There is no Action mapped for namespace / and action name AjaxServlet. - [unknow

There is no Action mapped for namespace / and action name AjaxServlet. - [unknown location]

原因：web.xml中配置struts拦截为/*，AjaxServlet被拦截掉

<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>

 <servlet>
    <description></description>
    <display-name>AjaxServlet</display-name>
    <servlet-name>AjaxServlet</servlet-name>
    <servlet-class>org.CollegePro.ssh.web.servlet.AjaxServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>AjaxServlet</servlet-name>
    <url-pattern>/AjaxServlet</url-pattern>
  </servlet-mapping>

解决办法：修改struts的过滤器设置，如下。只对.aciton结尾的请求和.jsp结尾请求过滤，这样就可以保证Ajax的过滤器能正常使用。

  <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>*.action</url-pattern>
  </filter-mapping>
   <filter-mapping>
   <filter-name>struts2</filter-name>
   <url-pattern>*.jsp</url-pattern>
  </filter-mapping>