8
我試圖通過它的Angular包裝器（https://github.com/flowjs/ng-flow/tree/master/samples/basic）使用flow.js（https://github.com/flowjs/flow.js）將文件上傳到ASP.NET WebAPI 2服務器。無論如何，當我選擇一個文件上傳我的WebAPI只是得到第一個塊GET請求，然後什麼都沒有發生：沒有POST完成，似乎flow.js沒有開始上傳。使用flow.js + ng-flow將文件上傳到WebAPI 2
最初被解僱時，我選擇一個文件是：
GET http://localhost:49330/api/upload?flowChunkNumber=1&flowChunkSize=1048576&flowCurrentChunkSize=4751&flowTotalSize=4751&flowIdentifier=4751-ElmahMySqlsql&flowFilename=Elmah.MySql.sql&flowRelativePath=Elmah.MySql.sql&flowTotalChunks=1 HTTP/1.1
Host: localhost:49330
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36
Accept: */*
Referer: http://localhost:49330/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,it;q=0.6
和響應是：
HTTP/1.1 202 Accepted
Cache-Control: no-cache
Pragma: no-cache
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcUHJvamVjdHNcNDViXFRlc3RcVXBUZXN0XFVwVGVzdFxhcGlcdXBsb2Fk?=
X-Powered-By: ASP.NET
Date: Fri, 17 Apr 2015 08:02:56 GMT
Content-Length: 0
然後，沒有更多的請求發出。
因爲它似乎沒有最新的WebAPI示例，但只有分散的帖子，我爲像我這樣的新手創建了一個虛擬的repro解決方案，您可以從http://1drv.ms/1CSF5jq下載：這是一個ASP.NET WebAPI 2解決方案，在添加相應的API控制器後，在主視圖中上傳代碼。只需點擊F5並嘗試上傳文件。你可以在UploadController.cs找到API控制器。
相關的代碼部分是：
一個）客戶端：類似於納克流頁的快速啓動一例的頁面：
<div class="row">
<div class="col-md-12">
<div flow-init="{target: '/api/upload'}"
flow-files-submitted="$flow.upload()"
flow-file-success="$file.msg = $message">
<input type="file" flow-btn />
<ol>
<li ng-repeat="file in $flow.files">{{file.name}}: {{file.msg}}</li>
</ol>
</div>
</div>
</div>
相應的代碼基本上是一個空TS骨架與模塊初始化：
module Up {
export interface IMainScope {
}
export class MainController {
public static $inject = ["$scope"];
constructor(private $scope: IMainScope) {
}
}
var app = angular.module("app", ["flow"]);
app.controller("mainController", MainController);
}
b）中服務器側：我爲所需的腳本添加了一些補丁，並添加了以下控制器，這些控制器是從How to upload file in chunks in ASP.NET using ng-Flow中找到的示例代碼修改而來的。請注意，在GET Upload方法中，我使用綁定模型更改了簽名（否則我們將得到404，因爲路由未匹配），並且當未找到塊時，我會返回202 - Accepted代碼而不是404，因爲flow.js文檔說200對應於「塊被接受並且正確，不需要重新上傳」，而404取消了整個上傳，而其他任何代碼（如202這裏）都會告訴上傳者重試。
[RoutePrefix("api")]
public class UploadController : ApiController
{
private readonly string _sRoot;
public UploadController()
{
_sRoot = HostingEnvironment.MapPath("~/App_Data/Uploads");
}
[Route("upload"), AcceptVerbs("GET")]
public IHttpActionResult Upload([FromUri] UploadBindingModel model)
{
if (IsChunkHere(model.FlowChunkNumber, model.FlowIdentifier)) return Ok();
return ResponseMessage(new HttpResponseMessage(HttpStatusCode.Accepted));
}
[Route("upload"), AcceptVerbs("POST")]
public async Task<IHttpActionResult> Upload()
{
// ensure that the request contains multipart/form-data
if (!Request.Content.IsMimeMultipartContent())
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
if (!Directory.Exists(_sRoot)) Directory.CreateDirectory(_sRoot);
MultipartFormDataStreamProvider provider =
new MultipartFormDataStreamProvider(_sRoot);
try
{
await Request.Content.ReadAsMultipartAsync(provider);
int nChunkNumber = Convert.ToInt32(provider.FormData["flowChunkNumber"]);
int nTotalChunks = Convert.ToInt32(provider.FormData["flowTotalChunks"]);
string sIdentifier = provider.FormData["flowIdentifier"];
string sFileName = provider.FormData["flowFilename"];
// rename the generated file
MultipartFileData chunk = provider.FileData[0]; // Only one file in multipart message
RenameChunk(chunk, nChunkNumber, sIdentifier);
// assemble chunks into single file if they're all here
TryAssembleFile(sIdentifier, nTotalChunks, sFileName);
return Ok();
}
catch (Exception ex)
{
return InternalServerError(ex);
}
}
private string GetChunkFileName(int chunkNumber, string identifier)
{
return Path.Combine(_sRoot,
String.Format(CultureInfo.InvariantCulture, "{0}_{1}",
identifier, chunkNumber));
}
private void RenameChunk(MultipartFileData chunk, int chunkNumber, string identifier)
{
string sGeneratedFileName = chunk.LocalFileName;
string sChunkFileName = GetChunkFileName(chunkNumber, identifier);
if (File.Exists(sChunkFileName)) File.Delete(sChunkFileName);
File.Move(sGeneratedFileName, sChunkFileName);
}
private string GetFileName(string identifier)
{
return Path.Combine(_sRoot, identifier);
}
private bool IsChunkHere(int chunkNumber, string identifier)
{
string sFileName = GetChunkFileName(chunkNumber, identifier);
return File.Exists(sFileName);
}
private bool AreAllChunksHere(string identifier, int totalChunks)
{
for (int nChunkNumber = 1; nChunkNumber <= totalChunks; nChunkNumber++)
if (!IsChunkHere(nChunkNumber, identifier)) return false;
return true;
}
private void TryAssembleFile(string identifier, int totalChunks, string filename)
{
if (!AreAllChunksHere(identifier, totalChunks)) return;
// create a single file
string sConsolidatedFileName = GetFileName(identifier);
using (Stream destStream = File.Create(sConsolidatedFileName, 15000))
{
for (int nChunkNumber = 1; nChunkNumber <= totalChunks; nChunkNumber++)
{
string sChunkFileName = GetChunkFileName(nChunkNumber, identifier);
using (Stream sourceStream = File.OpenRead(sChunkFileName))
{
sourceStream.CopyTo(destStream);
}
} //efor
destStream.Close();
}
// rename consolidated with original name of upload
// strip to filename if directory is specified (avoid cross-directory attack)
filename = Path.GetFileName(filename);
Debug.Assert(filename != null);
string sRealFileName = Path.Combine(_sRoot, filename);
if (File.Exists(filename)) File.Delete(sRealFileName);
File.Move(sConsolidatedFileName, sRealFileName);
// delete chunk files
for (int nChunkNumber = 1; nChunkNumber <= totalChunks; nChunkNumber++)
{
string sChunkFileName = GetChunkFileName(nChunkNumber, identifier);
File.Delete(sChunkFileName);
} //efor
}
}
我必須添加，根據https://github.com/flowjs/ng-flow/issues/144和貌似與文檔形成對比，似乎404應該從GET返回時，塊沒有找到。我嘗試過，但沒有任何變化，沒有開始上傳。 – Naftis