Spring注解系列十四：生命周期-BeanPostProcessor

青旅半醒 2022-02-03 00:07 237阅读 0赞

1、MainConfigOfLifeCycle

/**
     * 4）、BeanPostProcessor【interface】：bean的后置处理器；
     * 		在bean初始化前后进行一些处理工作；
     * 		postProcessBeforeInitialization:在初始化之前工作
     * 		postProcessAfterInitialization:在初始化之后工作
     */
    @ComponentScan("com.atguigu.bean")
    @Configuration
    public class MainConfigOfLifeCycle {
    
    }

2、创建类MyBeanPostProcessor 。实现BeanPostProcessor 接口

/**
     * 后置处理器：初始化前后进行处理工作
     * 将后置处理器加入到容器中
     */
    @Component
    public class MyBeanPostProcessor implements BeanPostProcessor {
    
    	@Override
    	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
    		// TODO Auto-generated method stub
    		System.out.println("postProcessBeforeInitialization..."+beanName+"=>"+bean);
    		return bean;
    	}
    
    	@Override
    	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
    		// TODO Auto-generated method stub
    		System.out.println("postProcessAfterInitialization..."+beanName+"=>"+bean);
    		return bean;
    	}
    
    }

3、测试

@Test
    public void test01(){
    	//1、创建ioc容器
    	AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);
    	System.out.println("容器创建完成...");
    	
    	//关闭容器
    	applicationContext.close();
    }

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