[Spring] doAction - 응답(페이지 이동)

응답이 2가지로 온다

 

 

 

 

get view를 한다.

줄일 수 있다.

 

 

 

---

package com.koreait.app.view.controller;

import java.io.IOException;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@WebServlet("*.do")
public class DispatcherServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private HandlerMapping handlerMapping;
	private ViewResolver viewResolver;
       
    public DispatcherServlet() {
        super();
    }
    
    public void init() {
    	this.handlerMapping = new HandlerMapping();
    	this.viewResolver = new ViewResolver();
    	this.viewResolver.setPrefix("./");
    	this.viewResolver.setSuffix(".jsp");
    }    

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doAction(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doAction(request, response);
	}
	
	private void doAction(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// 1. 사용자(클라이언트,브라우저)의 요청 추출
		String uri=request.getRequestURI();
		String command=uri.substring(uri.lastIndexOf("/"));
		
		// 2. 요청에 해당하는 Controller 기능을 수행
		Controller controller=this.handlerMapping.getController(command);
								// 팩토리 패턴을 활용하는 handlerMapping
		String path=controller.execute(request, response);
		
		// 3. 응답(페이지 이동)
		if(!path.contains(".do")) {
			path=this.viewResolver.getView(path);
		}
		response.sendRedirect(path);
	}
}