Sping+Struts2+Hibernate中如何用main方法实例化dao或service

demo1

public static void main(String[] args) {

    ApplicationContext context = new ClassPathXmlApplicationContext(  
            new String[] {"applicationContext.xml"});  
    SessionFactory sessionFactory=(SessionFactory)context.getBean("sessionFactory");
    UserDaoImpl userDao=(UserDaoImpl) context.getBean("userDaoImpl");
    userDao.setSessionFactory(sessionFactory);
    List<User> list = userDao.getAllUser();

}

demo1对appliactionContext.xml是零配置后非零配置都可以使用但userDaoImpl中必须有

    protected SessionFactory sessionFactory;

    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

demo2

1. public static void main(String[] args) {  
2.     ApplicationContext context = new ClassPathXmlApplicationContext(  
3.             new String[] {"ApplicationContext.xml"});  
4.     BeanFactory factory = (BeanFactory) context;  
5.   
6.     UserService userService = (UserService)factory.getBean("userService");
   
7. }
8. demo2在零配置中不能使用,xml文件不找不到userService有关的配置必须采用非零配置才可以