spring[4]-BeanPostProcessor

package com.BeanFactoryPostProcessor;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;

/**
 * ===Spring IOC容器实例化Bean===
 * ===调用BeanPostProcessor的postProcessBeforeInitialization方法===
 * ===调用bean实例的初始化方法===
 * ===调用BeanPostProcessor的postProcessAfterInitialization方法===
 */
@Component
public class MyBeanPostProcessor implements BeanPostProcessor {

	/**
	 * bean初始化方法调用前被调用
	 */
	@Override
	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
		if(beanName.equals("userService")) {
			System.err.println(" BeanPostProcessor.postProcessBeforeInitialization beanName : " + beanName);
		}
		return bean;
	}

	/**
	 * bean初始化方法调用后被调用
	 */
	@Override
	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
		if(beanName.equals("userService")) {
			System.err.println(" BeanPostProcessor.postProcessAfterInitialization beanName : " + beanName);
		}
		return bean;
	}
}