/**

* 通過Hadoop api訪問

* @throws IOException

*/

@Test

public void readFileByAPI() throws IOException{

Configuration conf = new Configuration();

conf.set("fs.defaultFS", "hdfs://192.168.75.201:8020/");

FileSystem fs = FileSystem.get(conf);

Path path = new Path("/user/index.html");

FSDataInputStream fis =fs.open(path);

byte

int len = -1;

ByteArrayOutputStream baos = new ByteArrayOutputStream();

while((len = fis.read(bytes))!=-1){

baos.write(bytes, 0, len);

}

System.out.println(new String(baos.toByteArray()));

fis.close();

baos.close();

}

第二種方式：

/**

* 通過hadoop api訪問

* @throws IOException

*/

@Test

public void readFileByAPI2() throws

Configuration conf = new Configuration();

conf.set("fs.defaultFS", "hdfs://192.168.75.201:8020/");

FileSystem fs = FileSystem.get(conf);

Path path = new Path("/user/index.html");

FSDataInputStream fis =fs.open(path);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

IOUtils.copyBytes(fis, baos, 1024);

System.out.println(new String(baos.toByteArray()));

fis.close();

baos.close();

}

通過hadoopAPI訪問文件