package com.hadoop;import java.io.IOException;import java.io.InputStream;import java.net.URL;import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;import org.apache.hadoop.io.IOUtils;public class URLCat {	static {		URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());	}		public static void main(String[] args) throws Exception, IOException {				InputStream in = null;		try {			in = new URL(args[0]).openStream();			IOUtils.copyBytes(in, System.out, 4096,false);		} finally {			IOUtils.closeStream(in);		}	}}

　hadoop中运行：