web.xml配置如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	
	<filter>
	    <filter-name>struts2</filter-name>
	    <filter-class>
	         org.apache.struts2.dispatcher.FilterDispatcher
	    </filter-class>
	</filter>
	
	<filter-mapping>
	    <filter-name>struts2</filter-name>
	    <url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<listener>
	    <listener-class>
	         org.springframework.web.context.ContextLoaderListener
	    </listener-class>
	</listener>
	
  <display-name></display-name>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

出现如下的警告


*                                                                     *
* >>> FilterDispatcher <<< is deprecated! Please use the new filters! *
*                                                                     *
*           This can be a source of unpredictable problems!           *
*                                                                     *
*              Please refer to the docs for more details!             *
*            http://struts.apache.org/2.x/docs/webxml.html            *
*                                                                     *
***********************************************************************




***********************************************************************
*                               WARNING!!!                            *
*                                                                     *
* >>> FilterDispatcher <<< is deprecated! Please use the new filters! *
*                                                                     *
*           This can be a source of unpredictable problems!           *
*                                                                     *
*              Please refer to the docs for more details!             *
*            http://struts.apache.org/2.x/docs/webxml.html            *
*                                                                     *
***********************************************************************




***********************************************************************
*                               WARNING!!!                            *
*                                                                     *
* >>> FilterDispatcher <<< is deprecated! Please use the new filters! *
*                                                                     *
*           This can be a source of unpredictable problems!           *
*                                                                     *
*              Please refer to the docs for more details!             *
*            http://struts.apache.org/2.x/docs/webxml.html            *
*                                                                     *
***********************************************************************




***********************************************************************
*                               WARNING!!!                            *
*                                                                     *
* >>> FilterDispatcher <<< is deprecated! Please use the new filters! *
*                                                                     *
*           This can be a source of unpredictable problems!           *
*                                                                     *
*              Please refer to the docs for more details!             *
*            http://struts.apache.org/2.x/docs/webxml.html            *
*                                                                     *
***********************************************************************

将web.xml其中改一下

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	
	<filter>
	    <filter-name>struts2</filter-name>
	    <filter-class>
	         org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
	    </filter-class>
	</filter>
	
	<filter-mapping>
	    <filter-name>struts2</filter-name>
	    <url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<listener>
	    <listener-class>
	         org.springframework.web.context.ContextLoaderListener
	    </listener-class>
	</listener>
	
  <display-name></display-name>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

修改了filter-class,这个警告就没有了