作为方法的附件，您可以按以下方式执行：

FileSystem fs = FileSystem.get(new URI(URI), super.getConf(), "hadoop");

检查dir是否为空。见api文件

RemoteIterator<LocatedFileStatus> files = fs.listFiles(<path-to-dir>, true)
// from iterator, determine if dir is empty

FileStatus[] files = fs.listStatus(<path-to-dir>)
// use array length to determine if dir is empty
// This also throws FileNotFoundException if file/dir does not exist, you can use it to determine if dir/file does not exist

检查文件是否为空。参见api文档this和this

long length = fs.getFileStatus(<file-path>).getLen()
// based on length determine if file is empty