分片上传
前端
@{ Layout = null; } <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>Index</title> <script src="/lib/jquery/dist/jquery.js"></script> <script> var UploadPath = ""; //开始上传 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, //总大小shardSize = 2 * 1024 * 1024, shardSize = 2 * 1024 * 1024,//以2MB为一个分片 shardCount = Math.ceil(size / shardSize); //总片数 if (i >= shardCount) { return; } //计算每一片的起始与结束位置 var start = i * shardSize, end = Math.min(size, start + shardSize); //构造一个表单，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); //总片数 form.append("index", i + 1); //当前是第几片 UploadPath = file.lastModified //Ajax提交文件 $.ajax({ url: "/Upload/UploadFile", type: "POST", data: form, async: true, //异步 processData: false, //很重要，告诉jquery不要对form进行处理 contentType: false, //很重要，指定为false才能形成正确的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 $('#upfile').val('请选择文件'); alert("success!!!"); } } } }); } </script> </head> <body> <div class="row" style="margin-top:20%"> <div class="col-lg-4"></div> <div class="col-lg-4"> <input type="text" value="请选择文件" size="20" name="upfile" id="upfile" style="border:1px dotted #ccc"> <input type="button" value="浏览" οnclick="path.click()" style="border:1px solid #ccc;background:#fff"> <input type="file" id="path" style="display:none" multiple="multiple" οnchange="upfile.value=this.value"> <br /> <span id="output">0%</span> <button type="button" id="file" οnclick="UploadStart()" style="border:1px solid #ccc;background:#fff">开始上传</button> </div> <div class="col-lg-4"></div> </div> </body> </html>
后端：
using Microsoft.AspNetCore.Mvc; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Threading.Tasks; namespace HUCAI.Core.WebApplication.Controllers { public class UploadController : Controller { public IActionResult Index() { return View(); } [HttpPost] public async Task<ActionResult> UploadFile() { var data = Request.Form.Files["data"]; string lastModified = Request.Form["lastModified"].ToString(); var total = Request.Form["total"]; var fileName = Request.Form["fileName"]; var index = Request.Form["index"]; string temporary = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/", lastModified);//临时保存分块的目录 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);//删除文件夹 throw ex; } } public async Task<bool> FileMerge(string lastModified, string fileName) { bool ok = false; try { var temporary = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/", lastModified);//临时文件夹 fileName = Request.Form["fileName"];//文件名 string fileExt = Path.GetExtension(fileName);//获取文件后缀 var files = Directory.GetFiles(temporary);//获得下面的所有文件 var finalPath = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/", DateTime.Now.ToString("yyMMddHHmmss") + fileExt);//最终的文件名（demo中保存的是它上传时候的文件名，实际操作肯定不能这样） var fs = new FileStream(finalPath, FileMode.Create); foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))//排一下序，保证从0-N Write { var bytes = System.IO.File.ReadAllBytes(part); await fs.WriteAsync(bytes, 0, bytes.Length); bytes = null; System.IO.File.Delete(part);//删除分块 } fs.Close(); Directory.Delete(temporary);//删除文件夹 ok = true; } catch (Exception ex) { throw ex; } return ok; } } }
