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23. Automatic assembly-Aware injection Spring underlying components & principle

Aware interface, which provides functions similar to callback functions

Custom components want to use some of the underlying components of the Spring container (Application Context,Bean Factory); custom components need to implement the xxxAware interface; when creating objects, the methods specified in the interface are called to inject the relevant components

Package org.springframework.beans.factory;public interface Aware {} 23.1 ApplicationContextAware Auto injection IOC Container package org.springframework.context;import org.springframework.beans.BeansException;import org.springframework.beans.factory.Aware;public interface ApplicationContextAware extends Aware {void setApplicationContext (ApplicationContext applicationContext) throws BeansException;} 23.2 ApplicationEventPublisherAware injection event dispatcher package org.springframework.context;import org.springframework.beans.factory.Aware;public interface ApplicationEventPublisherAware extends Aware {void setApplicationEventPublisher (ApplicationEventPublisher applicationEventPublisher);} 23.3 BeanClassLoaderAware classloader package org.springframework.beans.factory Public interface BeanClassLoaderAware extends Aware {void setBeanClassLoader (ClassLoader classLoader);} 23.4 BeanFactoryAware Bean Factory package org.springframework.beans.factory;import org.springframework.beans.BeansException;public interface BeanFactoryAware extends Aware {void setBeanFactory (BeanFactory beanFactory) throws BeansException;} 23.5 BeanNameAware Bean name package org.springframework.beans.factory;public interface BeanNameAware extends Aware {void setBeanName (String name);} 23.6 EmbeddedValueResolverAware Embedded value Parser package org.springframework.context;import org.springframework.beans.factory.Aware;import org.springframework.util.StringValueResolver Public interface EmbeddedValueResolverAware extends Aware {void setEmbeddedValueResolver (StringValueResolver resolver);} 23.7 EnvironmentAware environment package org.springframework.context;import org.springframework.beans.factory.Aware;import org.springframework.core.env.Environment;public interface EnvironmentAware extends Aware {void setEnvironment (Environment environment);} 23.8 ImportAware import related package org.springframework.context.annotation;import org.springframework.beans.factory.Aware;import org.springframework.core.type.AnnotationMetadata;public interface ImportAware extends Aware {void setImportMetadata (AnnotationMetadata importMetadata) } 23.9 LoadTimeWeaverAware Import related package org.springframework.context.weaving;import org.springframework.beans.factory.Aware;import org.springframework.instrument.classloading.LoadTimeWeaver;public interface LoadTimeWeaverAware extends Aware {void setLoadTimeWeaver (LoadTimeWeaver loadTimeWeaver);} 23.10 MessageSourceAware internationalization package org.springframework.context;import org.springframework.beans.factory.Aware;public interface MessageSourceAware extends Aware {void setMessageSource (MessageSource messageSource);} 23.11 NotificationPublisherAware support package org.springframework.jmx.export.notification;import org.springframework.beans.factory.Aware for sending notifications Public interface NotificationPublisherAware extends Aware {void setNotificationPublisher (NotificationPublisher notificationPublisher);} 23.12 ResourceLoaderAware resource loader package org.springframework.context;import org.springframework.beans.factory.Aware;import org.springframework.core.io.ResourceLoader;public interface ResourceLoaderAware extends Aware {void setResourceLoader (ResourceLoader resourceLoader);} 23.13 Test case package com.hw.springannotation.beans;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanNameAware;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware Import org.springframework.context.EmbeddedValueResolverAware;import org.springframework.stereotype.Component;import org.springframework.util.StringValueResolver;/** * @ Description TODO * @ Author hw * @ Date 15:44 on 2018-11-28 * @ Version 1.0 * / @ Componentpublic class Red implements ApplicationContextAware, BeanNameAware, EmbeddedValueResolverAware {private ApplicationContext applicationContext; public void setApplicationContext (ApplicationContext applicationContext) throws BeansException {System.out.println ("incoming IOC" + applicationContext); this.applicationContext = applicationContext } public void setBeanName (String name) {System.out.println ("name of current bean" + name);} public void setEmbeddedValueResolver (StringValueResolver resolver) {String value = resolver.resolveStringValue ("Hello ${os.name} I am # {20x20}"); System.out.println ("parsed string:" + value);}}

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To put it bluntly, the Aware interface class is an abstract of a callback class.

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