[Servlet] 모델2 MVC

Model - 화면에 출력하고자 하는 정보를 담고 있음(bean)
View - 화면. (html,jsp)
Controller - 정보제어. 데이터를 가공하는 역할(java-class=서블릿:웹페이지가 될 수 있는 클래스)
-> 프론트와 벡을 분답하여 분업하기 좋음

model2를 사용할때는 web.xml 를 프로젝트 단위로 만들어줘야 한다

다이나믹 웹 프로젝트 생성시 next 2번 하고 체크박스 체크해주면 된다

만들고 나면 webapp -> WEB-INF 밑에 web.xml 이 있다

FirstController.java

package jspservlet.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;

/**
 * Servlet implementation class FirstController
 */
@WebServlet("/first.do")  //가상경로 지정
public class FirstController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FirstController() {
        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());
	}

	/**
	 * @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);
	}

}

서블릿 실행할때 클래스에서 실행하는게 아니라 프로젝트에서 마우스 오른쪽 클릭 후 run on server

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>index</title>
</head>
<body>
	<h2>서블릿 연습 프로젝트!</h2><hr>
	<h3>가상경로 연습하기</h3>
	<a href="<%= request.getContextPath() %>/seconde.do">seconde.do로 이동하기</a> 
	<!-- 화면에 seconde.do servlet page!! 출력 -->
	| 
	<a href="<%= request.getContextPath() %>/board/list.do">/board/list.do로 이동하기</a>
	<!-- 화면에 board/list.do servlet page!! 출력 --> 
</body>
</html>

SecondeController.java

package jspservlet.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;

/**
 * Servlet implementation class SecondeController
 */
@WebServlet("/seconde.do")
public class SecondeController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SecondeController() {
        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("seconde.do servlet page!!");
	}

	/**
	 * @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);
	}

}

BoardListController.java

package jspservlet.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;

/**
 * Servlet implementation class BoardController
 */
@WebServlet("/board/list.do")
public class BoardListController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public BoardListController() {
        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("board/list.do servlet page!!");
	}

	/**
	 * @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);
	}

}

package jspservlet.controller;

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;

/**
 * Servlet implementation class SecondeController
 */
@WebServlet("/seconde.do")
public class SecondeController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SecondeController() {
        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("seconde.do servlet page!!");
		
		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		
		PrintWriter pw = response.getWriter();
		pw.println("<html>");
		pw.println("<head>");
		pw.println("<title>seconde 페이지</title>");
		pw.println("</head>");
		pw.println("<body>");
		pw.println("<h2>가상경로 연습 두번째 페이지</h2>");
		pw.println("</body>");
		pw.println("</html>");
		
		pw.flush();
	}

	/**
	 * @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);
	}

}

redirect
새로운 경로로 이동
request 새로 생성됨(상단의 경로 변경됨)

forward
새로운 경로로 이동
request가 전부 전달됨(url그대로)

response 사용하지 않음

SecondeController.java

package jspservlet.controller;

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;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//화면 포워드
        request.getRequestDispatcher("/secondeView.jsp").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);
	}

}

secondeView.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>seconde View</title>
</head>
<body>
	<h2>서블릿 연습 두번째 페이지</h2><hr>
	
</body>
</html>

BoardListController.java

package jspservlet.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;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.getRequestDispatcher("/board/list.jsp").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);
	}

}

BoardListController

board 폴더의 list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>board/list</title>
</head>
<body>
	<h2>게시글 목록페이지</h2><hr>
	<!--  
	/board/list.do
	가상경로 요청시 해당 페이지가 포워드 될 수 있도록 컨트롤러를 수정하세요
	-->
</body>
</html>

값 보내기

SecondeController.java

request의 attribute를 사용하면 컨트롤러에서 가공한 데이터를 view로 전달할 수 있다

map과 유사하게 키와 값
키는 무조건 String, 값은 object타입

package jspservlet.controller;

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;

/**
 * Servlet implementation class SecondeController
 */
@WebServlet("/seconde.do")
public class SecondeController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SecondeController() {
        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("seconde.do servlet page!!");
		/*
		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		
		PrintWriter pw = response.getWriter();
		pw.println("<html>");
		pw.println("<head>");
		pw.println("<title>seconde 페이지</title>");
		pw.println("</head>");
		pw.println("<body>");
		pw.println("<h2>가상경로 연습 두번째 페이지</h2>");
		pw.println("</body>");
		pw.println("</html>");
		
		pw.flush();
		*/
		
		String data = "전송데이터";
		
		/*
		request의 attribute를 사용하면 컨트롤러에서 가공한 데이터를 view로 전달할 수 있다
		*/
		//map과 유사하게 키와 값
		//키는 무조건 String, 값은 object타입
		request.setAttribute("key", data);
		
		
		//화면 포워드
		request.getRequestDispatcher("/secondeView.jsp").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);
	}

}

secondeView.jsp

request의 attribute 값은 object타입이므로 강제 형변환 필요

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String data = (String)request.getAttribute("key");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>seconde View</title>
</head>
<body>
	<h2>서블릿 연습 두번째 페이지</h2><hr>
	<%= data %>
</body>
</html>

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내 블로그 - 관리자 홈 전환	`Q` `Q`
새 글 쓰기	`W` `W`

글 수정 (권한 있는 경우)	`E` `E`
댓글 영역으로 이동	`C` `C`

이 페이지의 URL 복사	`S` `S`
맨 위로 이동	`T` `T`
티스토리 홈 이동	`H` `H`
단축키 안내	`Shift` + `/` `⇧` + `/`

[Servlet] 모델2 MVC

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