spring3引文方式无法注入servlet和filter

spring3注解方式无法注入servlet和filter
filter和servlet不受spring管理，所以不能依赖注入spring管理的bean,在servlet里的init方法加入如下代码：private XxxxService xxxxService;WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(config.getServletContext());xxxxService= (XxxxService) wac.getBean("xxxxService");即可获得spring管理的bean.filter代码如下：wac?= WebApplicationContextUtils.getRequiredWebApplicationContext(config.getServletContext());xxxxService= (XxxxService) wac.getBean("xxxxService");