（自己在浏览器中，直接进入项目的根目录，即 http://localhost:8080/ssh/  时便报错，web.xml文件已经配置了 欢迎页面

  <welcome-file-list>

     <welcome-file>index.jsp</welcome-file>

   </welcome-file-list>

并且 filter-mapping设置为 所有的url

 <filter-mapping>

       <filter-name>struts2</filter-name>

       <url-pattern>/*</url-pattern>

   </filter-mapping>

其实问题是，自己无意中，将 index.jsp 文件 拖到了别的路径（应该在WebRoot 的根目录下）

网上有的人，将struts.xml 文件名 拼写错，也报该错误。

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