过滤器高级拦截
1 2 <filter-mapping> 3 <filter-name>FilterDemo3</filter-name> 4 <url-pattern>/*</url-pattern> 5 <dispatcher>REQUEST</dispatcher> 默认情况。如果写了另外一种情况，默认的就没有了 6 <dispatcher>FORWARD</dispatcher> 7 <dispatcher>INCLUDE</dispatcher> 8 <dispatcher>ERROR</dispatcher> 9 </filter-mapping>
