struts2自动删除上传的临时tmp文件设置。

在web.xml中添加过滤器
<filter>
       <filter-name>struts-cleanup</filter-name>
       <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
   </filter>
   <filter-mapping>
       <filter-name>struts-cleanup</filter-name>
       <url-pattern>*.action</url-pattern>
</filter-mapping>