Servlet url-pattern规则

* Exact match (/foo)绝对匹配
* Path match (/foo/*)部分匹配
* Extension match (*.foo)后缀匹配
* Default servlet (/) which is useful only for servlet mappings

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

如果pattern写成/foo/或者 /*.jsp或者*/foo等等都是无效的url-pattern

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