IOC容器生命周期測驗

參考：https://www.cnblogs.com/zrtqsk/p/3735273.html

流程圖

這里的流程圖可以和最后的輸出結果對比，逐一對比來了解Spring Bean的生命周期，輸出結果已經經過很認真的整理，以及去除不必要的日志，并且對輸出結果做了優化，容易理解，

流程總結

Bean的完整生命周期經歷了各種方法呼叫，這些方法可以劃分為以下幾類：

Bean自身的方法: 這個包括了Bean本身呼叫的方法和通過組態檔中的init-method和destroy-method指定的方法
Bean級生命周期介面方法：這個包括了BeanNameAware、BeanFactoryAware、InitializingBean和DiposableBean這些介面的方法
容器級生命周期介面方法：這個包括了InstantiationAwareBeanPostProcessor 和 BeanPostProcessor 這兩個介面實作，一般稱它們的實作類為“后處理器”，
工廠后處理器介面方法：這個包括了AspectJWeavingEnabler, ConfigurationClassPostProcessor, CustomAutowireConfigurer等等非常有用的工廠后處理器介面的方法，工廠后處理器也是容器級的，在應用背景關系裝配組態檔之后立即呼叫，

測驗Spring Bean生命周期

Demo 類

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

public class Demo implements BeanFactoryAware, ApplicationContextAware,
        BeanNameAware, InitializingBean, DisposableBean {

    private BeanFactory beanFactory;
    private String beanName;
    private ApplicationContext ioc;
    private int name;

    public Demo() {
        System.out.println("呼叫Demo構造方法...");
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        System.out.println("[BeanFactoryAware]... setBeanFactory : " + beanName);
        this.beanFactory = beanFactory;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("[ApplicationContextAware]... setIOC : " + applicationContext);
        this.ioc = applicationContext;
    }

    @Override
    public void setBeanName(String s) {
        System.out.println("[BeanNameAware]... setBeanName : " + s);
        this.beanName = s;
    }

    @Override
    public void destroy() throws Exception {
        System.out.println("[DisposableBean]... ");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("[InitializingBean]... afterPropertiesSet()");
    }

    public void myInit() {
        System.out.println("[init-method]...");
    }

    public void myDestroy() {
        System.out.println("[destroy-method]...");
    }

    @Override
    public String toString() {
        return "Demo{" +
                "beanFactory=" + beanFactory +
                ", beanName='" + beanName + '\'' +
                ", ioc=" + ioc +
                ", name=" + name +
                '}';
    }

    public BeanFactory getBeanFactory() {
        return beanFactory;
    }

    public String getBeanName() {
        return beanName;
    }

    public ApplicationContext getIoc() {
        return ioc;
    }

    public void setIoc(ApplicationContext ioc) {
        this.ioc = ioc;
    }

    public int getName() {
        return name;
    }

    public void setName(int name) {
        System.out.println("注入name屬性...");
        this.name = name;
    }
}

MyBeanFactoryPostProcessor：

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
    public MyBeanFactoryPostProcessor() {
        super();
        System.out.println("BeanFactoryPostProcessor的實作類構造器");
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
        System.out.println("BeanFactoryPostProcessor呼叫postProcessorBeanFactory方法");
        BeanDefinition bd = configurableListableBeanFactory.getBeanDefinition("demo");
        bd.getPropertyValues().addPropertyValue("name", "100");
    }
}

MyBeanPostProcessor:

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyBeanPostProcessor implements BeanPostProcessor {
    public MyBeanPostProcessor() {
        System.out.println("MyBeanPostProcessor的建構式");
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[postProcessor]... postProcessAfterInitialization");
        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("[postProcessor]... postProcessBeforeInitialization");
        return bean;
    }
}

MyInstantiationAwareBeanPostProcessor:

import org.springframework.beans.BeansException;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;
import java.beans.PropertyDescriptor;

public class MyInstantiationAwareBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter {

    public MyInstantiationAwareBeanPostProcessor() {
        super();
        System.out.println("MyInstantiationAwareBeanPostProcessor... 的建構式");
    }

    /**
     * 實體化bean前呼叫
     * @param bean
     * @param beanName
     * @return
     * @throws BeansException
     */
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("InstantiationAwareBeanPostProcessor呼叫postProcessBeforeInstantiation方法");
        return super.postProcessBeforeInitialization(bean, beanName);
    }

    /**
     * 實體化bean之后呼叫
     * @param bean
     * @param beanName
     * @return
     * @throws BeansException
     */
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("InstantiationAwareBeanPostProcessor呼叫postProcessAfterInstantiation方法");
        return super.postProcessAfterInitialization(bean, beanName);
    }

    /**
     * 設定某個屬性時呼叫
     * @param pvs
     * @param pds
     * @param bean
     * @param beanName
     * @return
     * @throws BeansException
     */
    @Override
    public PropertyValues postProcessPropertyValues(PropertyValues pvs, PropertyDescriptor[] pds, Object bean, String beanName) throws BeansException {
        System.out.println("InstantiationAwareBeanPostProcessor呼叫postProcessPropertyValues方法");
        return super.postProcessPropertyValues(pvs, pds, bean, beanName);
    }
}

application.xml：

<?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:p="http://www.springframework.org/schema/p"
       xmlns:context="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 http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.xxx.springboot.springBeanTest"/>

    <bean id="beanPostProcessor" class="com.xxx.springboot.springBeanTest.MyBeanPostProcessor"/>

    <bean id="instantiationAwareBeanPostProcessor" class="com.xxx.springboot.springBeanTest.MyInstantiationAwareBeanPostProcessor"/>

    <bean id="beanFactoryPostProcessor" class="com.xxx.springboot.springBeanTest.MyBeanFactoryPostProcessor"/>

    <bean id="demo" class="com.xxx.springboot.springBeanTest.Demo"
          scope="singleton" p:name="200"
          init-method="myInit" destroy-method="myDestroy" />
</beans>

Main函式：

    public static void main(String[] args) {
        System.out.println("IOC starting...");
        ClassPathXmlApplicationContext ioc =
                new ClassPathXmlApplicationContext("app.xml");
        System.out.println("IOC started...");
        Demo demo = ioc.getBean("demo", Demo.class);
        System.out.println(demo);
        System.out.println("IOC closing...");
        ioc.close();
        System.out.println("IOC closed...");
    }

輸出結果：

******************** IOC starting... ********************
18:51:50.401 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2ac1fdc4

18:51:50.649 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 9 bean definitions from class path resource [app.xml]

18:51:50.676 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'

18:51:50.699 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'

18:51:50.701 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'beanFactoryPostProcessor'

BeanFactoryPostProcessor的實作類構造器

18:51:50.702 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'

BeanFactoryPostProcessor呼叫postProcessorBeanFactory方法

18:51:50.704 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
18:51:50.706 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
18:51:50.712 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'beanPostProcessor'

MyBeanPostProcessor的建構式

18:51:50.729 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'instantiationAwareBeanPostProcessor'

MyInstantiationAwareBeanPostProcessor... 的建構式

18:51:50.738 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'demo'

呼叫Demo構造方法...

InstantiationAwareBeanPostProcessor呼叫postProcessPropertyValues方法

注入name屬性...

[BeanNameAware]... setBeanName : demo

[BeanFactoryAware]... setBeanFactory : demo

[ApplicationContextAware]... setIOC : org.springframework.context.support.ClassPathXmlApplicationContext@2ac1fdc4, started on Wed Dec 30 18:51:50 CST 2020

[postProcessor]... postProcessBeforeInitialization

InstantiationAwareBeanPostProcessor呼叫postProcessBeforeInstantiation方法

[InitializingBean]... afterPropertiesSet()

[init-method]...

[postProcessor]... postProcessAfterInitialization

InstantiationAwareBeanPostProcessor呼叫postProcessAfterInstantiation方法

******************** IOC started... ********************

Demo{beanFactory=org.springframework.beans.factory.support.DefaultListableBeanFactory@704d6e83: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,beanPostProcessor,instantiationAwareBeanPostProcessor,beanFactoryPostProcessor,demo]; root of factory hierarchy, beanName='demo', ioc=org.springframework.context.support.ClassPathXmlApplicationContext@2ac1fdc4, started on Wed Dec 30 18:51:50 CST 2020, name=100}

******************** IOC closing... ********************

18:51:50.815 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Closing org.springframework.context.support.ClassPathXmlApplicationContext@2ac1fdc4, started on Wed Dec 30 18:51:50 CST 2020

[DisposableBean]... 

[destroy-method]...

******************** IOC closed... ********************

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Spring Bean完整生命周期測驗，超詳細輸出結果展示