web.xml上监听器作用

<!--Spring ApplicationContext 载入 -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- 使Spring支持request与session的scope,如:<bean id="loginAction" class="com.foo.LoginAction" scope="request"/> -->
<listener>
  <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>

<!-- Spring 刷新Introspector防止内存泄露 -->
<listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/config/application-context.xml
            /WEB-INF/config/cache-context.xml
            /WEB-INF/config/captcha-context.xml
            /WEB-INF/config/jeecore-context.xml
            /WEB-INF/config/jeecms-context.xml
        </param-value>
    </context-param>

和

<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

一起用