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！
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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