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：
