Spring Bean生命周期

生命周期

这个总结的比较好！推荐一下。
官方链接

[1]___Person()
[2]___Person -- setName()
[3]______BeanNameAware接口中的setBeanName被调用 = person
[4]______ApplicationContextAware接口中的setApplicationContext被调用 = org.springframework.context.support.ClassPathXmlApplicationContext@35d176f7, started on Sun Nov 07 22:27:11 CST 2021
[5]______BeanPostProcessor接口中的postProcessBeforeInitialization被调用 = person
[6]______InitializingBean接口中的afterPropertiesSet被调用
[7]______Person--XML指定的--init-method被调用
[8]______BeanPostProcessor接口中的postProcessAfterInitialization被调用person
[9]______Person--run()
[10]______DisposableBean接口中的destroy()被调用
[11]______Person--XML指定的--destroy-method被调用

测试类

package com.lff;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
public class Person implements BeanNameAware, ApplicationContextAware , InitializingBean , DisposableBean {
    private String name;
    public Person() {
        System.out.println("[1]___Person()");
    }
    public void setName(String name) {
        this.name = name;
        System.out.println("[2]___Person -- setName()");
    }
    /**
     * s为在xml配置Bean的id
     * */
    @Override
    public void setBeanName(String s) {
        System.out.println("[3]______BeanNameAware接口中的setBeanName被调用 = " + s);
    }
    /**
     * 能够拿到容器对象，让我们知道我们是在哪个容器里面
     * */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("[4]______ApplicationContextAware接口中的setApplicationContext被调用 = " + applicationContext);
    }
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("[6]______InitializingBean接口中的afterPropertiesSet被调用" );
    }
    public void initMethod(){
        System.out.println("[7]______Person--XML指定的--init-method被调用");
    }
    public void run(){
        System.out.println("[9]______Person--run()");
    }
    @Override
    public void destroy() throws Exception {
        System.out.println("[10]______DisposableBean接口中的destroy()被调用" );
    }
    public void  destroyMethod(){
        System.out.println("[11]______Person--XML指定的--destroy-method被调用");
    }
}

package com.lff;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.lang.Nullable;
public class CommonBean implements BeanPostProcessor {
    @Nullable
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[5]______BeanPostProcessor接口中的postProcessBeforeInitialization被调用 = " + beanName);
        return bean;
    }
    @Nullable
    public  Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[8]______BeanPostProcessor接口中的postProcessAfterInitialization被调用" + beanName);
        return bean;
    }
}

XML配置

    <bean id="person" class="com.lff.Person"  init-method="initMethod" destroy-method="destroyMethod">
        <property name="name" value="lifufa" />
    </bean>
    <bean class="com.lff.CommonBean" />

详细解释

Bean完整的生命周期会经过很多方法的调用。划分为如下几类

• Bean自己的生命周期方法：构造方法、setter方法、通过配置文件指定的init-method、destroy-method的方法

• BeanNameAware的接口

    /**
     * s为在xml配置Bean的id
     * */
    @Override
    public void setBeanName(String s) {
        System.out.println("[3]______BeanNameAware接口中的setBeanName被调用 = " + s);
    }

• ApplicationContextAware的接口

  /**
     * 能够拿到容器对象，让我们知道我们是在哪个容器里面
     * */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("[4]______ApplicationContextAware接口中的setApplicationContext被调用 = " + applicationContext);
    }

• InitializingBean接口

   @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("[6]______InitializingBean接口中的afterPropertiesSet被调用" );
    }

• DisposableBean接口

    @Override
    public void destroy() throws Exception {
        System.out.println("[10]______DisposableBean接口中的destroy()被调用" );
    }

• BeanPostProcessor接口，可以做拦截器

    @Nullable
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[5]______BeanPostProcessor接口中的postProcessBeforeInitialization被调用 = " + beanName);
        return bean;
    }
    @Nullable
    public  Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[8]______BeanPostProcessor接口中的postProcessAfterInitialization被调用" + beanName);
        return bean;
    }