本文介绍了在web.xml中配置过滤器时可能出现的问题：如果filter和filter-mapping的顺序错误，会导致服务器无法识别filter名称。正确的顺序应该是先定义filter再进行filter-mapping。
<filter-mapping> <filter-name>adminOperateLogFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>adminOperateLogFilter</filter-name> <filter-class>com.berheley.exam.web.filter.AdminOperateLogFilter</filter-class> </filter>这样写启动服务器时报错 Filter mapping specifies an unknown filter name adminOperateLogFilter
将这两块换个顺序就没问题了，web.xml信息的加载是有顺序的，filter在mapping之前必须要让服务器找到其定义。
<filter> <filter-name>adminOperateLogFilter</filter-name> <filter-class>com.berheley.exam.web.filter.AdminOperateLogFilter</filter-class> </filter> <filter-mapping> <filter-name>adminOperateLogFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
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