在 web.xml 文件中指定了struts-config-registration.xml：
...
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml, /WEB-INF/struts-config-registration.xml</param-value>
</init-param>
...
在文件：struts-config-registration.xml 中指定了editRegistration:
...
<action path="/editRegistration"
type="org.apache.struts.webapp.example.EditRegistrationAction"
attribute="registrationForm"
scope="request"
validate="false">
<forward name="success" path="/registration.jsp"/>
</action>
...