如何过滤特定目录下的某类文件?

比如要过滤/dir下的*.jsp文件

下面这样我试过不行,在tomcat4.1下


<filter-mapping>
<filter-name>aFilter</filter-name>
<url-pattern>/dir/*.jsp</url-pattern>
</filter-mapping>

(According to mighty google)

There are only four standard URL patterns (and this applies to servlet
mappings and security constraints as well as filter mappings):

* Exact match (/foo)
* Path match (/foo/*)
* Extension match (*.foo)
* Default servlet (/) which is useful only for servlet mappings

There is no legal syntax to say "all but this set of paths".

Thanks.