package com.company;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;

import org.apache.hadoop.io.IOUtils;

public class Main {

    static {

        URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());

    }

    public static void main(String[] args) throws MalformedURLException,IOException {

        InputStream in=null;

        try{

            in = new URL(args[0]).openStream();

            IOUtils.copyBytes(in,System.out,4096,false);

        }finally {

            IOUtils.closeStream(in);

        }

    }

}

import java.io.IOException;

import java.io.InputStream;

import java.net.URI;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.FileSystem;

import org.apache.hadoop.fs.Path;

import org.apache.hadoop.io.IOUtils;

public class hdfsclient {

    public static void main(String[] args) throws IOException{

        String uri="hdfs://localhost:9000/test/hello";

        Configuration conf=new Configuration();

        FileSystem fs = FileSystem.get(URI.create(uri),conf);

        InputStream in=null;

        try{

            in = fs.open(new Path(uri));

            IOUtils.copyBytes(in,System.out,4096,false);

        }finally {

            IOUtils.closeStream(in);

        }

    }

}