如何在filter中注入bean

web.xml配置一个 <filter> <filter-name>DelegatingFilterProxy</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> <init-param> <param-name>targetBeanName</param-name> <param-value>myFilter</param-value> </init-param> <init-param> <param-name>targetFilterLifecycle</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>DelegatingFilterProxy</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> applicationcontext.xml配置: <bean id="myFilter" class="skycncomp.util.CookieFilter"> <property name="userDao"> <ref bean="userDao"/> </property> </bean> <bean id="userDao" class="skycncomp.UserDAO"> </bean>