1.编辑一个文件并通过hadoop命令将其放到HDFS中

　　

　

2.使用java代码访问所上传的文件

private final static String PATH = "hdfs://hadoop:9000/hello";		public static void main(String[] args) throws Exception 	{		URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());		URL url = new URL(PATH);		InputStream in = url.openStream();		IOUtils.copyBytes(in, System.out, 1024, true);	}