Custom BeanDefinitionRegistryPostProcessor

Overview

• BeanDefinitionRegistryPostProcessor inherits from BeanFactoryPostProcessor, which is a special BeanFactoryPostProcessor. The postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) method defined in BeanDefinitionRegistryPostProcessor allows us to implement custom registered bean definition logic.

use

public class CustomBeanDefinitionRegistry implements BeanDefinitionRegistryPostProcessor {

 @Override
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory ) throws BeansException {

 }

 @Override
 public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
 RootBeanDefinition helloBean = new RootBeanDefinition(Hello.class );
 //Add Bean Definition
 registry.registerBeanDefinition("hello", helloBean);
 }

}

// Method one, initialize via @Bean
@Configuration
public class SpringConfiguration {

 @Bean
 public CustomBeanDefinitionRegistry customBeanDefinitionRegistry() {
 return new CustomBeanDefinitionRegistry ();
 }
 
}

// Method two, initialize via @Component
@Component
public class CustomizeBeanDefinitionRegistryPostProce ssor implements BeanDefinitionRegistryPostProcessor {
 @Override
 public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
 //Print the current stack information
 Utils.printTrack(Definitionexecute postProcessBeanRegistry");

 //Create a bean definition class object, the bean type is CalculateServiceImpl
 RootBeanDefinition helloBean = new RootBeanDefinition(CalculateServiceImpl.class);

 //Bean definition registration To the spring environment
 beanDefinitionRegistry.registerBeanDefinition("calculateService", helloBean);
 }

 @Override
 public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
 //Print current stack information
 Utils.printTrack("execute postProcessBeanFactory");
 }
}

Reference

• Custom BeanDefinitionRegistryPostProcessor-Stone Perspective-CSDN Blog
• Spring4.1.8 Extension of Actual Combat Six: Registering Beans to Spring Content (BeanDefinitionRegistryPostProcessor Interface)-Programmer Xin Chen’s Blog-CSDN Blog