一、ApplicationContextAwareProcessor

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

@Component
public class Dog implements ApplicationContextAware{

    private ApplicationContext applicationContext;

    public Dog(){
        System.out.println("dog constructor...");
    }

    //物件建立並賦值之後呼叫
    @PostConstruct
    public void init(){
        System.out.println("
 
[email protected]");
    }

    //容器移除物件之前
    @PreDestroy
    public void detory(){
        System.out.println("[email protected]");
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}
 

Dog類實現ApplicationContextAware介面，以此注入spring容器。靠的就是ApplicationContextAwareProcessor。

二、BeanValidationPostProcessor

三、InitDestroyAnnotationBeanPostProcessor

還記得我們的@PostConstruce和@PreDestory兩個註解嗎？它們是怎麼實現的?

四、AutowiredAnnotationBeanPostProcessor