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();
        }
    }

}

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/