如何用Spring将Service注入到Servlet中

在applicationContextxml中定义数据层访问Bean：
<bean id="userDao" class="testUserDaoImpl"></bean>
public class MyServlet extends >如何在Java Filter 中注入 Service
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// 初始化方法
ServletContext sc = filterConfiggetServletContext();
XmlWebApplicationContext cxt = (XmlWebApplicationContext)WebApplicationContextUtilsgetWebApplicationContext(sc);
if(cxt != null && logManager == null)
logManager = (LogManager)cxtgetBean("logManager");
}

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