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這篇文章將為大家詳細講解有關怎么在asp.net 中實現分塊上傳文件,文章內容質量較高,因此小編分享給大家做個參考,希望大家閱讀完這篇文章后對相關知識有一定的了解。
1.前端的實現:
1).html:
<html> <head> <meta name="viewport" content="width=device-width" /> <title>Index</title> <link href="/lib/bootstrap/dist/css/bootstrap.css" rel="external nofollow" rel="stylesheet" /> <script src="/lib/jquery/dist/jquery.js"></script> <script src="/lib/bootstrap/dist/js/bootstrap.js"></script> <script src="/js/UploadJs.js"></script> </head> <body> <div class="row" > <div class="col-lg-4"></div> <div class="col-lg-4"> <input type="text" value="請選擇文件" size="20" name="upfile" id="upfile" > <input type="button" value="瀏覽" onclick="path.click()" > <input type="file" id="path" multiple="multiple" onchange="upfile.value=this.value"> <br /> <span id="output">0%</span> <button type="button" id="file" onclick="UploadStart()" >開始上傳</button> </div> <div class="col-lg-4"></div> </div> </body> </html>
2).javascript:
var UploadPath = ""; //開始上傳 function UploadStart() { var file = $("#path")[0].files[0]; AjaxFile(file, 0); } function AjaxFile(file, i) { var name = file.name, //文件名 size = file.size, //總大小shardSize = 2 * 1024 * 1024, shardSize = 2 * 1024 * 1024,//以2MB為一個分片 shardCount = Math.ceil(size / shardSize); //總片數 if (i >= shardCount) { return; } //計算每一片的起始與結束位置 var start = i * shardSize, end = Math.min(size, start + shardSize); //構造一個表單,FormData是HTML5新增的 var form = new FormData(); form.append("data", file.slice(start, end)); //slice方法用于切出文件的一部分 form.append("lastModified", file.lastModified); form.append("fileName", name); form.append("total", shardCount); //總片數 form.append("index", i + 1); //當前是第幾片 UploadPath = file.lastModified //Ajax提交文件 $.ajax({ url: "/Upload/UploadFile", type: "POST", data: form, async: true, //異步 processData: false, //很重要,告訴jquery不要對form進行處理 contentType: false, //很重要,指定為false才能形成正確的Content-Type success: function (result) { if (result != null) { i = result.number++; var num = Math.ceil(i * 100 / shardCount); $("#output").text(num + '%'); AjaxFile(file, i); if (result.mergeOk) { var filepath = $("#path"); filepath.after(filepath.clone().val("")); filepath.remove();//清空input file $('#upfile').val('請選擇文件'); alert("success!!!"); } } } }); }
這里的主要思路是利用html5 File api的slice方法把文件分塊,然后new一個FormData()對象用于儲存文件數據,之后就是遞歸調用AjaxFile方法直至上傳完畢。
2.后臺C#:
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Mvc; using System.IO; // For more information on enabling MVC for empty projects, visit http://go.microsoft.com/fwlink/?LinkID=397860 namespace DotNet.Upload.Controllers { public class UploadController : Controller { // GET: /<controller>/ public IActionResult Index() { return View(); } [HttpPost] public async Task<ActionResult> UploadFile() { var data = Request.Form.Files["data"]; string lastModified = Request.Form["lastModified"].ToString(); var total = Request.Form["total"]; var fileName = Request.Form["fileName"]; var index = Request.Form["index"]; string temporary = Path.Combine(@"E:\瀏覽器", lastModified);//臨時保存分塊的目錄 try { if (!Directory.Exists(temporary)) Directory.CreateDirectory(temporary); string filePath = Path.Combine(temporary, index.ToString()); if (!Convert.IsDBNull(data)) { await Task.Run(() => { FileStream fs = new FileStream(filePath, FileMode.Create); data.CopyTo(fs); }); } bool mergeOk = false; if (total == index) { mergeOk = await FileMerge(lastModified, fileName); } Dictionary<string, object> result = new Dictionary<string, object>(); result.Add("number", index); result.Add("mergeOk", mergeOk); return Json(result); } catch (Exception ex) { Directory.Delete(temporary);//刪除文件夾 throw ex; } } public async Task<bool> FileMerge(string lastModified,string fileName) { bool ok = false; try { var temporary = Path.Combine(@"E:\瀏覽器", lastModified);//臨時文件夾 fileName = Request.Form["fileName"];//文件名 string fileExt = Path.GetExtension(fileName);//獲取文件后綴 var files = Directory.GetFiles(temporary);//獲得下面的所有文件 var finalPath = Path.Combine(@"E:\瀏覽器", DateTime.Now.ToString("yyMMddHHmmss") + fileExt);//最終的文件名(demo中保存的是它上傳時候的文件名,實際操作肯定不能這樣) var fs = new FileStream(finalPath, FileMode.Create); foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))//排一下序,保證從0-N Write { var bytes = System.IO.File.ReadAllBytes(part); await fs.WriteAsync(bytes, 0, bytes.Length); bytes = null; System.IO.File.Delete(part);//刪除分塊 } fs.Close(); Directory.Delete(temporary);//刪除文件夾 ok = true; } catch (Exception ex) { throw ex; } return ok; } } }
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