Spring BeanFactoryAware和ApplicationContextAware有什么区别？

Question

两者都可以用来获取bean实例，但哪一个更适合用来实现？

Answer 1

If you need a reference to the BeanFactory , then use BeanFactoryAware . If you need a reference to the ApplicationContext , then use ApplicationContextAware .

Note that the ApplicationContext interface is a subclass of BeanFactory , and provides additional methods on top of the basic BeanFactory interface.

If all you need to do is call getBean() , then BeanFactory is sufficient.

Note also that Spring 2.5+ provides a nicer way of getting yourself wired with a BeanFactory or ApplicationContext , eg

private @Autowired ApplicationContext appContext;
private @Autowired BeanFactory beanFactory;

No need for the XyzAware interfaces.

Answer 2

An ApplicationContext is an extended version of a BeanFactory and therefore offers additional functionalities.

So whether to use ApplicationContextAware or BeanFactoryAware boils down to the question: Do you explicitely need any of the additional ApplicationContext functionalities? If you do implement ApplicationContextAware otherwise stick to BeanFactoryAware .

Answer 3

Do you require access to the additional features available on an ApplicationContext? If so, then you should of course use ApplicationContextAware . If not, BeanFactoryAware will be sufficient.

Amongst many other things, an ApplicationContext has additional methods for inspecting the beans eg containsBeanDefinition , getBeanDefinitionCount , getBeanDefinitionNames , getBeanNamesForType , getBeansOfType that may be useful to you and which are not available on BeanFactory

I usually implement ApplicationContextAware