Java代码操作HDFS(在/user/root/下面創建目錄)

Posted 2020-08-27 Mr.Zhao

1.创建HDFS目录并打成jar包

 1 package Hdfs;
 2 
 3 import java.io.IOException;
 4 import java.net.URI;
 5 
 6 import org.apache.hadoop.conf.Configuration;
 7 import org.apache.hadoop.fs.FileSystem;
 8 import org.apache.hadoop.fs.Path;
 9 /**
10  * 创建HDFS目录
11  * @author SimonsZhao
12  *
13  */
14 public class CreateDir {
15     public static void main(String[] args) {
16         String uri = "hdfs://neusoft-master:9000/user/root/test1";
17         Configuration conf = new Configuration();
18         try {
19             FileSystem fs = FileSystem.get(URI.create(uri),conf);
20             Path dfs = new Path("hdfs://neusoft-master:9000/user/root/test1");
21             fs.mkdirs(dfs);
22         } catch (IOException e) {
23             e.printStackTrace();
24         }
25     }
26 }

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/