寫完asp.net多文件上傳后,感覺這種上傳還是有很多缺陷,于是。。。(省略一萬字,不廢話)。這里我沒用傳統的asp.net,而選擇了開源的asp.net core,原因很簡單,.net core是.net新的開始,更是.net和.net開發者的未來,希望.net發展越來越好(大家的工資越來越高(●ˇ∀ˇ●))。
1.前端的實現:
1).html:
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< 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" style = "margin-top:20%" > < 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" 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 > </ div > < div class = "col-lg-4" ></ div > </ div > </ body > </ html > |
2).javascript:
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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#:
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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; } } } |
這里的思路就是先保存每一個分塊的文件到一個臨時文件夾,最后再通過FileStream合并這些臨時文件(合并時必需要按順序)。后臺的方法都進行了異步化(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.rar
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持服務器之家。
原文鏈接:http://www.cnblogs.com/bestckk/p/6103065.html