读取hdfs文件系统中的文件

从hdfs中下载文件,下载的文件默认存储在E:盘下,如需修改下载路径,只需修改downloadPath,具体代码:

public static void readFromHdfs(String filename,String downloadPath) throws FileNotFoundException,IOException {
		  String dst = "hdfs://192.168.248.129:9000/"+filename;
		  Configuration conf = new Configuration();
		  FileSystem fs = FileSystem.get(URI.create(dst), conf);
		  FSDataInputStream hdfsInStream = fs.open(new Path(dst));
		  OutputStream out = new FileOutputStream(downloadPath);
		  byte[] ioBuffer = new byte[1024];
		  int readLen = hdfsInStream.read(ioBuffer);
		  while(-1 != readLen){
		  out.write(ioBuffer, 0, readLen);
		  readLen = hdfsInStream.read(ioBuffer);
		  }
		  out.close();
		  hdfsInStream.close();
		  fs.close();
		 }