티렉터리 패턴: 별개의 서블릿 찾아가기/어쩌구
확장자 패턴 : 무조건 *.do

FrontController 패턴

모든 요청을 처리하는 서블릿을 만든다 > 중복 없애고 개발 집중

FrontController를 사용할 파일

<%@ page language="java" contentType="text/html; charset=EUC-KR"
	pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>

	<!-- insert누르면 insert.do 요청 -->
	<a href="insert.do">insert</a>
	<hr />
	<a href="http://localhost:8181<%=request.getContextPath()%>/update.do">update</a>
	<hr />
	<a href="http://localhost:8181/jsp_25_2_ex1_frontex/select.do">select</a>
	<hr />
	<a href="<%=request.getContextPath()%>/delete.do">delete</a>

</body>
</html>

FrontController

package com.javalec.ex;

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 FrontCon
 */
//확장자 패턴 *.do
@WebServlet("*.do")
public class FrontCon extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public FrontCon() {
		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
		System.out.println("doGet");
		actionDo(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("doPost");
		actionDo(request, response);
	}

	private void actionDo(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("actionDo");

		String uri = request.getRequestURI();
		System.out.println("uri : " + uri);
		String conPath = request.getContextPath();
		System.out.println("conPath : " + conPath);

		// conPath의 길이만큼 uri를 자름 > 뒤에 요청한 파일의 이름 (.do)만 남음
		String command = uri.substring(conPath.length());
		System.out.println("command : " + command);

		// 뒤에 요청한 파일의 이름 (.do)만 남음 > 값 확인 > 모든 일 한 곳에서 처리
		if (command.equals("/insert.do")) {
			System.out.println("insert");
			System.out.println("----------------");
		} else if (command.equals("/update.do")) {
			System.out.println("update");
			System.out.println("----------------");
		} else if (command.equals("/select.do")) {
			System.out.println("select");
			System.out.println("----------------");
		} else if (command.equals("/delete.do")) {
			System.out.println("delete");
			System.out.println("----------------");
		}
	}

}

Command 패턴

1. 하나의 서블릿에서 모든 요청을 받고
2. 그 서블릿을 인터페이스로 받는 다른 클래스에서 일을 처리한다
3. DAO로 접근해서 로직을 수행한다.

<%@ page language="java" contentType="text/html; charset=EUC-KR"
	pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
	<!-- @WebServlet("*.do")으로 FrontController가 받는다 -->
	<a href="membersAll.do">전체 회원 정보 조회</a>

</body>
</html>

package com.javalec.ex;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Timestamp;
import java.util.ArrayList;

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 FrontCon
 */
@WebServlet("*.do")
public class FrontCon extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FrontCon() {
        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
		System.out.println("doGet");
		actionDo(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("doPost");
		actionDo(request, response);
	}
	
	private void actionDo(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("actionDo");
		
		String uri = request.getRequestURI();
		String conPath = request.getContextPath();
		String command = uri.substring(conPath.length());
		
		if(command.equals("/membersAll.do")) {
			response.setContentType("text/html; charset=EUC-KR");
			PrintWriter writer = response.getWriter();
			writer.println("<html><head></head><body>");
			
			//작업 넘기기
			Service service = new MembersAllService();
			ArrayList<MemberDto> dtos = service.execute(request, response);
			
			for (int i = 0; i < dtos.size(); i++) {
				MemberDto dto = dtos.get(i);
				String id = dto.getId();
				String pw = dto.getPw();
				String name = dto.getName();
				String eMail = dto.geteMail();
				Timestamp rDate = dto.getrDate();
				String address = dto.getAddress();
				
				writer.println(id + ", " + pw + ", " + name + ", " + eMail + ", " + rDate.toLocalDateTime() + ", " + address + "<hr />");
			}
			
			writer.println("</body></html>");
		}
		
	}

}

Author And Source

이 문제에 관하여(JSP| 💔FrontController 패턴과 Command 패턴), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://velog.io/@kji306301/JSP-FrontController-패턴과-Command-패턴

우수한 개발자 콘텐츠 발견에 전념 (Collection and Share based on the CC Protocol.)

JSP| 💔FrontController 패턴과 Command 패턴

FrontController 패턴

Command 패턴

Author And Source

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