEncoding("UTF-8");
  
  //Controller 로직 처리 - Controller 로직 호출
  String command =  request.getParameter("command");
  
  Controller ctr  = null;
  if(command.equals("login")) {
   ctr= new LoginController();
  }
  else if(command.equals("logout")) {
   ctr = new LogoutController();
  }
  else if(command.equals("member_info")) {
   ctr = new GetLoginMemberInforController();
  }
  else if(command.equals("modifyForm")) {
   ctr= new ModifyFormController();
  }
  else if(command.equals("modify")) {
   ctr= new ModifyMemberController();
  }
  else if(command.equals("register")) {
   ctr = new RegisterMemberController();
  }
  else if(command.equals("remove")) {
   ctr = new RemoveMemberController();
  }
  else if(command.equals("allmember")) {
   ctr = new GetAllMemberInfoController();
  }
  else if(command.equals("searchMileage")) {
   ctr= new SearchByMileageRangeController();
  }
  else if(command.equals("searchMemberByName")) {
   ctr = new SearchMemberByNameController();
  }
  ForwardDTO fdto = null;
  try {
   fdto = ctr.execute(request, response);
  } catch (Exception e) {
   e.printStackTrace();
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  //Controller 수행 후 작업(공통) - 응답(View로 수행 이동)
  if(fdto.isRedirect()) {
   response.sendRedirect(fdto.getUrl());
  } else {
   RequestDispatcher rdp = request.getRequestDispatcher(fdto.getUrl());
   rdp.forward(request, response);
  }
  
  
 }

}

 

Controller.java

package member.controller;

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

import member.dto.ForwardDTO;

//모든 Controller 클래스의 type이 되는 interface
//컨트롤러 로직 처리 메소드 선언
public interface Controller {
 public ForwardDTO execute(HttpServletRequest request, HttpServletResponse response) throws Exception;

}
 

 

GetAllMemberInfoController.java

package member.controller;

import java.sql.SQLException;
import java.util.ArrayList;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class GetAllMemberInfoController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  MemberManagerService mms = MemberManagerService.getInstance();
  ForwardDTO fdto =null;
  try {
   ArrayList <MemberDTO> list = mms.getMemberList();
   request.setAttribute("list", list);
   fdto = new ForwardDTO("/res/member_list.jsp", false);
  } catch (SQLException e) {
   e.printStackTrace();
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  return fdto;
 }

}

 

GetLoginMemberInfoController.java

package member.controller;

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

import member.dto.ForwardDTO;

public class GetLoginMemberInforController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  ForwardDTO fdto = null;
  if(session.getAttribute("mto") ==null) {
   session.setAttribute("error_message" , "로그인하지 않았습니다. 로그인 먼저 해주세요");
   fdto = new ForwardDTO("/login_form.jsp", false);
  }
  else
  {
   fdto = new ForwardDTO("/res/member_detail.jsp", false);
  }
  return fdto;
 }

}

 

LoginController.java

package member.controller;

import java.sql.SQLException;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class LoginController implements Controller{
 public ForwardDTO execute(HttpServletRequest request, HttpServletResponse response) throws Exception {
  String id = request.getParameter("id");
  String password = request.getParameter("password");
  HttpSession session = request.getSession();
  MemberManagerService mms = MemberManagerService.getInstance();
  ForwardDTO fdto = null;
  try {
   MemberDTO mto = mms.getMemberById(id);
   if(mto !=null) {
    if(password.equals(mto.getPassword())) {
     session.setAttribute("mto", mto);
     fdto = new ForwardDTO("/res/login_success.jsp", false);
    } else {
     request.setAttribute("error_message", "비밀번호가 일치하지 않습니다.");
     fdto = new ForwardDTO("/login_form.jsp", false);
    }
   } else {
    request.setAttribute("error_message", "ID가 일치하지 않습니다,");
    fdto = new ForwardDTO("/login_form.jsp", false);
   }
  } catch (SQLException e) {
   e.printStackTrace();
   request.setAttribute("error_message", e.getMessage());
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  return fdto;
 }
}

 

LogoutController.java

package member.controller;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;

public class LogoutController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request, HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  MemberDTO mto = (MemberDTO)session.getAttribute("mto");
  if(mto==null)
  {
   request.setAttribute("error_message", "로그인 후 로그아웃 할 수 있습니다.");
  } else {
   session.invalidate();
  }
  return new ForwardDTO("/login_form.jsp", false);
 }
}

 

ModifyFormController.java

package member.controller;

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

import member.dto.ForwardDTO;

public class ModifyFormController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  ForwardDTO fdto = null;
  if(session.getAttribute("mto") != null) {
   fdto = new ForwardDTO("/res/modify_form.jsp", false);
  }
  else {
   session.setAttribute("error_message" , "로그인하지 않았습니다. 로그인 먼저 해주세요");
   fdto = new ForwardDTO("/login.form.jsp", false);
  }
  return fdto;
 }

}

 

 

ModifyMemberController.java

package member.controller;

import java.sql.SQLException;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class ModifyMemberController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request, HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  MemberDTO mto = (MemberDTO)session.getAttribute("mto");
  ForwardDTO fdto = null;
  if(mto == null){//로그인 안된 경우
   request.setAttribute("error_message", "로그인 후 회원정보 수정이 가능합니다. 로그인 먼저 하세요");
   fdto = new ForwardDTO("/login_form.jsp", false);
  }else{
   MemberDTO m = (MemberDTO)request.getAttribute("mto");
   try {
    MemberManagerService mms = MemberManagerService.getInstance();
    mms.modifyMember(m);
    fdto = new ForwardDTO("/res/member_detail.jsp", false);
    mto.setPassword(m.getPassword());
    mto.setName(m.getName());
    mto.setRegisterNumber1(m.getRegisterNumber1());
    mto.setRegisterNumber2(m.getRegisterNumber2());
   } catch (SQLException e) {
    e.printStackTrace();
    request.setAttribute("error_message", e.getMessage());
    fdto = new ForwardDTO("/res/error.jsp", false);
   }
  }
  return fdto;
 }
}

 

RegisterMemberController.java

package member.controller;

import java.sql.SQLException;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.exception.DuplicatedIdException;
import member.exception.DuplicatedRegisterNumberException;
import member.model.service.MemberManagerService;

public class RegisterMemberController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  MemberDTO mto = (MemberDTO) request.getAttribute("mto");
  // 2. Business Logic 처리 - MemberManagerService.regiseterMember()
  MemberManagerService mms = MemberManagerService.getInstance();
  ForwardDTO fdto = null;
  try {
   mms.registerMember(mto);
   // 3. 응답 - register_success.jsp, error.jsp
   fdto = new ForwardDTO("/res/register_success.jsp", false);

  } catch (SQLException e) {
   e.printStackTrace();
   fdto = new ForwardDTO("/res/error.jsp", false);
  } catch (DuplicatedIdException e) {
   e.printStackTrace();
   fdto = new ForwardDTO("/res/error.jsp", false);
  } catch (DuplicatedRegisterNumberException e) {
   e.printStackTrace();
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  return fdto;
 }

}

 

RemoveMemberController.java

package member.controller;

import java.sql.SQLException;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class RemoveMemberController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  MemberDTO mto = (MemberDTO)session.getAttribute("mto");
  ForwardDTO fdto =null;
  if(mto == null) {
   session.setAttribute("error_message", "로그인 후 회원 탈퇴가 가능합니다. 로그인 먼저 하세요");
   fdto = new ForwardDTO("/login_form.jsp", false);
  } else {
   MemberManagerService mms = MemberManagerService.getInstance();
   try {
    mms.removeMemberById(mto.getId());
    session.setAttribute("message", "회원탈퇴가 성공적으로 처리되었습니다");
    fdto = new ForwardDTO("/index.jsp", false);
    session.invalidate();
   } catch (SQLException e) {
    e.printStackTrace();
    session.setAttribute("error_message", e.getMessage());
    fdto = new ForwardDTO("/error.jsp", false);
   }
  }
  return fdto;
 }

}

 

SearchByMileageRangeController.java

package member.controller;

import java.util.ArrayList;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class SearchByMileageRangeController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  MemberManagerService mms = MemberManagerService.getInstance();
  ForwardDTO fdto =null;
  try {
   ArrayList<MemberDTO> list = mms.searchMemberByMileageRange(Integer.parseInt(request.getParameter("range")), Integer.parseInt(request.getParameter("range1")));
   request.setAttribute("list", list);
   request.setAttribute("title", "마일리지 범위로 조회 결과");
   request.setAttribute("search_value", Integer.parseInt(request.getParameter("range"))+"~"+Integer.parseInt(request.getParameter("range1")));
   fdto = new ForwardDTO("/res/search_result.jsp", false);
  } catch (Exception e) {
   e.printStackTrace();
   request.setAttribute("error_message", "입력 형태가 정확하지 않습니다");
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  return fdto;
 }

}

 

SearchMemberByNameController.java

package member.controller;

import java.sql.SQLException;
import java.util.ArrayList;

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

import member.dto.ForwardDTO;
import member.dto.MemberDTO;
import member.model.service.MemberManagerService;

public class SearchMemberByNameController implements Controller {

 @Override
 public ForwardDTO execute(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  MemberManagerService mms = MemberManagerService.getInstance();
  ForwardDTO fdto = null;
  
  try {
  ArrayList<MemberDTO> list = mms.searchMemberByName(request.getParameter("name"));
  request.setAttribute("list", list);
  request.setAttribute("title", "이름으로 조회 결과");
  request.setAttribute("search_value", request.getParameter("name"));
  fdto = new ForwardDTO("/res/search_result.jsp", false);
  } catch(SQLException e) {
   e.printStackTrace();
   request.setAttribute("error_message", "입력 형태가 정확하지 않습니다");
   fdto = new ForwardDTO("/res/error.jsp", false);
  }
  return fdto;
 }
 
}