ServletFileUpload.parseRequest()为空

项目中上传时ServletFileUpload.parseRequest()取值为空原来是struts2的过滤器拦截问题

1. <filter>  
2.   <filter-name>struts2</filter-name>  
3.   <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>  
4.  </filter>  
5.  <filter-mapping>  
6.   <filter-name>struts2</filter-name>  
7.   <url-pattern>/*</url-pattern>  
8.  </filter-mapping> 

里面的/*改为*.action便可