Hadoop分布式文件系统HDFS访问例程，为Java界面程序，通过IOUtils.copyBytes可将 本地上传文件到HDFS；或从HDFS下载文件到本地硬盘。开发环境为Eclipse。-Hadoop Distributed File System HDFS access routines for Java interface program, through IOUtils.copyBytes can upload files to the local HDFS or downloa