1 import java.net.URI;
2
3 import org.apache.hadoop.conf.Configuration;
4 import org.apache.hadoop.fs.FSDataInputStream;
5 import org.apache.hadoop.fs.FileSystem;
6 import org.apache.hadoop.fs.Path;
7
8
9 public class FileReadFromHdfs {
10
11 public static void main(String[] args) {
12 try {
13 String dsf = "hdfs://hadoop1:9000/tmp/wordcount/kkk.txt";
14 Configuration conf = new Configuration();
15
16 FileSystem fs = FileSystem.get(URI.create(dsf),conf);
17 FSDataInputStream hdfsInStream = fs.open(new Path(dsf));
18
19 byte[] ioBuffer = new byte[1024];
20 int readLen = hdfsInStream.read(ioBuffer);
21 while(readLen!=-1)
22 {
23 System.out.write(ioBuffer, 0, readLen);
24 readLen = hdfsInStream.read(ioBuffer);
25 }
26 hdfsInStream.close();
27 fs.close();
28 } catch (IOException e) {
29 // TODO Auto-generated catch block
30 e.printStackTrace();
31 }
32
33 }
34
35 }
