JSP 다른 페이지로 옮겨주는 Servlet Controller

 

String command = null;
		String page = null;
		if(request.getParameter("command")==null)
			command="list";
		else command = request.getParameter("command");
		
		switch(command) {
			case "list" : {
				page = "action/BoardList.jsp";
				break;
			}
			case "writeForm" : {
				page = "view/BoardWriteForm.jsp";
				break;
			}
			case "writeAction" : {
				page = "action/BoardWriteAction.jsp";
				break;
			}			
			default : {
				page = "view/Error.jsp";
				break;
			}
		}
		RequestDispatcher dp = request.getRequestDispatcher(page);
		dp.forward(request, response);
	}

 

전체

package 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;

/**
 * Servlet implementation class BoardController
 */
@WebServlet("/jb")
public class BoardController extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * Default constructor. 
     */
    public BoardController() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String command = null;
		String page = null;
		if(request.getParameter("command")==null)
			command="list";
		else command = request.getParameter("command");
		
		switch(command) {
			case "list" : {
				page = "action/BoardList.jsp";
				break;
			}
			case "writeForm" : {
				page = "view/BoardWriteForm.jsp";
				break;
			}
			case "writeAction" : {
				page = "action/BoardWriteAction.jsp";
				break;
			}			
			default : {
				page = "view/Error.jsp";
				break;
			}
		}
		RequestDispatcher dp = request.getRequestDispatcher(page);
		dp.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);
	}

	
/*	얘 안 쓴다.
	private void doPro(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// controller 역할
		// MVC 아키텍쳐 스타일을 기본으로 추가해서 작성
		// controller : 화면에서 url을 받아서 해당 비즈니스 로직으로 보내고 리턴으로 view를 받는다.
		// Model : 데이터 전송 오브젝트(DTO), 데이터 접근 오브젝트(DAO)
		// View : 화면을 출력하는 것으로 사용자와 접속하는 인터페이스 (jsp)
		String command = request.getParameter("command");
		System.out.println(command);
		String view="./view/BoardWriteForm.jsp";
		switch(command) {
			case "BList":{
				//게시판 글을 읽어와서 저장하는 처리
				//foward로 해당 페이지로 보내서 주소는 변경 X
				view = "./view/BoradList.jsp";
			}
			case "BWriteForm":{
				view = "./view/BoardWriteForm.jsp";
			}
		RequestDispatcher rd = request.getRequestDispatcher(view);
		try {
			rd.forward(request, response);
		} catch (ServletException | IOException e) {
			e.printStackTrace();
		}
		}
	}
*/
}