Spring执行流程和Bean的生命周期详解

public class BeanLife implements BeanNameAware, BeanFactoryAware, BeanPostProcessor {
    /*
        各种通知
     */
    @Override
    public void setBeanName(String s) {
        //s 是设置的Bean名称
        System.out.println("执行了通知：BeanNameAware - > BeanName = "+s);
    }
    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        System.out.println("执行了通知：BeanFactoryAware");
    }
    /*
        前置方法 ：默认情况不会显式调用
     */
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("执行了前置方法：postProcessBeforeInitialization");
        return bean;
    }
    /*
        初始化
     */
    public void myInit(){
        System.out.println("执行了xml方式的初始化 - > init-method");
    }
    @PostConstruct
    public void doPostConstruct(){
        System.out.println("执行了注解的初始化 - > PostConstruct");
    }
    /*
        后置方法 ：默认情况不会显式调用
     */
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("执行了后置方法：postProcessAfterInitialization");
        return bean;
    }
    //使用Bean
    public void sayHi(){
        System.out.println("使用Bean -> sayHi()");
    }
    /*
        销毁方法
     */
    @PreDestroy
    public void doPreDestroy(){
        System.out.println("执行了销毁方法：PreDestroy");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:content="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <bean id="beanLife" class="com.spring.demo.BeanLife" scope="prototype" init-method="myInit"></bean>
</beans>

public class App {
    public static void main(String[] args) {
        //此处使用ClassPathXmlApplicationContext，因为ApplicationContext没有销毁方法
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring.config.xml");
        BeanLife beanLife = context.getBean("beanLife",BeanLife.class);
       //使用bean
        beanLife.sayHi();
        //销毁容器(bean也就销毁了)
        context.destroy();
    }
}

@Controller
public class BController {
    @Autowired
    private User user1;//设置属性
    @PostConstruct//初始化
    public void say(){
        //再初始化中使用了user1里的属性
        System.out.println(user1.toString());
    }
}
vate User user1;//设置属性
    @PostConstruct//初始化
    public void say(){
        //再初始化中使用了user1里的属性
        System.out.println(user1.toString());
    }
}