/**

  *  功能：      将 hdfs://ssmaster:9000/data/paper.txt下载到Linux下/home/hadoop/paper.txt

  *  调用方式：hadoop jar 打包包名.jar

  */

 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;

 public class Test_Fun {

     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" );

     try {

       fs = FileSystem.get(conf) ;

       in = fs.open(src);

        } catch (IOException e) {

         e.printStackTrace();

     }

     try {

         out = new FileOutputStream ("/home/hadoop/paper.txt");

     } catch (FileNotFoundException e) {

         e.printStackTrace();

     }

     try {

         IOUtils.copy(in, out);

     } catch (IOException e) {

         e.printStackTrace();

     }

 }

 }