Wie ASP.NET das Hinzufügen, Löschen, Ändern und Abfragen von Hadoop implementiert-C#.Net-Tutorial-php.cn

In diesem Artikel wird hauptsächlich der Beispielcode von ASP.NET zum Implementieren des Hinzufügens, Löschens, Änderns und Abfragens von Hadoop vorgestellt. Der Herausgeber findet ihn recht gut, daher werde ich ihn jetzt mit Ihnen teilen und als Referenz verwenden. Lassen Sie uns dem Editor folgen und einen Blick darauf werfen.

Dieser Artikel stellt den Beispielcode von ASP.NET zum Implementieren des Hinzufügens, Löschens, Änderns und Abfragens vor. Die Details sind wie folgt :

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
 <package id="Microsoft.AspNet.WebApi.Client" version="4.0.20505.0" targetFramework="net46" />
 <package id="Microsoft.Data.Edm" version="5.2.0" targetFramework="net46" />
 <package id="Microsoft.Data.OData" version="5.2.0" targetFramework="net46" />
 <package id="Microsoft.Hadoop.WebClient" version="0.12.5126.42915" targetFramework="net46" />
 <package id="Microsoft.Net.Http" version="2.0.20505.0" targetFramework="net46" />
 <package id="Microsoft.WindowsAzure.ConfigurationManager" version="1.8.0.0" targetFramework="net46" />
 <package id="Newtonsoft.Json" version="4.5.11" targetFramework="net46" />
 <package id="System.Spatial" version="5.2.0" targetFramework="net46" />
 <package id="WindowsAzure.Storage" version="2.0.4.1" targetFramework="net46" />
</packages>

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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<string> GetDirectories(string path)
    {
      var directoryStatus = this.webHDFSClient.GetDirectoryStatus(path).Result;

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

    public List<string> 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;
    }
  }
}

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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<string>() { "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<string>();

      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<string>() { "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<string>() { "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<string>() { 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<string>();

      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<string>() { 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));

    }
  }
}

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Das laufende Ergebnis ist wie in der Abbildung dargestellt:

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