struts2中错误提示：There is no Action mapped for namespace / and action name
当在struts2中运行时出现如上所述错误时:
1.在src目录下创建struts.xml一定要注意拼写
2.struts.xml文件中引入和extend是否正确
3.在web.xml 中<welcome-file>中时候配置了自己的启动页面。
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