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這篇文章主要介紹了H5+WebSocket如何實(shí)現(xiàn)多文件同時(shí)上傳,具有一定借鑒價(jià)值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
在傳統(tǒng)的HTTP應(yīng)用上傳文件想要同時(shí)上傳多個(gè)文件并查看上傳進(jìn)度是一件很麻煩的事情,當(dāng)然現(xiàn)在也有一些基于SWF的文件上傳組件提供這種的便利性.到了HTML5下對(duì)文件的讀取和上傳的控制方面就非常靈活,HTML5提供一系列的AIP進(jìn)行文件讀取,包括計(jì)取文件某一塊的內(nèi)容也非常方便,結(jié)合Websocket進(jìn)行文件的傳輸就變得更加方便和靈活.下面通過(guò)使用HTML5結(jié)合websocet簡(jiǎn)單地實(shí)現(xiàn)多文件同時(shí)上傳應(yīng)用.
實(shí)現(xiàn)功能
大概預(yù)覽一下需要做的功能:
主要功能是用戶(hù)可以直接把文件夾的文件直接拖放到網(wǎng)頁(yè)中,并進(jìn)行上傳,在上傳的過(guò)程中顯示上傳進(jìn)度信息.
FileInfo類(lèi)封裝
為了方便讀取文件信息,在原有File的基礎(chǔ)封裝了一個(gè)簡(jiǎn)單文件信息讀取的對(duì)象類(lèi).
function FileInfo(file, pagesize) { this.Size = file.size; this.File = file; this.FileType = file.type; this.FileName = file.name; this.PageSize = pagesize; this.PageIndex = 0; this.Pages = 0; this.UploadError = null; this.UploadProcess = null; this.DataBuffer = null; this.UploadBytes = 0; this.ID = Math.floor(Math.random() * 0x10000).toString(16); this.LoadCallBack = null; if (Math.floor(this.Size % this.PageSize) > 0) { this.Pages = Math.floor((this.Size / this.PageSize)) + 1; } else { this.Pages = Math.floor(this.Size / this.PageSize); } } FileInfo.prototype.Reset = function () { this.PageIndex = 0; this.UploadBytes = 0; } FileInfo.prototype.toBase64String = function () { var binary = '' var bytes = new Uint8Array(this.DataBuffer) var len = bytes.byteLength; for (var i = 0; i < len; i++) { binary += String.fromCharCode(bytes[i]) } return window.btoa(binary); } FileInfo.prototype.OnLoadData = function (evt) { var obj = evt.target["tag"]; if (evt.target.readyState == FileReader.DONE) { obj.DataBuffer = evt.target.result; if (obj.LoadCallBack != null) obj.LoadCallBack(obj); } else { if (obj.UploadError != null) obj.UploadError(fi, evt.target.error); } } FileInfo.prototype.Load = function (completed) { this.LoadCallBack = completed; if (this.filereader == null || this.filereader == undefined) this.filereader = new FileReader(); var reader = this.filereader; reader["tag"] = this; reader.onloadend = this.OnLoadData; var count = this.Size - this.PageIndex * this.PageSize; if (count > this.PageSize) count = this.PageSize; this.UploadBytes += count; var blob = this.File.slice(this.PageIndex * this.PageSize, this.PageIndex * this.PageSize + count); reader.readAsArrayBuffer(blob); }; FileInfo.prototype.OnUploadData = function (file) { var channel = file._channel; var url = file._url; channel.Send({ url: url, parameters: { FileID: file.ID, PageIndex: file.PageIndex, Pages: file.Pages, Base64Data: file.toBase64String()} }, function (result) { if (result.status == null || result.status == undefined) { file.PageIndex++; if (file.UploadProcess != null) file.UploadProcess(file); if (file.PageIndex < file.Pages) { file.Load(file.OnUploadData); } } else { if (file.UploadError != null) file.UploadError(file, data.status); } }); } FileInfo.prototype.Upload = function (channel, url) { var fi = this; channel.Send({ url: url, parameters: { FileName: fi.FileName, Size: fi.Size, FileID: fi.ID} }, function (result) { if (result.status == null || result.status == undefined) { fi._channel = channel; fi._url = result.data; fi.Load(fi.OnUploadData); } else { if (file.UploadError != null) file.UploadError(fi, result.status); } }); }
類(lèi)的處理很簡(jiǎn)單,通過(guò)file初始化并指定分塊大小來(lái)實(shí)始化一些文件信息,如頁(yè)數(shù)量頁(yè)大小等.當(dāng)然最重要還封裝文件對(duì)應(yīng)的Upload方法,用于把文件塊信息打包成base64信息通過(guò)Websocket的方式發(fā)送到服務(wù)器.
文件拖放
在HTML5中接受系統(tǒng)文件拖放進(jìn)來(lái)并不需要做復(fù)雜的事情,只需要針對(duì)容器元素綁定相關(guān)事件即可.
function onDragEnter(e) { e.stopPropagation(); e.preventDefault(); } function onDragOver(e) { e.stopPropagation(); e.preventDefault(); $(dropbox).addClass('rounded'); } function onDragLeave(e) { e.stopPropagation(); e.preventDefault(); $(dropbox).removeClass('rounded'); } function onDrop(e) { e.stopPropagation(); e.preventDefault(); $(dropbox).removeClass('rounded'); var readFileSize = 0; var files = e.dataTransfer.files; if (files.length > 0) { onFileOpen(files); } }
只需要在onDrop過(guò)程中獲取相關(guān)拖放文件即可,這些可能通過(guò)一些HTML5的教程可以得到幫助。
這時(shí)候只需要針對(duì)選擇的文件構(gòu)建相關(guān)FileInfo對(duì)象,并調(diào)用上傳方法即可.
function onFileOpen(files) { if (files.length > 0) { for (var i = 0; i < files.length; i++) { var info = new FileInfo(files[i], 32768); uploads.push(info); info.UploadProcess = onUploadProcess; addUploadItem(info); } } }
通過(guò)UploadProcess事件對(duì)上傳文件進(jìn)度信息進(jìn)行一個(gè)設(shè)置更新
function onUploadProcess(file) { $('#p_' + file.ID).progressbar({ value: (file.PageIndex / file.Pages) * 100, text: file.FileName + '[' + file.UploadBytes + '/' + file.Size + ']' }); }
C#服務(wù)端
借助于Beetle對(duì)websocket的支持對(duì)應(yīng)服務(wù)端的實(shí)現(xiàn)就非常簡(jiǎn)單了
/// <summary> /// Copyright ? henryfan 2012 ///CreateTime: 2012/12/14 21:13:34 /// </summary> public class Handler { public void UploadPackage(string FileID, int PageIndex, int Pages, string Base64Data) { Console.WriteLine("FileID:{2},PageIndex:{0} Pages:{1} DataLength:{3}", PageIndex, Pages, FileID,Base64Data.Length); } public string UploadFile(string FileID, string FileName, long Size) { Console.WriteLine("FileID:{2},FileName:{0} Size:{1}", FileName, Size, FileID); return "Handler.UploadPackage"; } }
服務(wù)端方法有兩個(gè)一個(gè)是上傳文件請(qǐng)求,和一個(gè)上傳文件塊接收方法.
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