Servlet如何定义多个过滤器呢？

通常我们将不同功能的过滤器放入不同的Class类中，这样就会出现一个项目包含了很多过滤器，
那么此时我们只需在web.xml配置多个过滤器即可，具体的配置如下例所示:

例:
    Filter1,Filter2两个过滤器

<filter>
   <filter-name>Filter1</filter-name>
   <filter-class>com.java265.test.Filter1</filter-class>
   <init-param>
      <param-name>param1</param-name>
      <param-value>value1</param-value>
   </init-param>
</filter>

<filter>
   <filter-name>Filter2</filter-name>
   <filter-class>com.java265.test.Filter2</filter-class>
   <init-param>
      <param-name>param2</param-name>
      <param-value>value2</param-value>
   </init-param>
</filter>

<filter-mapping>
   <filter-name>Filter1</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>

<filter-mapping>
   <filter-name>Filter2</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>