1 /**
 2  *  功能：      将 hdfs://ssmaster:9000/data/paper.txt下载到Linux下/home/hadoop/paper.txt
 3  *  调用方式：hadoop jar 打包包名.jar  
 4  */
 5 package hadoop.hdfs;
 6 
 7 import java.io.FileNotFoundException;
 8 import java.io.FileOutputStream;
 9 import java.io.IOException;
10 
11 import org.apache.commons.compress.utils.IOUtils;
12 import org.apache.hadoop.conf.Configuration;
13 import org.apache.hadoop.fs.FSDataInputStream;
14 import org.apache.hadoop.fs.FileSystem;
15 import org.apache.hadoop.fs.Path;
16 
17 public class Test_Fun {
18 
19     public static void main(String[] args) {
20         
21     Configuration conf =new Configuration();
22     
23     FileSystem fs = null;
24     Path src = null;
25     FSDataInputStream in = null;
26     FileOutputStream out = null;
27       
28     src = new Path("hdfs://ssmaster:9000/data/paper.txt" );
29     
30     try {
31         
32       fs = FileSystem.get(conf) ;
33       in = fs.open(src);
34 
35        } catch (IOException e) {
36         e.printStackTrace(); 
37     }
38     
39     try {
40         out = new FileOutputStream ("/home/hadoop/paper.txt");
41     } catch (FileNotFoundException e) {
42         e.printStackTrace();
43     }
44     
45     try {
46         IOUtils.copy(in, out);
47     } catch (IOException e) {
48         e.printStackTrace();
49     }
50 
51 }
52 }