23、自动装配-Aware注入Spring底层组件&原理

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：