Web.xml文件配置将过滤全部请求修改为指定请求:

<filter>
		<filter-name>ProjectFilter</filter-name>
		<filter-class>com.itcast.xml.filter.ProjectFilter</filter-class>
		<init-param>
			<param-name>passUrl</param-name>
			<param-value>index.jsp;login.html;regist.html;</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>ProjectFilter</filter-name>
		<!-- 防止过滤掉图片等安全静态资源请求 -->
		<url-pattern>*.do(*.jsp)</url-pattern>
		<!--<url-pattern>/*</url-pattern>-->
	</filter-mapping>
</filter>