[Spring] Spring 프레임워크(7) - Context분리와 전략

[Context분리와 전략]

지금까지 하나의 Context를 사용했었다.

그러나 일반적으로 두가지로 나눠서 사용한다.

• Servlet Context: DispatcherServlet(웹의 요청을 최초로 접수, 설정파일을 이용해서 ServletContext 즉, 스프링 컨테이너 로딩), Spring-MVC와 관련 있는 빈(Controllers, ViewResolver, HandlerMapping 등)을 설정
• Root Context: Spring-MVC와 분리되어 빈을 관리하고 싶을때(Services빈이나 Repositories빈 등), 오픈API를 서비스하고 싶은 경우

- web.xml에서 설정이 필요

리스너(listener) 생성(스프링 컨테이너를 별도로 띄우는 역할)

 

[Root Application Context]

: 전체 계층 구조에서 최상단에 위치한 컨텍스트

 

- 특징

• 서로 다른 서블릿 컨텍스트에서 공유해야하는 빈들을 등록
• DB연결이나, 로깅기능
• Servlet Context에 등록된 빈 이용 불가능
• 둘다 등록되어 있다면 Servlet Context 빈이 우선된다.
• include-filter 사용

[Servlet Application Context]

• 서블릿에서만 이용되는 컨텍스트
• exclude-filter 사용

 

ex. Context 

-web.xml에 리스너 추가

 	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>	
	</listener>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<!-- 물리적 구분, 그러나 하나의 컨테이너에 올라간다. -->
		<param-value>
			/WEB-INF/spring/*.xml
		</param-value>
	</context-param>
 

-servlet-context.xml 수정

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<context:component-scan base-package="kr.co.acomp.hello" use-default-filters="false">
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>

	<mvc:annotation-driven/>
	
	<!-- 해당 url로 접근되면 dispatcher가 컨트롤러가 아닌 해당 파일을 찾는다. -->
	<mvc:resources location="/WEB-INF/resources/" mapping="/resources/**"/>
	
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize" value="104857600"></property>
		<property name="defaultEncoding" value="UTF-8"></property>
	</bean>
	
	<bean id="viewResolver" 
	class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
</beans>

-root-context.xml 생성

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<context:component-scan base-package="kr.co.acomp.hello">
		<!-- controller 타입은 배체 -->
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>

</beans>

-datasource.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">


	<context:property-placeholder location="classpath:config/database.properties"/>
	
	<bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
		<property name="driverClass" value="${db.driverClass}" />
		<property name="url" value="${db.url}" />
		<property name="username" value="${db.username}" />
		<property name="password" value="${db.password}" />
	</bean>

</beans>

- spring explorer로 확인 가능

컨텍스트(스프링 컨테이너)가 생성한 빈들