本文介绍了ASP.NET实现Hadoop增删改查的示例代码,分享给大家,具体如下:
packages.config
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<? 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
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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
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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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运行结果如图:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/wulex/article/details/78122095