Java代码操作HDFS(在/user/root/下面創建目錄)

1.创建HDFS目录并打成jar包

 package Hdfs;

 import java.io.IOException;
 import java.net.URI;

 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 /**
  * 创建HDFS目录
  * @author SimonsZhao
  *
  */
 public class CreateDir {
     public static void main(String[] args) {
         String uri = "hdfs://neusoft-master:9000/user/root/test1";
         Configuration conf = new Configuration();
         try {
             FileSystem fs = FileSystem.get(URI.create(uri),conf);
             Path dfs = new Path("hdfs://neusoft-master:9000/user/root/test1");
             fs.mkdirs(dfs);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

JAVA代码创建HDFS目录

2.执行主文件

[root@neusoft-master hadoop]# hadoop jar /usr/local/software/JarCreateDir.jar

3.查看HDFS中是否存在创建的test1文件

[root@neusoft-master hadoop]# hadoop dfs -ls /user/root/