DelegatingFilterProxy用法

org.springframework.web.filter.DelegatingFilterProxy

在web.xml中注册，当自定义的Filter需要用到spring管理的对象时，用到该代理(否则空指针)

自定义的Filter用<bean>标签注册，而不再在web.xml中配置

<filter>
    <filter-name>testfilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    <init-param>
        <param-name>targetFilterLifecycle</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
 <filter-mapping>
    <filter-name>testfilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<bean id="testfilter" class="com.test.TestFilter"></bean>

filter-name需与bean-id对应