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ApplicationContext 这个接口作为作为spring框架下最重要的一个接口他提供了能力结构图如上。

他自己提供了以下方法

public interface ApplicationContext extends EnvironmentCapable, ListableBeanFactory, HierarchicalBeanFactory,		MessageSource, ApplicationEventPublisher, ResourcePatternResolver {	/**	 * 返回这个context的唯一id	 */	@Nullable	String getId();	/**	 * 返回这个context所属的应用名称	 */	String getApplicationName();	/**	 * 返回一个context名称	 */	String getDisplayName();	/**	 * 返回context加载的时间	 */	long getStartupDate();	/**	 * 返回级的上下文	 */	@Nullable	ApplicationContext getParent();	/**	 * 公开AutowireCapableBeanFactory接口的能力给到context	 * 
This is not typically used by application code, except for the purpose of	 * initializing bean instances that live outside of the application context,	 * applying the Spring bean lifecycle (fully or partly) to them.	 * 
Alternatively, the internal BeanFactory exposed by the	 * {@link ConfigurableApplicationContext} interface offers access to the	 * {@link AutowireCapableBeanFactory} interface too. The present method mainly	 * serves as a convenient, specific facility on the ApplicationContext interface.	 * 
NOTE: As of 4.2, this method will consistently throw IllegalStateException	 * after the application context has been closed. In current Spring Framework	 * versions, only refreshable application contexts behave that way; as of 4.2,	 * all application context implementations will be required to comply.	 * @return the AutowireCapableBeanFactory for this context	 * @throws IllegalStateException if the context does not support the	 * {@link AutowireCapableBeanFactory} interface, or does not hold an	 * autowire-capable bean factory yet (e.g. if {@code refresh()} has	 * never been called), or if the context has been closed already	 * @see ConfigurableApplicationContext#refresh()	 * @see ConfigurableApplicationContext#getBeanFactory()	 */	AutowireCapableBeanFactory getAutowireCapableBeanFactory() throws IllegalStateException;

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