@Component
public class HelloWorldService {
 @Value("${name:World}")
 private String name;
 public String getHelloMessage() {
 return "Hello " + this.name;
 }
}

@Configuration
public class BootStrap {
 @Bean
 public static HelloWorldService helloService() {
 return new HelloWorldService();
 }
 public static void main(String[] args) {
 InstantiationStrategy instantiationStrategy = new SimpleInstantiationStrategy();
 DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
 beanFactory.setInstantiationStrategy(instantiationStrategy);
 AnnotationConfigApplicationContext applicationContext = 
 new AnnotationConfigApplicationContext(beanFactory);
 applicationContext.register(BootStrap.class);
 applicationContext.refresh();
 HelloWorldService service = applicationContext.getBean(HelloWorldService.class);
 System.out.println(service.getHelloMessage());
 applicationContext.close();
 }
}

org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors() {
 ...
 //獲取適用的BeanDefinitionRegistryPostProcessor bean名稱
 String[] postProcessorNames =
  beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
 ...
 //根據(jù)beanName獲取PostProcessor， 處理@Configuration標(biāo)注類的beanName為
 //org.springframework.context.annotation.internalConfigurationAnnotationProcessor 
 //實現(xiàn)為org.springframework.context.annotation.ConfigurationClassPostProcessor
 ConfigurationClassPostProcessor postProcessor =beanFactory.getBean(postProcessorNames[0], BeanDefinitionRegistryPostProcessor.class)
}

org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(BeanDefinitionRegistry registry) {
 ConfigurationClassParser parser = new ConfigurationClassParser(
 this.metadataReaderFactory, this.problemReporter, this.environment,
 this.resourceLoader, this.componentScanBeanNameGenerator, registry);
 parser.parse(configCandidates);
 parser.validate();
 this.reader.loadBeanDefinitions(parser.getConfigurationClasses());
}

org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(BeanMethod beanMethod) {
 ConfigurationClassBeanDefinition beanDef = new ConfigurationClassBeanDefinition(configClass);
 beanDef.setBeanClassName(configClass.getMetadata().getClassName());
 beanDef.setFactoryMethodName(metadata.getMethodName());
 //registry 是DefaultListableBeanFactory的實例
 this.registry.registerBeanDefinition(beanName, beanDefToRegister);
}