Springboot之类路径扫描

SpringBoot框架中默认提供的扫描类为：ClassPathBeanDefinitionScanner。 webFlux框架中借助RepositoryComponentProvider扫描符合条件的Repository。

public class ClassPathScanningCandidateComponentProvider{

	private final List<TypeFilter> includeFilters = new ArrayList<>();
	private final List<TypeFilter> excludeFilters = new ArrayList<>();

	public Set<BeanDefinition> findCandidateComponents(String basePackage) {
		//根据类路径扫描候选类
		return scanCandidateComponents(basePackage);
	}

	private Set<BeanDefinition> scanCandidateComponents(String basePackage) {
		Set<BeanDefinition> candidates = new LinkedHashSet<>();
		try {
			String packageSearchPath = "classpath*:" + resolveBasePackage(basePackage) + '/' + this.resourcePattern;
			Resource[] resources = getResourcePatternResolver().getResources(packageSearchPath);
			for (Resource resource : resources) {
				String filename = resource.getFilename();
				MetadataReader metadataReader = getMetadataReaderFactory().getMetadataReader(resource);
				if (isCandidateComponent(metadataReader)) {
					ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
					sbd.setSource(resource);
					if (isCandidateComponent(sbd)) {//候选类条件判断
						candidates.add(sbd);
					}
				}
			}
		}
		return candidates;
	}

	protected boolean isCandidateComponent(MetadataReader metadataReader) throws IOException {
		for (TypeFilter tf : this.excludeFilters) {
			if (tf.match(metadataReader, getMetadataReaderFactory())) {
				return false;
			}
		}
		for (TypeFilter tf : this.includeFilters) {
			if (tf.match(metadataReader, getMetadataReaderFactory())) {
				return isConditionMatch(metadataReader);
			}
		}
		return false;
	}
}

扫描路径提供：includeFilters & excludeFilters。