HDFS的Java客户端操作代码(查看HDFS下的文件是否存在)

1.查看HDFS目录下得文件是否存在

 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;

 public class CheckFileExist {
     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 delPath = new Path(uri);
             boolean isExists = fs.exists(delPath);
             System.out.println(isExists);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

 }

HDFS查看文件是否存在

2.打包jar运行并显示结果

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

3.验证结果

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