您如何在JSP中定义多个过滤器？
您的Web应用程序可能会针对特定目的定义几个不同的过滤器。考虑一下，您定义了两个过滤器AuthenFilter和LogFilter。剩下的过程将如上，除非您需要创建其他映射，如下-
<filter>
<filter-name>LogFilter</filter-name>
<filter-class>LogFilter</filter-class>
<init-param>
<param-name>test-param</param-name>
<param-value>Initialization Paramter</param-value>
</init-param>
</filter>
<filter>
<filter-name>AuthenFilter</filter-name>
<filter-class>AuthenFilter</filter-class>
<init-param>
<param-name>test-param</param-name>
<param-value>Initialization Paramter</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>LogFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>AuthenFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>筛选申请单
web.xml中过滤器映射元素的顺序确定了Web容器将过滤器应用于servlet或JSP的顺序。要颠倒过滤器的顺序，您只需要颠倒web.xml文件中的过滤器映射元素。
例如，上面的示例将首先应用LogFilter，然后将AuthenFilter应用到任何servlet或JSP；以下示例将颠倒顺序-
<filter-mapping> <filter-name>AuthenFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>LogFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>