HTML5+WebSocket如何实现多文件同时上传
这篇文章主要介绍了HTML5+WebSocket如何实现多文件同时上传,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
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实现功能
大概预览一下需要做的功能:
主要功能是用户可以直接把文件夹的文件直接拖放到网页中,并进行上传,在上传的过程中显示上传进度信息.
FileInfo类封装
为了方便读取文件信息,在原有File的基础封装了一个简单文件信息读取的对象类.
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); } }); }
类的处理很简单,通过file初始化并指定分块大小来实始化一些文件信息,如页数量页大小等.当然最重要还封装文件对应的Upload方法,用于把文件块信息打包成base64信息通过Websocket的方式发送到服务器.
文件拖放
在HTML5中接受系统文件拖放进来并不需要做复杂的事情,只需要针对容器元素绑定相关事件即可.
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过程中获取相关拖放文件即可,这些可能通过一些HTML5的教程可以得到帮助。
这时候只需要针对选择的文件构建相关FileInfo对象,并调用上传方法即可.
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); } } }
通过UploadProcess事件对上传文件进度信息进行一个设置更新
function onUploadProcess(file) { $('#p_' + file.ID).progressbar({ value: (file.PageIndex / file.Pages) * 100, text: file.FileName + '[' + file.UploadBytes + '/' + file.Size + ']' }); }
C#服务端
借助于Beetle对websocket的支持对应服务端的实现就非常简单了
////// Copyright © henryfan 2012 ///CreateTime: 2012/12/14 21:13:34 /// 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"; } }
服务端方法有两个一个是上传文件请求,和一个上传文件块接收方法.
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