通过实现BeanPostProcessor-后置处理器接口来实现bean在执行初始化方法前后的处理工作。

public class MyBeanPostProcessor implements BeanPostProcessor {

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("postProcessBeforeInitialization......"+ bean +"==>" + beanName);
        return bean;
    }

    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {

        System.out.println("postProcessAfterInitialization...... "+ bean +"==>" + beanName);
        return bean;
    }
}

postProcessBeforeInitialization......org.springframework.context.event.EventListenerMethodProcessor@6166e06f==>org.springframework.context.event.internalEventListenerProcessor
postProcessAfterInitialization...... org.springframework.context.event.EventListenerMethodProcessor@6166e06f==>org.springframework.context.event.internalEventListenerProcessor
postProcessBeforeInitialization......org.springframework.context.event.DefaultEventListenerFactory@1c72da34==>org.springframework.context.event.internalEventListenerFactory
postProcessAfterInitialization...... org.springframework.context.event.DefaultEventListenerFactory@1c72da34==>org.springframework.context.event.internalEventListenerFactory
postProcessBeforeInitialization......com.yyc.config.MainConfigOfLifeCycle$$EnhancerBySpringCGLIB$$3dbdcd18@6e38921c==>mainConfigOfLifeCycle
postProcessAfterInitialization...... com.yyc.config.MainConfigOfLifeCycle$$EnhancerBySpringCGLIB$$3dbdcd18@6e38921c==>mainConfigOfLifeCycle
car construct ....
postProcessBeforeInitialization......com.yyc.bean.Car@4450d156==>car
init method
postProcessAfterInitialization...... com.yyc.bean.Car@4450d156==>car
容器创建完成
五月 24, 2019 3:24:34 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext doClose
信息: Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@4141d797: startup date [Fri May 24 15:24:34 CST 2019]; root of context hierarchy
destroy method