1.1ApplicationContextAware接口作用
1.2ApplicationContextAware接口源码
package org.springframework.context;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.Aware;
/**
* Interface to be implemented by any object that wishes to be notified
* of the {@link ApplicationContext} that it runs in.
*
* <p>Implementing this interface makes sense for example when an object
* requires access to a set of collaborating beans. Note that configuration
* via bean references is preferable to implementing this interface just
* for bean lookup purposes.
*
* <p>This interface can also be implemented if an object needs access to file
* resources, i.e. wants to call {@code getResource}, wants to publish
* an application event, or requires access to the MessageSource. However,
* it is preferable to implement the more specific {@link ResourceLoaderAware},
* {@link ApplicationEventPublisherAware} or {@link MessageSourceAware} interface
* in such a specific scenario.
*
* <p>Note that file resource dependencies can also be exposed as bean properties
* of type {@link org.springframework.core.io.Resource}, populated via Strings
* with automatic type conversion by the bean factory. This removes the need
* for implementing any callback interface just for the purpose of accessing
* a specific file resource.
*
* <p>{@link org.springframework.context.support.ApplicationObjectSupport} is a
* convenience base class for application objects, implementing this interface.
*
* <p>For a list of all bean lifecycle methods, see the
* {@link org.springframework.beans.factory.BeanFactory BeanFactory javadocs}.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Chris Beams
* @see ResourceLoaderAware
* @see ApplicationEventPublisherAware
* @see MessageSourceAware
* @see org.springframework.context.support.ApplicationObjectSupport
* @see org.springframework.beans.factory.BeanFactoryAware
*/
public interface ApplicationContextAware extends Aware {
/**
* Set the ApplicationContext that this object runs in.
* Normally this call will be used to initialize the object.
* <p>Invoked after population of normal bean properties but before an init callback such
* as {@link org.springframework.beans.factory.InitializingBean#afterPropertiesSet()}
* or a custom init-method. Invoked after {@link ResourceLoaderAware#setResourceLoader},
* {@link ApplicationEventPublisherAware#setApplicationEventPublisher} and
* {@link MessageSourceAware}, if applicable.
* @param applicationContext the ApplicationContext object to be used by this object
* @throws ApplicationContextException in case of context initialization errors
* @throws BeansException if thrown by application context methods
* @see org.springframework.beans.factory.BeanInitializationException
*/
void setApplicationContext(ApplicationContext applicationContext) throws BeansException;
}
2.1Aware接口作用
2.1Aware接口源码
package org.springframework.beans.factory;
/**
* Marker superinterface indicating that a bean is eligible to be
* notified by the Spring container of a particular framework object
* through a callback-style method. Actual method signature is
* determined by individual subinterfaces, but should typically
* consist of just one void-returning method that accepts a single
* argument.
*
* <p>Note that merely implementing {@link Aware} provides no default
* functionality. Rather, processing must be done explicitly, for example
* in a {@link org.springframework.beans.factory.config.BeanPostProcessor BeanPostProcessor}.
* Refer to {@link org.springframework.context.support.ApplicationContextAwareProcessor}
* and {@link org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory}
* for examples of processing {@code *Aware} interface callbacks.
*
* @author Chris Beams
* @since 3.1
*/
public interface Aware {
}