Spring - MVC @EnableWebMvc

Spring MVC - @EnableWebMvc

• 애노테이션 기반 Spring MVC를 사용할때 편리한 웹 MVC 기본 설정 방법

@EnableWebMvc

 

 

• DelegatingWebMvcConfiguration

  • EnableWebMvc 애노테이션을 사용하면 DelegatingWebMvcConfiguration 을 Import 한다.
  • DelegatingWebMvcConfiguration 은 WebMvcConfigurationSupport를 상속받고있다.
  • 다양한 Bean 설정이 등록 되어있다.

DelegatingWebMvcConfiguration

WebMvcConfigurationSupport

 

 

• WebApplication.java

  • EnableWebMvc 를 사용하기 이전에 추가적인 설정이 필요하다.
  • EnableWebMvc 에서 ServletContext를 종종 참조하기때문에
  • ApplicationContext에 ServletContext를 등록해주어야 제대로 동작한다.

package me.june;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

/**
 * Created by IntelliJ IDEA.
 * User: june
 * Date: 2019-07-11
 * Time: 20:31
 **/
public class WebApplication implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext();
        // EnableWebMvc 사용시 필수 
        applicationContext.setServletContext(servletContext);
        // WebConfig.class를 설정 클래스로 지정
        applicationContext.register(WebConfig.class);
        applicationContext.refresh();

        // DispatcherServlet을 등록
        DispatcherServlet dispatcherServlet = new DispatcherServlet(applicationContext);
        ServletRegistration.Dynamic app = servletContext.addServlet("app", dispatcherServlet);
        app.addMapping("/app/*");
    }
}

• WebConfig.java
  • @EnableWebMvc 사용

package me.june;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

/**
 * Created by IntelliJ IDEA.
 * User: june
 * Date: 2019-07-07
 * Time: 23:14
 **/
@Configuration
@ComponentScan(excludeFilters = {@ComponentScan.Filter(Service.class), @ComponentScan.Filter(Repository.class)})
@EnableWebMvc
public class WebConfig {

    @Bean
    public ViewResolver viewResolver () {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/WEB-INF/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }
}

• EnableWebMvc를 사용할 경우 Bean 설정
  • HandlerMapping
    • RequestMappingHandlerMapping의 우선순위가 더 높아진다.
  • Interceptors
    • 기존에는 없었던 2개의 interceptor가 등록된다.
    • ConversionServiceExposingInterceptor
      • spring:eval 태그를 jsp에서 사용할수있도록 해줌
    • ResourceUrlProviderExposingInterceptor
  • HandlerAdapter
    • RequestMappingHandlerAdapter 의 우선순위가 더 높아진다.
  • ...