Spring Post Processor - BeanFactoryPostProcessor and BeanDefinitionRegistryPostProcessor

Spring Post Processor Beanfactorypostprocessor

BeanPostProcessor : bønnepostprosessor, objektet for oppretting av bønner blir snappet opp før og etter initialisering

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Hva er BeanFactoryPostProcessor? :Postprosessoren til beanFactory
* Kalt etter initialisering av BeanFactory for å tilpasse og modifisere innholdet i BeanFactory
*Alle bønnedefinisjoner er lagret og lastet inn i beanFactory, men bønneinstansen er ennå ikke opprettet.
*
BeanFactoryPostProcessor-prinsipp:
* 1), ioc container creation object
* 2) 、 påkalleBeanFactoryPostProcessors (beanFactory)
* Hvordan finne alle BeanFactoryPostProcessors og utføre metodene deres
* 1) Finn alle komponentene i BeanFactoryPostProcessor direkte i BeanFactory og utfør metodene deres
* 2), utfør før du initialiserer andre komponenter

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Hva er BeanDefinitionRegistryPostProcessor:
BeanDefinitionRegistryPostProcessor utvider BeanFactoryPostProcessor
* postProcessBeanDefinitionRegistry ()
* Laster inn når all bønnedefinisjonsinformasjon er i ferd med å lastes inn og bønneinstansen ikke er opprettet ennå
*
*Utført fremfor BeanFactoryPostProcessor
*Bruk BeanDefinitionRegistryPostProcessor for å legge til flere komponenter i beholderen
*
BeanDefinitionRegistryPostProcessor prinsipp:
* 1), ioc skape objekt
* 2） 、 oppdater () -》 påkalleBeanFactoryPostProcessors (beanFactory)
* 3) Få alle BeanDefinitionRegistryPostProcessor-komponentene fra beholderen.
* 1. Utløs alle postProcessBeanDefinitionRegistry () -metoder i sin tur
* 2, og utløs deretter metoden postProcessBeanFactory () BeanFactoryPostProcessor
*
* 4), finn deretter BeanFactoryPostProcessor-komponenten fra beholderen, og utløs deretter postProcessBeanFactory () -metoden i sin tur

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Merk rekkefølgen for utførelse: BeanDefinitionRegistryPostProcessor har forrang over BeanFactoryPostProcessor, og BeanFactoryPostProcessor har forrang over beaninstansiering

test:

1, opprett en ny MyBeanDefinitionRegistryPostProcessor .java-klasse

 package com.atguigu.ext 
 import org.springframework.beans.BeansException 
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory 
 import org.springframework.beans.factory.support.AbstractBeanDefinition 
 import org.springframework.beans.factory.support.BeanDefinitionBuilder 
 import org.springframework.beans.factory.support.BeanDefinitionRegistry 
 import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor 
 import org.springframework.beans.factory.support.RootBeanDefinition 
 import org.springframework.stereotype.Component 
 import com.atguigu.bean.Blue 
 @Component 
 public class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor{ 
 @Override 
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { 
 // TODO Auto-generated method stub 
 System.out.println('Number of MyBeanDefinitionRegistryPostProcessor...beans:'+beanFactory.getBeanDefinitionCount()) 
 } 
 //BeanDefinitionRegistry Bean defines the save center of the information. Later, the BeanFactory creates a bean instance according to each bean definition information saved in the BeanDefinitionRegistry. 
 @Override 
 public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException { 
 // TODO Auto-generated method stub 
 System.out.println('Number of postProcessBeanDefinitionRegistry...beans:'+registry.getBeanDefinitionCount()) 
 //RootBeanDefinition beanDefinition = new RootBeanDefinition(Blue.class) 
 AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.rootBeanDefinition(Blue.class).getBeanDefinition() 
 registry.registerBeanDefinition('hello', beanDefinition) 
 } 
 } 
 

2, den nye MyBeanFactoryPostProcessor.java-klassen

 package com.atguigu.ext 
 import java.util.Arrays 
 import org.springframework.beans.BeansException 
 import org.springframework.beans.factory.config.BeanFactoryPostProcessor 
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory 
 import org.springframework.stereotype.Component 
 @Component 
 public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor { 
 @Override 
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { 
 System.out.println('MyBeanFactoryPostProcessor...postProcessBeanFactory...') 
 int count = beanFactory.getBeanDefinitionCount() 
 String[] names = beanFactory.getBeanDefinitionNames() 
 System.out.println('There is a current BeanFactory'+count+' Beans') 
 System.out.println(Arrays.asList(names)) 
 } 
 } 
 

3, ny konfigurasjonsklasse

 @ComponentScan('com.atguigu.ext') 
 @Configuration 
 public class ExtConfig { 
 @Bean 
 public Blue blue(){ 
 return new Blue() 
 } 
 } 
 

4, test

 package com.atguigu.test 
 import org.junit.Test 
 import org.springframework.context.ApplicationEvent 
 import org.springframework.context.annotation.AnnotationConfigApplicationContext 
 import com.atguigu.ext.ExtConfig 
 public class IOCTest_Ext { 
 @Test 
 public void test01(){ 
 AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(ExtConfig.class) 
 applicationContext.close() 
 } 
 } 
 

Testresultater:

Beskrivelse: I henhold til utførelsesordren 1, 2, 3, forklar BeanDefinitionRegistryPostProcessor har forrang over BeanFactoryPostProcessor, og BeanFactoryPostProcessor har forrang over beaninstansiering