如何自动装配-Aware注入Spring底层组件及原理
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23、自动装配-Aware注入Spring底层组件&原理
Aware 接口,提供了类似回调函数的功能
自定义组件想要使用Spring 容器底层的一些组件(Application Context,Bean Factory);自定义组件需要实现xxxAware接口;在创建对象的时候,会调用接口规定的方法注入相关组件
package org.springframework.beans.factory; public interface Aware { }
23.1 ApplicationContextAware 自动注入IOC容器
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 注入事件派发器
package org.springframework.context; import org.springframework.beans.factory.Aware; public interface ApplicationEventPublisherAware extends Aware { void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher); }
23.3 BeanClassLoaderAware 类加载器
package org.springframework.beans.factory; public interface BeanClassLoaderAware extends Aware { void setBeanClassLoader(ClassLoader classLoader); }
23.4 BeanFactoryAware Bean工厂
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名字
package org.springframework.beans.factory; public interface BeanNameAware extends Aware { void setBeanName(String name); }
23.6 EmbeddedValueResolverAware Embedded值解析器
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 环境
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 导入相关的
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 导入相关的
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 国际化
package org.springframework.context; import org.springframework.beans.factory.Aware; public interface MessageSourceAware extends Aware { void setMessageSource(MessageSource messageSource); }
23.11 NotificationPublisherAware 发送通知的支持
package org.springframework.jmx.export.notification; import org.springframework.beans.factory.Aware; public interface NotificationPublisherAware extends Aware { void setNotificationPublisher(NotificationPublisher notificationPublisher); }
23.12 ResourceLoaderAware 资源加载器
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 测试用例
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 2018/11/28 15:44 * @Version 1.0 */ @Component public class Red implements ApplicationContextAware, BeanNameAware, EmbeddedValueResolverAware { private ApplicationContext applicationContext; public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { System.out.println("传入的IOC " + applicationContext); this.applicationContext = applicationContext; } public void setBeanName(String name) { System.out.println("当前bean的名字" + name); } public void setEmbeddedValueResolver(StringValueResolver resolver) { String value = resolver.resolveStringValue("你好${os.name} 我是#{20*20}"); System.out.println("解析的字符串:" + value); } }
运行:
说白了 Aware接口类,就是一个回调类的抽象
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