Web.xml需要配置的代码

<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>