SpringBoot 是怎么扫描到注解类的

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已于 2022-04-25 18:00:18 修改

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于 2022-02-09 21:23:30 首次发布

本文链接：https://blog.youkuaiyun.com/DBXXY/article/details/122847591

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本文深入探讨了SpringBoot如何通过ComponentScanAnnotationParser类扫描到@Component注解的类。重点解析了parse()方法，该方法创建了ClassPathBeanDefinitionScanner，并在doScan()方法中调用findCandidateComponents()来寻找候选组件。isCandidateComponent方法用于判断组件是否符合条件，同时涉及到了excludeFilters和includeFilters的过滤机制。

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ComponentScanAnnotationParser类 @Component注释的解析器

其中较为重要的是 parse() 方法

public Set<BeanDefinitionHolder> parse(AnnotationAttributes componentScan, final String declaringClass) {
   
		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(this.registry,
				componentScan.getBoolean("useDefaultFilters"), this.environment, this.resourceLoader);

		Class<? extends BeanNameGenerator> generatorClass = componentScan.getClass("nameGenerator");
		boolean useInheritedGenerator = (BeanNameGenerator.class == generatorClass);
		scanner.setBeanNameGenerator(useInheritedGenerator ? this.beanNameGenerator :
				BeanUtils.instantiateClass(generatorClass));

		ScopedProxyMode scopedProxyMode = componentScan.getEnum("scopedProxy");
		if (scopedProxyMode != ScopedProxyMode.DEFAULT) {
   
			scanner.setScopedProxyMode(scopedProxyMode);
		}
		else {
   
			Class<? extends ScopeMetadataResolver> resolverClass = componentScan.getClass("scopeResolver");
			scanner.setScopeMetadataResolver(BeanUtils.instantiateClass(resolverClass));
		}

		scanner.setResourcePattern(componentScan.getString("resourcePattern"));

		for (AnnotationAttributes filter : componentScan.getAnnotationArray("includeFilters")) {
   
			for (TypeFilter typeFilter : typeFiltersFor(filter)) {
   
				scanner.addIncludeFilter(typeFilter);
			}
		}
		for (AnnotationAttributes filter : componentScan.getAnnotationArray("excludeFilters")) {
   
			for

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