1 public class TestRead {
 2     @Test
 3     public void readTest() throws Exception {
 4         Configuration conf = new Configuration();
 5         FileSystem fs = FileSystem.get(conf);
 6         FSDataInputStream fis = fs.open(new Path("hdfs://s201:8020/user/centos/hadoop/hello.txt"));
 7         IOUtils.copyBytes(fis, System.out, 1024);
 
 8         IOUtils.closeStream(fis);
 9 
10     }
11 
12     @Test
13     public void writeTest() throws Exception {
14         Configuration conf = new Configuration();
15         FileSystem fs = FileSystem.get(conf);
16         FSDataOutputStream fos = fs.create(new Path("hdfs://s201:8020/user/centos/hadoop/3.txt"),true
 
,1024,(short)2,512);
17         ByteArrayInputStream bis=new ByteArrayInputStream("who am i".getBytes());
18         IOUtils.copyBytes(bis,fos,1024);
19         IOUtils.closeStream(fos);
20 
21     }
22 }

使用idel和maven實現hadoop上數據的讀取和寫入