url-pattern标签

http://127.0.0.1:8080/sscif/pages/sscif/userinfo/add.jsp

Tomcat首先把http://127.0.0.1:8080/sscif截取下来，剩下的/pages/sscif/userinfo/add.jsp用来做映射。

完全匹配

完全匹配就是等值匹配，例如：

<url-pattern>/pages/sscif/userinfo/add.jsp<url-pattern/>

路径匹配

<url-pattern>/*<url-pattern/>这种的话，无论http://127.0.0.1:8080/sscif/后面跟着什么，都匹配

扩展名匹配

<url-pattern>*.action<url-pattern/>

<url-pattern>*.jsp<url-pattern/>

这种就匹配具体的后缀名字，即*.xxxx中的xxxx

**/与/*区别**

<url-pattern>/<url-pattern/>匹配类似于/xxxx的URL，不会匹配到/xxx.xxx类型的URL

<url-pattern>/*<url-pattern/>会匹配所有类型、所有后缀的URL，包括：/xxx、/xxx.xxx

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