做一个合格的程序猿之浅析Spring IoC源码（八）了解BeanFactoryAware

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这一节我们还是先了解一下BeanFactoryAware这个接口，之所以说只是了解一下，还是希望等到分析refresh()的时候有个更好的理解吧

照旧先上源代码：

官方解释：实现这个接口的bean其实是希望知道自己属于哪一个beanfactory

言简意赅，不需要做多解释，先实现一下自己，看看他的基本功能吧，看代码：

MyBeanFactoryAware.java

package org.study.spring.beanfactoryaware;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.BeanFactoryAware;public class MyBeanFactoryAware implements BeanFactoryAware{public void setBeanFactory(BeanFactory beanFactory) throws BeansException {System.out.println("I belong to ："+beanFactory);}}

bean-factory-aware.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jee="http://www.springframework.org/schema/jee"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsdhttp://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">                        <bean id="mybeanFactoryAware" class="org.study.spring.beanfactoryaware.MyBeanFactoryAware"></bean></beans>

MyBeanFactoryAwareTest.java

package org.study.spring.beanfactoryaware;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class MyBeanFactoryAwareTest{@Testpublic void test2() throws Exception{ ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean-factory-aware.xml"); MyBeanFactoryAware mybeanFactoryAware = applicationContext.getBean("mybeanFactoryAware",MyBeanFactoryAware.class); }}

运行结果：

的确，根据我们上次分析的源代码，的确属于DefaultListableBeanFactory

换个说法，我们目前不知道这个接口更多真实的意义，如果不分析其他的部分，我们就知道可以在实现BeanFactoryAware的bean中获取beanfactory,也就是获取上下文，其他的不知道暂时有什么用处，也许分析refresh就会有理解了吧~

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