自定义基于Spring的自动扫描器

主要代码结构如下：

//Ant模式通配符的Resource查找器
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();

//缓存MetadataReader工厂类
MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resourcePatternResolver);

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

public void loadClass(){
	try{
		//增加过滤条件，提取出有Component注解类的资源
		this.includeFilters.add(new AnnotationTypeFilter(Component.class, true, true));
		
		String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + "com/cjm" + "/**/*.class";
		//查找到一批资源
		Resource[] resources = resourcePatternResolver.getResources(pattern);  
		for(Resource resource : resources){
			if(resource.isReadable()){
				//获取资源的元数据读取器
				MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
				
				//对资源进行过滤处理
				if(isCandidateComponent(metadataReader)){
					//从元数据中取得类名
					String className = metadataReader.getAnnotationMetadata().getClassName();
					//根据类名记载类
					Class<?> clazz = ClassUtils.forName(className, Test.class.getClassLoader());
					System.out.println(clazz.getName());
				}
			} 
		}
	}catch(Exception ex){
		ex.printStackTrace();
	}
}

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