说明：  Hadoop HDFS文件系统操作例程。功能包括：获取HDFS指定目录下所有文件列表,打印输出 递归遍历目录 上传本地文件到HDFS 在HDFS上Hadoop HDFS文件系统例程。功能包括：创建文件夹 创建HDFS文件 读取HDFS文件内容 重命名HDFS文件 删除HDFS文件及目录 查看HDFS文件是否存在 获取HDFS中指定目录中的文件列表.
(Hadoop HDFS file system operations routine. Features include: HDFS to get a list of all files in the directory specified, print output recursive directory traversal upload local files to HDFS the Hadoop HDFS file system routines in HDFS. Features include: Create a folder create HDFS file reading HDFS file contents rename HDFS files delete HDFS files and directories see HDFS file exists access to HDFS in the list of files in the specified directory.)