package hadoop.hdfs;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import org.apache.commons.compress.utils.IOUtils;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.FSDataInputStream;

import org.apache.hadoop.fs.FileSystem;

import org.apache.hadoop.fs.Path;

/**

 *  功能：      将 hdfs://ssmaster:9000/data/paper.txt下载到Windows下c:\paper.txt

 *  调用方式：hadoop jar 打包包名.jar

 */

public class Hdfs_Download {

    public static void main(String[] args) {

    Configuration conf =new Configuration();

    FileSystem fs = null;

    Path src = null;

    FSDataInputStream in = null;

    FileOutputStream out = null;

//    src = new Path("hdfs://ssmaster:9000/data/paper.txt" );

    src = new Path("hdfs://ssmaster:9000/data/paper.txt" );

    try {

      fs = FileSystem.get(conf) ;

      in = fs.open(src);

       } catch (IOException e) {

        e.printStackTrace();

    }

    try {

        out = new FileOutputStream ("c:\\paper.txt");

    } catch (FileNotFoundException e) {

        e.printStackTrace();

    }

    try {

        IOUtils.copy(in, out);

    } catch (IOException e) {

        e.printStackTrace();

    }

}

}