------------------------------------------Filter路径的匹配模式-----------------------------------------------
a、带路径的匹配
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
b、某一目录下的路径
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/sysmgr/*</url-pattern>
</filter-mapping>
c、 全局匹配
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
d、匹配某个特定的servlet
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<servlet-name>getAllUserServlet</servlet-name>
</filter-mapping>
e、匹配某一路径下的servlet
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<servlet-name>/sysmgr/getAllUserServlet</servlet-name>
</filter-mapping>