Spring IOC
	BeanFactory支持的生命周期的顺序
		BeanNameAware#setBeanName
		BeanClassLoaderAware#setBeanClassLoader
		BeanFactoryAware#setBeanFactory
		ResourceLoaderAware#setResourceLoader
		ApplicationEventPublisherAware#setApplicationEventPublisher
		MessageSourceAware#setMessageSource
		ApplicationContextAware#setApplicationContext
		ServletContextAware#setServletContext
		BeanPostProcessors#postProcessBeforeInitialization
		InitializingBean#afterPropertiesSet
		a custom init-method definition
		BeanPostProcessors#postProcessAfterInitialization
		DisposableBean#destroy
		a custom destroy-method definition

	BeanFactory有三个直接子类接口:
		ListableBeanFactory
			可枚举的BeanFactory
			1.从这个工厂接口开始,可以枚举列出工厂可以生产的所有实例.即可以只查找beanName,也可以查找对应的对象实例.
			2.从这个工厂接口开始,BeanDefinition登场了.
			3.注意如果是一个层次继承的工厂,则只会列出当前工厂的实例,而不会列出祖先层的实例
		HierarchicalBeanFactory
			可分层次的BeanFactory
		AutowireCapableBeanFactory
			可自动装配的BeanFactory