Spring容器的问题 day06(第一知识点)

以你之姓@ 2022-02-21 12:25 82阅读 0赞

**Spring root容器（父容器）**  
**SpringMVC容器**

【总结】  
**1.web.xml配置父容器（Root WebApplicationContext）**  
该容器包含Services、dataSource等等.  
也就是说明数据源、事务等都要配置到父容器中；

<context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:spring-root.xml</param-value>
       </context-param>
       <listener>
         <listener-class>
         org.springframework.web.context.ContextLoaderListener
         </listener-class>
       </listener>

**2.web.xml配置springmvc容器(Servlet WebApplicationContext)**  
该容器包含：Controller、RestController、ControllerAdvice、HnadlerMapping、视图解析器

<servlet>
        <servlet-name>et1812</servlet-name>
        <servlet-class>
          org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>et1812</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>

**3.对两个容器扫描的bean进行隔离**  
**3.1.spring-root.xml**

<context:component-scan base-package="com.etoak">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController"/>
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
      </context:component-scan>

**3.2.spring-mvc.xml**

<context:component-scan base-package="com.etoak">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController" />
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice" />
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
      </context:component-scan>

**4.【特别注意】**  
子容器可以使用父容器的bean；  
父容器访问不到子容器的bean；