小编给大家分享一下ASP.NET实现Hadoop增删改查的方法，希望大家阅读完这篇文章后大所收获，下面让我们一起去探讨吧！

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具体如下：

packages.config

HDFSAccess.cs

using Microsoft.Hadoop.WebHDFS;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;

namespace Physical
{
  public sealed class HDFSAccess
  {
    private readonly WebHDFSClient webHDFSClient;

    public HDFSAccess(string uriString, string userName)
    {
      this.webHDFSClient = new WebHDFSClient(new Uri(uriString), userName);
    }

    public List GetDirectories(string path)
    {
      var directoryStatus = this.webHDFSClient.GetDirectoryStatus(path).Result;

      return directoryStatus.Directories.Select(d => d.PathSuffix).ToList();
    }

    public List GetFiles(string path)
    {
      var directoryStatus = this.webHDFSClient.GetDirectoryStatus(path).Result;

      return directoryStatus.Files.Select(d => d.PathSuffix).ToList();
    }

    public bool CreateDirectory(string path)
    {
      // 传入路径不包含根目录时，预设会在根目录「/」底下
      return this.webHDFSClient.CreateDirectory(path).Result;
    }

    public bool DeleteDirectory(string path)
    {
      // 传入路径不包含根目录时，预设会在根目录「/」底下
      return this.webHDFSClient.DeleteDirectory(path).Result;
    }

    public string CreateFile(string localFile, string remotePath)
    {
      // 传入远端路径不包含根目录时，预设会在根目录「/」底下
      return this.webHDFSClient.CreateFile(localFile, remotePath).Result;
    }

    public bool DeleteFile(string path)
    {
      // 传入路径不包含根目录时，预设会在根目录「/」底下
      return this.webHDFSClient.DeleteDirectory(path).Result;
    }

    public HttpResponseMessage OpenFile(string path)
    {
      // 传入路径不包含根目录时，预设会在根目录「/」底下
      return this.webHDFSClient.OpenFile(path).Result;
    }
  }
}

Program.cs

using Physical;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyTest
{
  class Program
  {
    // HDFS cluster 客户端进入端点设定于 主机上
    // 预设端点：http://[主机名称]:50070
    // 预设帐号：Wu
    private static HDFSAccess access = new HDFSAccess(@"http://127.0.0.1:50070", "Wu");

    static void Main(string[] args)
    {
      GetDirectoriesTest();
      Console.WriteLine("----------------------------------------------");
      GetFilesTest();
      Console.WriteLine("----------------------------------------------");
      DirectoryTest();
      Console.WriteLine("----------------------------------------------");
      FileTest();
      Console.WriteLine("----------------------------------------------");
      OpenFileTest();
      Console.ReadKey();
    } 

    public void TestCleanup()
    {
      //取得根目录资料夹
      var directories = access.GetDirectories(@"/");

      // 移除预设目录：tmp、user 外的目录
      foreach (var directory in directories)
      {
        if ("tmp".Equals(directory) || "user".Equals(directory))
        {
          continue;
        }
        else
        {
          access.DeleteDirectory(directory);
        }
      }

      // 取得根目录档案
      var files = access.GetFiles(@"/");

      // 移除所有档案
      foreach (var file in files)
      {
        access.DeleteFile(file);
      }

      // 移除 OpenFile 转存档案
      File.Delete(Path.Combine(Directory.GetCurrentDirectory(), "Test.jpg"));
    }

    //_传入根目录_预期回传预设目录
    public static void GetDirectoriesTest()
    {
      // 预设根目录下有两个目录：tmp、user
      var expected = new List() { "tmp", "user", };

      var actual = access.GetDirectories(@"/");

      foreach (var item in actual)
      {
        Console.WriteLine(item);
      }

    }

    //_传入根目录_预期回传空集合
    public static void GetFilesTest()
    {
      // 预设根目录下没有档案
      var expected = new List();

      var actual = access.GetFiles(@"/");
      foreach (var item in actual)
      {
        Console.WriteLine(item);
      }

    }

    //_建立zzz目录_预期成功_预期根目录下有zzz目录_删除zzz目录_预期成功_预期根目录下无zzz目录
    public static void DirectoryTest()
    {
      var directoryName = "zzz";

      // 建立zzz目录
      var boolCreateDirectory = access.CreateDirectory(directoryName);

      Console.WriteLine("建立zzz目录_预期成功:"+boolCreateDirectory);

      // 建立zzz目录_预期成功_预期根目录下有zzz目录
      // 预设根目录下有三个目录：tmp、user、zzz
      var expectedCreateDirectory = new List() { "tmp", "user", directoryName, };

      var actualCreateDirectory = access.GetDirectories(@"/");


      foreach (var item in actualCreateDirectory)
      {
        Console.WriteLine(item);
      }

      Console.WriteLine("********************************************");
      // 删除zzz目录
      var boolDeleteDirectory = access.DeleteDirectory(directoryName);

      Console.WriteLine("删除zzz目录_预期成功:" + boolDeleteDirectory);


      // 删除zzz目录_预期成功_预期根目录下无zzz目录
      // 预设根目录下有两个目录：tmp、user
      var expectedDeleteDirectory = new List() { "tmp", "user", };

      var actualDeleteDirectory = access.GetDirectories(@"/");

      foreach (var item in actualDeleteDirectory)
      {
        Console.WriteLine(item);
      }
    }

    //_建立Test档案_预期根目录下有Test档案_删除Test档案_预期成功_预期根目录下无Test档案
    public static void FileTest()
    {
      var localFile = Path.Combine(Directory.GetCurrentDirectory(), "TestFolder", "Test.jpg");

      var remotePath = "Test.jpg";

      // 建立Test档案
      var boolCreateFile = access.CreateFile(localFile, remotePath);

      // 建立Test档案_预期根目录下有Test档案
      var expectedCreateFile = new List() { remotePath, };

      var actualCreateFile = access.GetFiles(@"/");

      foreach (var item in actualCreateFile)
      {
        Console.WriteLine(item);
      }
      Console.WriteLine("********************************************");
      // 删除Test档案
      var boolDeleteFile = access.DeleteDirectory(remotePath);

      Console.WriteLine("删除Test档案_预期成功:"+boolDeleteFile);

      // 删除Test档案_预期成功_预期根目录下无Test档案
      var expectedDeleteFile = new List();

      var actualDeleteFile = access.GetFiles(@"/");

      foreach (var item in actualDeleteFile)
      {
        Console.WriteLine(item);
      }
    }

    //_建立Test档案_预期根目录下有Test档案_取得Test档案_预期成功_预期回传Test档案Stream并转存成功
    public static void OpenFileTest()
    {
      var localFile = Path.Combine(Directory.GetCurrentDirectory(), "TestFolder", "Test.jpg");
      var remotePath = "Test.jpg";
      var saveFile = Path.Combine(Directory.GetCurrentDirectory(), "Test.jpg");

      Console.WriteLine("saveFile:" + saveFile);
      Console.WriteLine("********************************************");
      // 建立Test档案
      var boolCreateFile = access.CreateFile(localFile, remotePath);

      // 建立Test档案_预期根目录下有Test档案
      var expectedCreateFile = new List() { remotePath, };

      var actualCreateFile = access.GetFiles(@"/");

      foreach (var item in actualCreateFile)
      {
        Console.WriteLine(item);
      }


      Console.WriteLine("********************************************");
      // 取得Test档案
      var response = access.OpenFile(remotePath);

      // 取得Test档案_预期成功
      response.EnsureSuccessStatusCode();

      // 取得Test档案_预期成功_预期回传Test档案Stream并转存成功
      using (var fs = File.Create(saveFile))
      {
        response.Content.CopyToAsync(fs).Wait();
      }

      Console.WriteLine(File.Exists(saveFile));

    }
  }
}

运行结果如图:

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