[MAVEN] SpringMVC 버전 1

🔍 DispatcherServlet

개발자가 직접 만든 DispatcherServlet을 사용. 이는 프론트 컨트롤러 역할을 수행하며 멤버변수 초기화, 생성자, Setter, 어노테이션, 의존 주입, init() 메서드 등을 포함한다.

package com.spring.controller.common;

import java.io.IOException;

import org.springframework.stereotype.Controller;

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

public class DispatcherServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	private HandlerMapping handler;
	private ViewResolver viewResolver;

	// init-method="init"
	// 1. 멤버변수 초기화하는 역할
	// 2. 생성자
	// 3. setter
	// 4. @Autowired
	// 5. DI(의존주입)
	// 6. init() 메서드
	public void init() {
		handler=new HandlerMapping();
		viewResolver=new ViewResolver();
		viewResolver.setPrefix("./");
		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 {

		String uri=request.getRequestURI();
		String cp=request.getContextPath();
		String commend=uri.substring(cp.length());
		System.out.println("FC : "+commend);

		Controller controller=handler.getController(commend);
		/*
		ModelAndView mav = controller.handleRequest(request, response);

		if(!mav.getViewName().contains(".do")) {
			mav.setViewName(viewResolver.getView(mav.getViewName()));
		}
		response.sendRedirect(mav.getViewName());
		*/

	}
}

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🔍 Controller

개발자가 직접 만든 Controller 인터페이스를 사용하며, ViewResolver가 등장하기 전에는 ActionForward를 사용했다.

package com.spring.controller.common;

import java.io.IOException;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

// Action
public interface Controller {

	// ActionForward → String
	String execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;
	
}

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🔍 HandlerMapping 

개발자가 직접 만든 HandlerMapping을 사용하여 DI로 생성자 주입을 통해 사용했다.

package com.spring.controller.common;

import java.util.HashMap;
import java.util.Map;

import org.springframework.stereotype.Controller;

public class HandlerMapping {
	private Map<String,Controller> mappings;
	
	public HandlerMapping() {
		mappings=new HashMap<String,Controller>();
		
		//mappings.put("/login.do", new LoginController());
		//mappings.put("/main.do", new MainController());
	}
	
	public Controller getController(String commend) {
		return mappings.get(commend);
	}
}

 

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🔍 ViewResolver

개발자가 직접 만든 ViewResolver를 사용하며, DI로 setter 주입을 사용했다.

 

package com.spring.controller.common;

// ActionForward 가 필요없어짐!
public class ViewResolver {
	public String prefix;
	public String suffix;
	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}
	public void setSuffix(String suffix) {
		this.suffix = suffix;
	}
	
	public String getView(String view) {
		return prefix+view+suffix;
	}
}

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