ServletContextListener的实现类中如何获取Spring配置中的bean

示例代码如下：

 

public class Test implements ServletContextListener {

  public IMessageService messageService;

  public void setMessageService(IMessageService messageService) {
      this.messageService = messageService;
  }

  public void contextInitialized(ServletContextEvent sce) {
      ApplicationContext ac = null;

      ac = WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext ());

      setMessageService ((IMessageService) ac.getBean ("MessageServiceImpl"));
  }

}