HDFS——如何获取文件的属性信息

可以用bin/hadoop fs -ls 来读取HDFS上的文件属性信息。

也可以采用HDFS的API来读取。如下：

import java.net.URI;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FileStatus;
public class FileInfo
{
 public static void main(String[] args) throws Exception
 {
  if(args.length != 1){
   System.out.println("Usage FileInfo <target>");
   System.exit(1);
  }
  Configuration conf = new Configuration();
  FileSystem hdfs = FileSystem.get(URI.create(args[0]),conf);
  FileStatus fs = hdfs.getFileStatus(new Path(args[0]));
  System.out.println("path: "+fs.getPath());
  System.out.println("length: "+fs.getLen());
  System.out.println("modify time: "+fs.getModificationTime());
  System.out.println("owner: "+fs.getOwner());
  System.out.println("replication: "+fs.getReplication());
  System.out.println("blockSize: "+fs.getBlockSize());
  System.out.println("group: "+fs.getGroup());
  System.out.println("permission: "+fs.getPermission().toString());
 }
}