如何从类路径中的Java包中读取所有类？

如果你的类路径中包含Spring，则可以执行以下操作。

在包中找到所有用XmlRootElement注释的类：

private List<Class> findMyTypes(String basePackage) throws IOException, ClassNotFoundException{    ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();    metadataReaderFactory metadataReaderFactory = new CachingmetadataReaderFactory(resourcePatternResolver);    List<Class> candidates = new ArrayList<Class>();    String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +         resolvebasePackage(basePackage) + "/" + "**/*.class";    Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);    for (Resource resource : resources) {        if (resource.isReadable()) { metadataReader metadataReader = metadataReaderFactory.getmetadataReader(resource); if (isCandidate(metadataReader)) {     candidates.add(Class.forName(metadataReader.getClassmetadata().getClassName())); }        }    }    return candidates;}private String resolvebasePackage(String basePackage) {    return ClassUtils.convertClassNameToResourcePath(SystemPropertyUtils.resolvePlaceholders(basePackage));}private boolean isCandidate(metadataReader metadataReader) throws ClassNotFoundException{    try {        Class c = Class.forName(metadataReader.getClassmetadata().getClassName());        if (c.getAnnotation(XmlRootElement.class) != null) { return true;        }    }    catch(Throwable e){    }    return false;}