答案就在下面揭晓
// `org.springframework.context.annotation.ConfigurationClassParser protected final SourceClass doProcessConfigurationClass( ConfigurationClass configClass, SourceClass sourceClass, Predicate<String> filter) throws IOException { // 如果有Component注解 if (configClass.getMetadata().isAnnotated(Component.class.getName())) { // 首先递归处理内部类 processMemberClasses(configClass, sourceClass, filter); } // 处理所有的@PropertySource注解 for (AnnotationAttributes propertySource : AnnotationConfigUtils.attributesForRepeatable( sourceClass.getMetadata(), PropertySources.class, org.springframework.context.annotation.PropertySource.class)) { if (this.environment instanceof ConfigurableEnvironment) { processPropertySource(propertySource); } else { logger.info("Ignoring @PropertySource annotation on [" + sourceClass.getMetadata().getClassName() + "]. Reason: Environment must implement ConfigurableEnvironment"); } } // 处理所有的 @ComponentScan 和@ComponentScans Set<AnnotationAttributes> componentScans = AnnotationConfigUtils.attributesForRepeatable( sourceClass.getMetadata(), ComponentScans.class, ComponentScan.class); if (!componentScans.isEmpty() && !this.conditionEvaluator.shouldSkip(sourceClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN)) { for (AnnotationAttributes componentScan : componentScans) { // The config class is annotated with @ComponentScan -> perform the scan immediately Set<BeanDefinitionHolder> scannedBeanDefinitions = this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName()); // 继续检查扫描的BeanDefinition有没有是配置类的 for (BeanDefinitionHolder holder : scannedBeanDefinitions) { BeanDefinition bdCand = holder.getBeanDefinition().getOriginatingBeanDefinition(); if (bdCand == null) { bdCand = holder.getBeanDefinition(); } if (ConfigurationClassUtils.checkConfigurationClassCandidate(bdCand, this.metadataReaderFactory)) { // 如果是的话，解析 parse(bdCand.getBeanClassName(), holder.getBeanName()); } } } } // 处理所有的@Import注解，将导入的Bean注册到BeanDefinitionRegistry // 这个也是会查找注解的注解，制止找到所有的@Import processImports(configClass, sourceClass, getImports(sourceClass), filter, true); // 处理所有的@ImportResource 注解，将导入的Bean注册到BeanDefinitionRegistry AnnotationAttributes importResource = AnnotationConfigUtils.attributesFor(sourceClass.getMetadata(), ImportResource.class); if (importResource != null) { String[] resources = importResource.getStringArray("locations"); Class<? extends BeanDefinitionReader> readerClass = importResource.getClass("reader"); for (String resource : resources) { String resolvedResource = this.environment.resolveRequiredPlaceholders(resource); configClass.addImportedResource(resolvedResource, readerClass); } } // 处理独立的 @Bean方法，生成BeanMethod // 使用@Bean，方法要是可重写，也就是不能为default/private，因为要使用CGLIB代理 // 详细可进去下面方法细看 Set<MethodMetadata> beanMethods = retrieveBeanMethodMetadata(sourceClass); for (MethodMetadata methodMetadata : beanMethods) { configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass)); } // 处理接口的默认方法 processInterfaces(configClass, sourceClass); // 如果有父类，处理 if (sourceClass.getMetadata().hasSuperClass()) { String superclass = sourceClass.getMetadata().getSuperClassName(); if (superclass != null && !superclass.startsWith("java") && !this.knownSuperclasses.containsKey(superclass)) { this.knownSuperclasses.put(superclass, configClass); // Superclass found, return its annotation metadata and recurse return sourceClass.getSuperClass(); } } //没有父类，处理完成 return null; }