Spring源码情操陶冶-AnnotationConfigBeanDefinitionParser注解配置解析器

context:annotation-config

源码概览

BeanDefinitionParser

parse

@Override
public BeanDefinition parse(Element element, ParserContext parserContext) {
Object source = parserContext.extractSource(element);

// Obtain bean definitions for all relevant BeanPostProcessors.主要的作用就是配置BeanPostProcessors
Set<BeanDefinitionHolder> processorDefinitions =
AnnotationConfigUtils.registerAnnotationConfigProcessors(parserContext.getRegistry(), source);

// Register component for the surrounding <context:annotation-config> element.
CompositeComponentDefinition compDefinition = new CompositeComponentDefinition(element.getTagName(), source);
parserContext.pushContainingComponent(compDefinition);

// Nest the concrete beans in the surrounding component.
for (BeanDefinitionHolder processorDefinition : processorDefinitions) {
parserContext.registerComponent(new BeanComponentDefinition(processorDefinition));
}

// Finally register the composite component.
parserContext.popAndRegisterContainingComponent();

return null;
}

context:component-scan

context:annotation-config

ComponentScanBeanDefinitionParser#registerComponents

ComponentScanBeanDefinitionParser#registerComponents

小结

@Configuration

@Configuration

@Autowired/@Value

@Required

@Resource