1.9、spring源碼，bean的生命週期，BeanPostProcessor處理的方法

接1.8、spring源碼，bean的生命週期

BeanPostProcessor類[interface]: bean的後置處理器

作用:在bean初始化前後進行一些處理工作

有兩個方法

1、postProcessBeforeInitialization():在初始化之前進行後置處理工作(在init-method之前),

什麼時候調用:它任何初始化方法調用之前(比如在InitializingBean的afterPropertiesSet初始化之前,或自定義init-method調用之前使用)       

public class Bike {

    public Bike(){
        System.out.println("構造--------bike");
    }
//postProcessBeforeInitialization在這裏之前調用
    public void init(){
        System.out.println("init-------bike");
    }
//postProcessAfterInitialization在init之後調用
    public void destory(){
        System.out.println("destory-------bike");
    }
}


@Configuration
public class DemoConfig {

    @Bean(initMethod = "init",destroyMethod = "destory")
    public Bike bike(){
        return new Bike();
    }
}

2、postProcessAfterInitialization():在初始化之後進行後置處理工作, 比如在InitializingBean的afterPropertiesSet()

實例配合上面的bean和config

@Component
public class HonryBeanPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("HonryBeanPostProcessor====postProcessBeforeInitialization");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("HonryBeanPostProcessor====postProcessAfterInitialization");
        return null;
    }
}

執行結果

構造--------bike
HonryBeanPostProcessor====postProcessBeforeInitialization
init-------bike
HonryBeanPostProcessor====postProcessAfterInitialization
IOC容器初始化完成