聊聊、Spring自动扫描

private static final PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
private static final SimpleMetadataReaderFactory register = new SimpleMetadataReaderFactory();

//指定包路径
Resource[] resources = resolver.getResources("classpath*:com/rockcode/**/*.class");
for (int i = 0; i < resources.length; i++) {
Resource resource = resources[i];
MetadataReader metadataReader = register.getMetadataReader(resource);

//读取资源的注解配置
AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();

//判断是否包含注解 例如：@A 注解
if (!annotationMetadata.hasAnnotation(A.class.getName())) continue;

//类信息 获取所有包含 @A 注解的类信息
ClassMetadata classMetadata = metadataReader.getClassMetadata(); 

//类全名
String className = classMetadata.getClassName();

//加载类
Class<?> clazz = Class.forName(className);

//如果是枚举，获取所有枚举值
Enum[] freezeBoxStates = (Enum[]) clazz.getEnumConstants();

}