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> <p class="row" style="margin-top:20%"> <p class="col-lg-4"></p> <p class="col-lg-4"> <input type="text" value="請選擇檔案" size="20" name="upfile" id="upfile" style="border:1px dotted #ccc"> <input type="button" value="瀏覽" onclick="path.click()" style="border:1px solid #ccc;background:#fff"> <input type="file" id="path" style="display:none" multiple="multiple" onchange="upfile.value=this.value"> <br /> <span id="output">0%</span> <button type="button" id="file" onclick="UploadStart()" style="border:1px solid #ccc;background:#fff">開始上傳</button> </p> <p class="col-lg-4"></p> </p></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, //檔案名稱 size = file.size, //總大小shardSize = 2 * 1024 * 1024, shardSize = 2 * 1024 * 1024,//以2MB為一個分區 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方法用於切出檔案的一部分 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提交檔案 $.ajax({ url: "/Upload/UploadFile", type: "POST", data: form, async: true, //非同步 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('請選擇檔案'); alert("success!!!"); } } } });}
這裡的主要思路是利用html5 File api的slice方法把檔案分塊，然後new一個FormData()對象用於儲存檔案資料，之後就是遞迴調用AjaxFile方法直至上傳完畢。
2.後台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://www.php.cn/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);//臨時儲存分塊的目錄 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);//刪除檔案夾 throw ex; } } public async Task<bool> FileMerge(string lastModified,string fileName) { bool ok = false; try { var temporary = Path.Combine(@"E:\瀏覽器", lastModified);//臨時檔案夾 fileName = Request.Form["fileName"];//檔案名稱 string fileExt = Path.GetExtension(fileName);//擷取檔案尾碼 var files = Directory.GetFiles(temporary);//獲得下面的所有檔案 var finalPath = Path.Combine(@"E:\瀏覽器", DateTime.Now.ToString("yyMMddHHmmss") + fileExt);//最終的檔案名稱（demo中儲存的是它上傳時候的檔案名稱，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);//刪除檔案夾 ok = true; } catch (Exception ex) { throw ex; } return ok; } }}
這裡的思路就是先儲存每一個分塊的檔案到一個臨時檔案夾，最後再通過FileStream合并這些臨時檔案（合并時必需要按順序）。背景方法都進行了非同步化（async await真的非常好用），雖然不知道對效率有沒有提升，但是就是覺得這樣很酷。
源碼下載：DotNet_jb51.rar
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