spring awre的理解

Posted 2022-07-30 mingyuan1031

　　自定义组件想要使用Spring容器底层的一些组件（ApplicationContext，BeanFactory，xxx）；自定义组件实现xxxAware；在创建对象的时候，会调用接口规定的方法注入相关组件；Aware；把Spring底层一些组件注入到自定义的Bean中；xxxAware：功能使用xxxProcessor；ApplicationContextAware==》ApplicationContextAwareProcessor；

package com.aware.demo.bean;

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;

@Component
public class AwareDemo implements ApplicationContextAware, BeanNameAware , EmbeddedValueResolverAware 

    private ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException 

        System.out.println("这是传入的ioc容器："+applicationContext);
        this.applicationContext=applicationContext;
    

    @Override
    public void setBeanName(String s) 
        System.out.println("当前bean的名字:"+s);
    

    @Override
    public void setEmbeddedValueResolver(StringValueResolver stringValueResolver) 
        String s = stringValueResolver.resolveStringValue("你好$os.name,我是#20*18");
        System.out.println(s);
    

package com.aware.demo.bean;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class AppMain 


    public static void main(String[] args) 
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
        String[] bean = context.getBeanDefinitionNames();
        for (String b:bean)
        
            System.out.println(b);
        
    

运行结果：

当前bean的名字:awareDemo
10:53:03.196 [main] DEBUG org.springframework.core.env.PropertySourcesPropertyResolver - Found key ‘os.name‘ in PropertySource ‘systemProperties‘ with value of type String
你好Windows 10,我是360
这是传入的ioc容器：org.springframework.context.annotation.AnnotationConfigApplicationContext@544a2ea6, started on Sun Aug 18 10:53:02 CST 2019
org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
config
awareDemo