SpringMVC 与Spring 整合细节

SpringMVC依赖于Spring，但是利用SpringIOC配置其他bean的时候回被初始化两次

web.xml同时配置SpringMVC Servlet过滤和Spring的过滤器

<!-- spring配置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:bean.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- SpringMVC配置 -->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

这样实体会被初始化两次，解决办法：SpringMVC配置与Spring配置过滤掉扫描的注解

SpringMVC配置

<context:component-scan base-package="cn.liangqinghai" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
    </context:component-scan>

其中use-default-filters="false"尤为重要，忽略掉缺省的过滤器

Spring配置

<context:component-scan base-package="cn.liangqinghai">
          <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
          <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
      </context:component-scan>