参考：官方文档
1 Aware接口
Aware 的本意是感知。当bean实现了对应的Aware接口，BeanFactory 就会在产生这个bean的时候根据对应的Aware接口，给这个bean注入相应的属性，这样bean就能够获取外界资源的引用了。
1.1 ApplicationContextAware 和 BeanNameAware
1.1.1 ApplicationContextAware接口
当一个bean实现了org.springframework.context.ApplicationContextAware接口，那么这个实力bean就会被注入ApplicationContext对象，下面是这个接口的定义：
public interface ApplicationContextAware {
void setApplicationContext(ApplicationContext applicationContext) throws BeansException;
}
使用它的一个例子：
@Component
public class BeanA implements ApplicationContextAware {
private ApplicationContext ctx;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.ctx = applicationContext;
}
// ...
}
从Spring 2.5开始，可以通过@Autowired自动注入ApplicationContext对象：
@Component
public class BeanA {
@Autowired
private ApplicationContext applicationContext;
// ...
}
1.1.2 BeanNameAware接口
在bean 的内部，它是不知道容器给自己取的id是什么。当一个bean实现了org.springframework.beans.factory.BeanNameAware接口，就可以在创建这个bean的时候将id注入进来。下面是该接口的定义：
public interface BeanNameAware {
void setBeanName(String name) throws BeansException;
}
这些回调是在属性填充完毕之后，在初始化回调之前调用。
1.2 其它的Aware接口
Spring还提供了一些很重要的Aware接口，这些接口的命名规则就是根据需要依赖的属性来命名的：
| 接口 | 注入的属性 | Explained in… |
|---|---|---|
ApplicationContextAware |
Declaring ApplicationContext. |
ApplicationContextAware and BeanNameAware |
ApplicationEventPublisherAware |
Event publisher of the enclosing ApplicationContext. |
Additional Capabilities of the ApplicationContext |
BeanClassLoaderAware |
Class loader used to load the bean classes. | Instantiating Beans |
BeanFactoryAware |
Declaring BeanFactory. |
ApplicationContextAware and BeanNameAware |
BeanNameAware |
Name of the declaring bean. | ApplicationContextAware and BeanNameAware |
BootstrapContextAware |
Resource adapter BootstrapContextthe container runs in. Typically available only in JCA aware ApplicationContextinstances. |
JCA CCI |
LoadTimeWeaverAware |
Defined weaver for processing class definition at load time. | Load-time Weaving with AspectJ in the Spring Framework |
MessageSourceAware |
Configured strategy for resolving messages (with support for parametrization and internationalization). | Additional Capabilities of the ApplicationContext |
NotificationPublisherAware |
Spring JMX notification publisher. | Notifications |
ResourceLoaderAware |
Configured loader for low-level access to resources. | Resources |
ServletConfigAware |
Current ServletConfig the container runs in. Valid only in a web-aware Spring ApplicationContext. |
Spring MVC |
ServletContextAware |
Current ServletContext the container runs in. Valid only in a web-aware Spring ApplicationContext. |
Spring MVC |