參考網址：http://www.cnblogs.com/sophine/archive/2013/07/18/3199289.html
>>> FilterDispatcher <<< is deprecated! Please use the new filters!
在struts2.3.7下，web.xml中使用
會出現
***********************************************************************
* 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 *
* *
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原因在於:
Class FilterDispatcher
Deprecated. Since Struts 2.1.3, use StrutsPrepareAndExecuteFilter instead or StrutsPrepareFilterand StrutsExecuteFilter if needing using the ActionContextCleanUp filter in addition to this one
解決方法，將web.xml上述代碼改爲：
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
<init-param>
<param-name>struts.action.extendion</param-name>
<param-value>action</param-value>
</init-param>
</filter>