web.xml中 listener，filter，servlet需按顺序。

<listener>
<listener-class>listener.VisitCountListener</listener-class>
</listener>

<filter>
<filter-name>LoginCheckFilter</filter-name>
<filter-class>filter.LoginCheckFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>LoginCheckFilter</filter-name>
<url-pattern>/secure/*</url-pattern>
</filter-mapping>

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