如何使用MVC 4上传大文件？

Question

我有它工作..但我注意到，一旦我上传的文件变大（大约4000k）控制器就不会被调用..

所以我在chunking中添加了修复该问题的内容..但是现在当我打开文件时，它充满了垃圾字符......

那么使用plupload / MVC 4上传大文件的正确方法是什么？

这是我目前的代码

  $(document).ready(function () {

    var uploader = new plupload.Uploader({
        runtimes: 'html5',
        browse_button: 'pickfiles',
        container: 'container',
     //   max_file_size: '20000mb',
        url: '@Url.Action("Upload", "Home")',
        chunk_size: '4mb',
        //filters: [
        //    { title: "Excel files", extensions: "xls,xlsx" },
        //    { title: "Text files", extensions: "txt" }
        //],
        multiple_queues: true,
        multipart: true,
        multipart_params: { taskId: '' }
    });

和控制器

  [HttpPost]
    public ActionResult Upload(int? chunk, string name, string taskId)
    {
        string filePath = "";
        var fileUpload = Request.Files[0];
        var uploadPath = Server.MapPath("~/App_Data/Uploads");
        chunk = chunk ?? 0;
        string uploadedFilePath = Path.Combine(uploadPath, name);
        var fileName = Path.GetFileName(uploadedFilePath);

 try
        {
            using (var fs = new FileStream(filePath, chunk == 0 ? FileMode.Create : FileMode.Append))
            {
                var buffer = new byte[fileUpload.InputStream.Length];
                fileUpload.InputStream.Read(buffer, 0, buffer.Length);
                fs.Write(buffer, 0, buffer.Length);
            }

            //Log to DB for future processing
            InstanceExpert.AddProcessStart(filePath, Int32.Parse(taskId));
        }

Answer 1

在web.config中你需要这些（2GB全部）：

<system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647" />
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2147483647" />
      </requestFiltering>
    </security>
    ...
</system.web>

Answer 2

当前版本

根据我编写此答案时使用的IIS 8.0的详细错误说明，您需要验证configuration/system.webServer/security/requestFiltering/requestLimits或{{ApplicationHost.config @ maxAllowedContentLength设置3}}文件。这意味着你需要包括：

<requestLimits maxAllowedContentLength="20971520000"></requestLimits>

内部配置/ system.webServer / security / requestFiltering标签树。如果你缺乏想象力去想象它的去向，那么完整的代码块如下：

<configuration>
    <system.webServer>
        <security>
            <requestFiltering>
                <requestLimits maxAllowedContentLength="20971520000"></requestLimits>
            </requestFiltering>
        </security>
    </system.webServer>
</configuration>

Visual Studio 2010 / .Net Framework 4及之前

使用VS2008 / 10和/或.Net Framework 3.5 / 4创建的旧版Web应用程序也可能仍在通过Web.config @ maxRequestLength查找此配置，但是如链接页面所示，它虽然configuration/system.web/httpRuntime不适用于此方案，但自.Net Framework 1.1以来仍然存在。如果是这种情况，您需要包括：

<httpRuntime maxRequestLength="20971520000" />

内部配置/ system.web / httpRuntime标签树。再一次，为了防止您无法理解它的插入位置，完整的代码块看起来如下所示：

<configuration>
    <system.web>
        <httpRuntime maxRequestLength="20971520000" />
    </system.web>
</configuration>

文件大小编号只是一个任意数字（20,000 MB - 而不是20 GB，而不是21,474,836,480）作为演示显示。除非您为需要上传大文件的严格安全组编码网站，否则不应允许将这么大的文件大小上传到您的Web服务器。

Answer 3

解决方案基于Jonathan's code here。如果你想上传一个大文件，比如1Gbyte视频文件，你必须扔掉文件并通过几个请求发送它（一个请求给出超时）。首先在 Web.config 中设置客户端和服务器端的最大限制，如其他答案中所述。

<system.webServer>
 <security>
  <requestFiltering>
    <requestLimits maxAllowedContentLength="2147483647" />
  </requestFiltering>
 </security>
<system.webServer>

和

<system.web>
  <httpRuntime targetFramework="4.5" maxRequestLength="2147483647" />
</system.web>

然后将文件分块，并发送每个chuck，等待响应并发送下一个块。这里是html（ VideoDiv 作为上传面板工作），javascript（jQuery）和控制器代码。

    <div id="VideoDiv">
        <label>Filename:</label>
        <input type="file" id="fileInput" /><br/><br/>
        <input type="button" id="btnUpload" value="Upload a presentation"/><br/><br/>
        <div id="progressbar_container" style="width: 100%; height: 30px; position: relative; background-color: grey; display: none">
            <div id="progressbar" style="width: 0%; height: 100%; position: absolute; background-color: green"></div>
            <span id="progressbar_label" style="position: absolute; left: 35%; top: 20%">Uploading...</span>
        </div>
    </div>

要查询的Javascript代码，调用控制器并更新进度条：

        var progressBarStart = function() {
            $("#progressbar_container").show();
        }

        var progressBarUpdate = function (percentage) {
            $('#progressbar_label').html(percentage + "%");
            $("#progressbar").width(percentage + "%");
        }

        var progressBarComplete = function() {
            $("#progressbar_container").fadeOut(500);
        }

        var file;

        $('#fileInput').change(function(e) {
            file = e.target.files[0];
        });

        var uploadCompleted = function() {
            var formData = new FormData();
            formData.append('fileName', file.name);
            formData.append('completed', true);

            var xhr2 = new XMLHttpRequest();
            xhr2.onload = function() {
                progressBarUpdate(100);
                progressBarComplete();
            }
            xhr2.open("POST", "/Upload/UploadComplete?fileName=" + file.name + "&complete=" + 1, true);
            xhr2.send(formData);
        }

        var multiUpload = function(count, counter, blob, completed, start, end, bytesPerChunk) {
            counter = counter + 1;
            if (counter <= count) {
                var chunk = blob.slice(start, end);
                var xhr = new XMLHttpRequest();
                xhr.onload = function() {
                    start = end;
                    end = start + bytesPerChunk;
                    if (count == counter) {
                        uploadCompleted();
                    } else {
                        var percentage = (counter / count) * 100;
                        progressBarUpdate(percentage);
                        multiUpload(count, counter, blob, completed, start, end, bytesPerChunk);
                    }
                }
                xhr.open("POST", "/Upload/MultiUpload?id=" + counter.toString() + "&fileName=" + file.name, true);
                xhr.send(chunk);
            }
        }

        $("#VideoDiv").on("click", "#btnUpload", function() {
            var blob = file;
            var bytesPerChunk = 3757000;
            var size = blob.size;

            var start = 0;
            var end = bytesPerChunk;
            var completed = 0;
            var count = size % bytesPerChunk == 0 ? size / bytesPerChunk : Math.floor(size / bytesPerChunk) + 1;
            var counter = 0;
            progressBarStart();
            multiUpload(count, counter, blob, completed, start, end, bytesPerChunk);
        });

这里是上传控制器，用于存储chucnk（“App_Data / Videos / Temp”），然后合并它们并存储在（“App_Data / Videos”）中：

public class UploadController : Controller
{
    private string videoAddress = "~/App_Data/Videos";

    [HttpPost]
    public string MultiUpload(string id, string fileName)
    {
        var chunkNumber = id;
        var chunks = Request.InputStream;
        string path = Server.MapPath(videoAddress+"/Temp");
        string newpath = Path.Combine(path, fileName+chunkNumber);
        using (FileStream fs = System.IO.File.Create(newpath))
        {
            byte[] bytes = new byte[3757000];
            int bytesRead;
            while ((bytesRead=Request.InputStream.Read(bytes,0,bytes.Length))>0)
            {
                fs.Write(bytes,0,bytesRead);
            }
        }
        return "done";
    }

    [HttpPost]
    public string UploadComplete(string fileName, string complete)
    {
        string tempPath = Server.MapPath(videoAddress + "/Temp");
        string videoPath = Server.MapPath(videoAddress);
        string newPath = Path.Combine(tempPath, fileName);
        if (complete=="1")
        {
            string[] filePaths = Directory.GetFiles(tempPath).Where(p=>p.Contains(fileName)).OrderBy(p => Int32.Parse(p.Replace(fileName, "$").Split('$')[1])).ToArray();
            foreach (string filePath in filePaths)
            {
                MergeFiles(newPath, filePath);
            }
        }
        System.IO.File.Move(Path.Combine(tempPath, fileName),Path.Combine(videoPath,fileName));
        return "success";
    }

    private static void MergeFiles(string file1, string file2)
    {
        FileStream fs1 = null;
        FileStream fs2 = null;
        try
        {
            fs1 = System.IO.File.Open(file1, FileMode.Append);
            fs2 = System.IO.File.Open(file2, FileMode.Open);
            byte[] fs2Content = new byte[fs2.Length];
            fs2.Read(fs2Content, 0, (int) fs2.Length);
            fs1.Write(fs2Content, 0, (int) fs2.Length);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message + " : " + ex.StackTrace);
        }
        finally
        {
            if (fs1 != null) fs1.Close();
            if (fs2 != null) fs2.Close();
            System.IO.File.Delete(file2);
        }
    }
}

但是，如果两个用户同时上传具有相同名称的文件，则会出现一些问题，您必须处理此问题。通过阅读responseText，您可以捕获一些错误和异常并修剪它。