ASP.NET實現(xiàn)Hadoop增刪改查的示例代碼

更新時間：2017年10月12日 10:19:57 作者：逆世風靈

本篇文章主要介紹了ASP.NET實現(xiàn)Hadoop增刪改查的示例代碼，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

本文介紹了ASP.NET實現(xiàn)Hadoop增刪改查的示例代碼，分享給大家，具體如下：

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>

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)
    {
      // 傳入路徑不包含根目錄時，預設會在根目錄「/」底下
      return this.webHDFSClient.CreateDirectory(path).Result;
    }

    public bool DeleteDirectory(string path)
    {
      // 傳入路徑不包含根目錄時，預設會在根目錄「/」底下
      return this.webHDFSClient.DeleteDirectory(path).Result;
    }

    public string CreateFile(string localFile, string remotePath)
    {
      // 傳入遠端路徑不包含根目錄時，預設會在根目錄「/」底下
      return this.webHDFSClient.CreateFile(localFile, remotePath).Result;
    }

    public bool DeleteFile(string path)
    {
      // 傳入路徑不包含根目錄時，預設會在根目錄「/」底下
      return this.webHDFSClient.DeleteDirectory(path).Result;
    }

    public HttpResponseMessage OpenFile(string path)
    {
      // 傳入路徑不包含根目錄時，預設會在根目錄「/」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 客戶端進入端點設定于 主機上
    // 預設端點：http://[主機名稱]:50070
    // 預設帳號：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()
    {
      //取得根目錄資料夾
      var directories = access.GetDirectories(@"/");

      // 移除預設目錄：tmp、user 外的目錄
      foreach (var directory in directories)
      {
        if ("tmp".Equals(directory) || "user".Equals(directory))
        {
          continue;
        }
        else
        {
          access.DeleteDirectory(directory);
        }
      }

      // 取得根目錄檔案
      var files = access.GetFiles(@"/");

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

      // 移除 OpenFile 轉存檔案
      File.Delete(Path.Combine(Directory.GetCurrentDirectory(), "Test.jpg"));
    }

    //_傳入根目錄_預期回傳預設目錄
    public static void GetDirectoriesTest()
    {
      // 預設根目錄下有兩個目錄：tmp、user
      var expected = new List<string>() { "tmp", "user", };

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

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

    }

    //_傳入根目錄_預期回傳空集合
    public static void GetFilesTest()
    {
      // 預設根目錄下沒有檔案
      var expected = new List<string>();

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

    }

    //_建立zzz目錄_預期成功_預期根目錄下有zzz目錄_刪除zzz目錄_預期成功_預期根目錄下無zzz目錄
    public static void DirectoryTest()
    {
      var directoryName = "zzz";

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

      Console.WriteLine("建立zzz目錄_預期成功:"+boolCreateDirectory);

      // 建立zzz目錄_預期成功_預期根目錄下有zzz目錄
      // 預設根目錄下有三個目錄：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("********************************************");
      // 刪除zzz目錄
      var boolDeleteDirectory = access.DeleteDirectory(directoryName);

      Console.WriteLine("刪除zzz目錄_預期成功:" + boolDeleteDirectory);


      // 刪除zzz目錄_預期成功_預期根目錄下無zzz目錄
      // 預設根目錄下有兩個目錄：tmp、user
      var expectedDeleteDirectory = new List<string>() { "tmp", "user", };

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

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

    //_建立Test檔案_預期根目錄下有Test檔案_刪除Test檔案_預期成功_預期根目錄下無Test檔案
    public static void FileTest()
    {
      var localFile = Path.Combine(Directory.GetCurrentDirectory(), "TestFolder", "Test.jpg");

      var remotePath = "Test.jpg";

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

      // 建立Test檔案_預期根目錄下有Test檔案
      var expectedCreateFile = new List<string>() { remotePath, };

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

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

      Console.WriteLine("刪除Test檔案_預期成功:"+boolDeleteFile);

      // 刪除Test檔案_預期成功_預期根目錄下無Test檔案
      var expectedDeleteFile = new List<string>();

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

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

    //_建立Test檔案_預期根目錄下有Test檔案_取得Test檔案_預期成功_預期回傳Test檔案Stream并轉存成功
    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檔案
      var boolCreateFile = access.CreateFile(localFile, remotePath);

      // 建立Test檔案_預期根目錄下有Test檔案
      var expectedCreateFile = new List<string>() { remotePath, };

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

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


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

      // 取得Test檔案_預期成功
      response.EnsureSuccessStatusCode();

      // 取得Test檔案_預期成功_預期回傳Test檔案Stream并轉存成功
      using (var fs = File.Create(saveFile))
      {
        response.Content.CopyToAsync(fs).Wait();
      }

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

    }
  }
}

運行結果如圖: