本次，我们来实现一个单个大文件上传，并且把后台对上传文件的处理进度通过ASP.NET CORE SignalR反馈给前端展示，比如上传一个大的zip压缩包文件，后台进行解压缩，并且对压缩包中的文件进行md5校验，同时要求前台可以实时（实际情况看网络情况）展示后台对压缩包的处理进度（解压、校验文件）。
在前端上传文件的组件选择上，采用了WebUploader(http://fex.baidu.com/webuploader/)这个优秀的前端组件，下面是来自它的官网介绍：
WebUploader是由Baidu WebFE(FEX)团队开发的一个简单的以HTML5为主，FLASH为辅的现代文件上传组件。在现代的浏览器里面能充分发挥HTML5的优势，同时又不摒弃主流IE浏览器，沿用原来的FLASH运行时，兼容IE6+，iOS 6+, android 4+。两套运行时，同样的调用方式，可供用户任意选用。
采用大文件分片并发上传，极大的提高了文件上传效率。
WebUploader的功能很多，本次只使用它的上传前文件MD5校验、并发分片上传、分片MD5校验三个主要功能，分别来实现类似网盘中的文件【秒传】，浏览器多线程上传文件和文件的断点续传。
阅读参考此文章前，请先看一下https://blog.51cto.com/u_15127517/3321823
此文章是上一篇的功能扩展，一些基本的程序模块逻辑都已经在上一篇文章中做了介绍，这里就不再重复。
在正式使用WebUploader进行上传文件之前，先对它的执行流程和触发的事件做个大致的介绍（如有不对的地方请指正），我们可以通过它触发的事件来做相应的流程或业务上的预处理，比如文件秒传，重复文件检测等。
当WebUploader正确加载完成后，会触发它的ready事件；
当点击文件选择框的时候（其它方式传入文件所触发的事件请参考官方文档），会触发它的dialogOpen事件；
当选择文件完成后，触发事件的流程为：beforeFileQueued ==> fileQueued ==> filesQueued；
当点击（开始）上传的时候，触发事件的流程为：
1、正常文件上传流程
startUpload(如秒传（后台通过文件的md5判断返回）秒传则触发UploadSkip) ==> uploadStart ==> uploadBeforeSend ==> uploadProgress ==> uploadAccept(接收服务器处理分块传输后的返回信息) ==> uploadSuccess ==> uploadComplete ==> uploadFinished
2、文件秒传或续传流程
startUpload ==> uploadStart（触发秒传或文件续传） ==> uploadSkip ==> uploadSuccess ==> uploadComplete ==> uploadFinished
现在，我们在上一次项目的基础上做一些改造升级，最终实现我们本次的功能。
先看效果（GIF录制时间略长，请耐心等待一下）
首先，我们引用大名鼎鼎的WebUploader组件库。在项目上右键==>添加==>客户端库 的界面中选择unpkg然后输入webuploader
为了实现压缩文件的解压缩操作，我们在Nuget中引用SharpZipLib组件
然后我们在appsettings.json中增加一个配置用来保存上传文件。
1 { 2 "Logging": { 3 "LogLevel": { 4 "Default": "Information", 5 "Microsoft": "Warning", 6 "Microsoft.Hosting.Lifetime": "Information" 7 } 8 }, 9 "FileUpload": {10 "TempPath": "temp",//临时文件保存目录11 "FileDir": "upload",//上传完成后的保存目录12 "FileExt": "zip,rar"//允许上传的文件类型13 },14 "AllowedHosts": "*"15 }
在项目中新建一个Model目录，用来实现上传文件的相关配置，建立相应的多个类文件
FileUploadConfig.cs 服务器用来接受和保存文件的配置
1 using System; 2 3 namespace signalr.Model 4 { 5 /// 6 /// 上传文件配置类 7 /// 8 [Serializable] 9 public class FileUploadConfig10 {11 /// 12 /// 临时文件夹目录名13 /// 14 public string TempPath { get; set; }15 /// 16 /// 上传文件保存目录名17 /// 18 public string FileDir { get; set; }19 /// 20 /// 允许上传的文件扩展名21 /// 22 public string FileExt { get; set; }23 }24 }
UploadFileWholeModel.cs 前台开始传输前会对文件进行一次MD5算法，这里可以通过文件MD5值传递给后台来通过比对已上传的文件MD5值列表来实现秒传功能
1 namespace signalr.Model 2 { 3 /// 4 /// 文件秒传检测前台传递参数 5 /// 6 public class UploadFileWholeModel 7 { 8 /// 9 /// 请求类型，这里固定为：whole10 /// 11 public string CheckType { get; set; }12 /// 13 /// 文件的MD514 /// 15 public string FileMd5 { get; set; }16 /// 17 /// 前台文件的唯一标识18 /// 19 public string FileGuid { get; set; }20 /// 21 /// 前台上传文件名22 /// 23 public string FileName { get; set; }24 /// 25 /// 文件大小26 /// 27 public int? FileSize { get; set; }28 }29 }
UploadFileChunkModel.cs 前台文件分块传输的时候会对分块传输内容进行MD5计算，并且分块传输的时候会传递当前分块的一些信息，这里对应的后台接收实体类。
我们可以通过分块传输的MD5值来实现文件续传功能（如文件的某块MD5已存在则返回给前台跳过当前块）
1 namespace signalr.Model 2 { 3 /// 4 /// 文件分块（续传）传递参数 5 /// 6 public class UploadFileChunkModel 7 { 8 /// 9 /// 文件分块传输检测类型，这里固定为chunk10 /// 11 public string CheckType { get; set; }12 /// 13 /// 文件的总大小14 /// 15 public long? FileSize { get; set; }16 /// 17 /// 当前块所属文件编号18 /// 19 public string FileId { get; set; }20 /// 21 /// 当前块基于文件的开始偏移量22 /// 23 public long? ChunkStart { get; set; }24 /// 25 /// 当前块基于文件的结束偏移量26 /// 27 public long? ChunkEnd { get; set; }28 /// 29 /// 当前块的大小30 /// 31 public long? ChunkSize { get; set; }32 /// 33 /// 当前块编号34 /// 35 public string ChunkIndex { get; set; }36 /// 37 /// 当前文件分块总数38 /// 39 public string ChunkCount { get; set; }40 /// 41 /// 当前块的编号42 /// 43 public string ChunkId { get; set; }44 /// 45 /// 当前块的md546 /// 47 public string Md5 { get; set; }48 }49 }
FormData.cs 这是分块传输时传递的当前块的信息配置
1 using System; 2 3 namespace signalr.Model 4 { 5 /// 6 /// 上传文件时的附加信息 7 /// 8 [Serializable] 9 public class FormData10 {11 /// 12 /// 当前请求类型 分片传输是：chunk13 /// 14 public string Checktype { get; set; }15 /// 16 /// 文件总字节数17 /// 18 public int? Filesize { get; set; }19 /// 20 /// 文件唯一编号21 /// 22 public string Fileid { get; set; }23 /// 24 /// 分片数据大小25 /// 26 public int? Chunksize { get; set; }27 /// 28 /// 当前分片编号29 /// 30 public int? Chunkindex { get; set; }31 /// 32 /// 分片起始编译量33 /// 34 public int? Chunkstart { get; set; }35 /// 36 /// 分片结束编译量37 /// 38 public int? Chunkend { get; set; }39 /// 40 /// 分片总数量41 /// 42 public int? Chunkcount { get; set; }43 /// 44 /// 当前分片唯一编号45 /// 46 public string Chunkid { get; set; }47 /// 48 /// 当前块MD5值49 /// 50 public string Md5 { get; set; }51 }52 }
UploadFileModel.cs 每次上传文件的时候，前台都会传递这些参数给服务器，服务器可以根据参数做相应的处理
1 using System; 2 using Microsoft.AspNetCore.Mvc; 3 4 namespace signalr.Model 5 { 6 /// 7 /// WebUploader上传文件实体类 8 /// 9 [Serializable]10 public class UploadFileModel11 {12 /// 13 /// 前台WebUploader的ID14 /// 15 public string Id { get; set; }16 /// 17 /// 当前文件（块）的前端计算的md518 /// 19 public string FileMd5 { get; set; }20 /// 21 /// 当前文件块号22 /// 23 public string Chunk { get; set; }24 /// 25 /// 原始文件名26 /// 27 public string Name { get; set; }28 /// 29 /// 文件类型（如：image/png）30 /// 31 [FromForm(Name = "type")]32 public string FileType { get; set; }33 /// 34 /// 当前文件（块）的大小35 /// 36 public long? Size { get; set; }37 /// 38 /// 前台给此文件分配的唯一编号39 /// 40 public string Guid { get; set; }41 /// 42 /// 附件信息43 /// 44 public FormData FromData { get; set; }45 /// 46 /// Post过来的数据容器47 /// 48 public byte[] FileData { get; set; }49 }50 }
UploadFileMergeModel.cs 当所有块传输完成后，传递给后台一个合并文件的请求，后台通过参数中的信息把分块保存的文件合并成一个完整的文件
1 namespace signalr.Model 2 { 3 /// 4 /// 文件合并请求参数类 5 /// 6 public class UploadFileMergeModel 7 { 8 /// 9 /// 请求类型10 /// 11 public string CheckType { get; set; }12 /// 13 /// 前台检测到的文件大小14 /// 15 public long? FileSize { get; set; }16 /// 17 /// 前台返回文件总块数18 /// 19 public int? ChunkNumber { get; set; }20 /// 21 /// 前台返回文件的md5值22 /// 23 public string FileMd5 { get; set; }24 /// 25 /// 前台返回上传文件唯一标识26 /// 27 public string FileName { get; set; }28 /// 29 /// 文件扩展名，不包含.30 /// 31 public string FileExt { get; set; }32 }33 }
为了实现【秒传】和分块传输时的【断点续传】功能，我们在Class目录中定义一个UploadFileList.cs类，用来模拟持久化保存服务器所接收到的文件MD5校验列表和已接收的分块MD5值信息，这里我们使用了并发线程安全的ConcurrentDictionary和ConcurrentBag
1 using System; 2 using System.Collections.Concurrent; 3 4 namespace signalr.Class 5 { 6 public class UploadFileList 7 { 8 private static readonly Lazy<ConcurrentDictionary<string, string>> _serverUploadFileList = new Lazy<ConcurrentDictionary<string, string>>(); 9 private static readonly Lazy<ConcurrentDictionary<string, ConcurrentBag<string>>> _uploadChunkFileList =10 new Lazy<ConcurrentDictionary<string, ConcurrentBag<string>>>();11 public UploadFileList()12 {13 ServerUploadFileList = _serverUploadFileList;14 UploadChunkFileList = _uploadChunkFileList;15 }16 17 /// 18 /// 服务器上已经存在的文件，key为文件的Md5,value为文件路径19 /// 20 public readonly Lazy<ConcurrentDictionary<string, string>> ServerUploadFileList;21 /// 22 /// 客户端分配上传文件时的记录信息，key为上传文件的唯一id，value为文件分片后的当前段的md523 /// 24 public readonly Lazy<ConcurrentDictionary<string, ConcurrentBag<string>>> UploadChunkFileList;25 }26 }
扩展一下HubInterface/IChatClient.cs 用来推送给前台展示后台处理的信息
public interface IChatClient
{ ///
/// 客户端接收数据触发函数名 ///
/// 消息实体类
/// Task ReceiveMessage(ClientMessageModel clientMessageModel); ///
/// Echart接收数据触发函数名 ///
/// JSON格式的可以被Echarts识别的data数据
/// Task EchartsMessage(Array data); ///
/// 客户端获取自己登录后的UID ///
/// 消息实体类
/// Task GetMyId(ClientMessageModel clientMessageModel); ///
/// 上传成功后服务器处理数据时通知前台的信息内容 ///
/// 消息实体类
/// Task UploadInfoMessage(ClientMessageModel clientMessageModel);
}
扩展一下Class/ClientMessageModel.cs
///
/// 服务端发送给客户端的信息 /// [Serializable] public class ClientMessageModel
{ ///
/// 接收用户编号 ///
public string UserId { get; set; } ///
/// 组编号 ///
public string GroupName { get; set; } ///
/// 发送的内容 ///
public string Context { get; set; } ///
/// 自定义的响应编码 ///
public string Code { get; set; }
}
我们在Startup.cs中注入上传文件的配置，同时把前文的XSRF防护去掉，我们在前台请求的时候带上防护认证信息。
public void ConfigureServices(IServiceCollection services)
{
services.AddSignalR();
services.AddRazorPages()
services.AddSingleton();//服务器上传的文件信息保存在内存中 services.AddOptions()
.Configure(Configuration.GetSection("FileUpload"));//服务器上传文件配置
}
在项目的wwwroot/js下新建一个uploader.js
"use strict";var connection = new signalR.HubConnectionBuilder()
.withUrl("/chatHub")
.withAutomaticReconnect()
.configureLogging(signalR.LogLevel.Debug)
.build();var user = "";
connection.on("GetMyId", function (data) {
user = data.userId;
});
connection.on("ReceiveMessage", function (data) {
console.log(data.userId + data.context);
});
connection.on("UploadInfoMessage", function (data) { switch (data.code) { case "200":
$('.modal-body').append($("" + data.context + ""));//当后台返回处理完成或出错时，前台显示内容，同时显示关闭按钮
$(".modal-content").append($("Close")); break; case "300": case "500":
$('.modal-body').append($("" + data.context + ""));//展示后台返回信息 break; case "400": if ($("#process").length == 0) {//展示后台推送的文件处理进度
$('.modal-body').append($("" + data.context + ""));
}
$('#process').text(data.context); break;
}
});
connection.start().then(function () {
console.log("服务器已连接");
}).catch(function (err) { return console.error(err.toString());
});
在项目的Pages/Shared中新建一个Razor布局页_LayoutUpload.cshtml
<!DOCTYPE html><html><head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width" />
<link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="~/lib/webuploader/dist/webuploader.css" />
<script type="text/javascript" src="~/lib/jquery/dist/jquery.min.js">script>
<script type="text/javascript" src="~/lib/webuploader/dist/webuploader.js">script>
<script type="text/javascript" src="~/lib/bootstrap/dist/js/bootstrap.min.js">script>
<title>@ViewBag.Titletitle>
@await RenderSectionAsync("Scripts", required: false)head><body>@RenderBody()body>html>
在Pages目录下新建一个upload目录，然后在它下面新建一个index.cshtml，这个文件中实现了Webuploader中我们所要使用的事件监测、文件上传功能。
1 @page "{handler?}" 2 @model MediatRStudy.Pages.upload.IndexModel 3 @{ 4 ViewBag.Title = "WebUploader"; 5 Layout = "_LayoutUpload"; 6 } 7 @section Scripts 8 { 9 <script src="~/js/signalr/dist/browser/signalr.js">script> 10 <script src="~/js/uploader.js">script> 11 12 <script> 13 // 每次分片文件大小限制为5M 14 var chunkSize = 5 * 1024 * 1024; 15 // 全部文件限制10G大小 16 var fileTotalSize = 10 * 1024 * 1024 * 1024; 17 // 单文件限制5G大小 18 var fileSingleSize = 5 * 1024 * 1024 * 1024; 19 jQuery(function() { 20 var $ = jQuery, 21 $list = $('#thelist'), 22 $btn = $('#ctlBtn'), 23 state = 'pending', 24 md5s = {},//分块传输时的各个块的md5值 25 dataState,//当前状态 26 Token,//可以做用户验证 27 uploader;//webUploader的实例 28 var fileExt = ["zip", "rar"];//允许上传的类型 29 Token = '@ViewData["Token"]'; 30 if (Token == '' || Token == 'undefined') { 31 $("#uploader").hide(); 32 alert("登录超时，请重新登录。"); 33 } 34 35 36 37 38 //注册Webuploader要监听的上传文件时的三个事件 39 //before-send-file 在执行文件上传前先执行这个；before-send在开始往服务器发送文件前执行；after-send-file所有文件上传完毕后执行 40 41 window.WebUploader.Uploader.register({ 42 "before-send-file": "beforeSendFile", 43 "before-send": "beforeSend", 44 "after-send-file": "afterSendFile" 45 }, 46 { 47 //第一步，开始上传前校验文件，并传递给服务器当前文件的MD5，服务器可根据MD5来实现类似秒传效果 48 beforeSendFile: function(file) { 49 var owner = this.owner; 50 md5s.length = 0; 51 var deferred = window.WebUploader.Deferred(); 52 owner.md5File(file, 0, file.size) 53 .progress(function(percentage) { 54 console.log("文件MD5计算进度：", percentage); 55 }) 56 .fail(function() { 57 deferred.reject(); 58 console.log("文件MD5获取失败"); 59 }) 60 .then(function(md5) { 61 console.log("文件MD5：", md5); 62 file.md5 = md5; 63 var params = { 64 "checktype": "whole", 65 "filesize": file.size, 66 "filemd5": md5 67 ,"filename":file.name 68 ,"fileguid":file.guid 69 }; 70 $.ajax({ 71 url: '/upload/FileWhole', //通过md5校验实现文件秒传 72 type: 'POST', 73 headers: {//请求的时候传递进去防CSRF攻击的认证信息 74 RequestVerificationToken: 75 $('input:hidden[name="__RequestVerificationToken"]').val() 76 }, 77 data: params, 78 contentType: 'application/x-www-form-urlencoded', 79 async: true, // 开启异步请求 80 dataType: 'JSON', 81 success: function(data) { 82 data = (typeof data) == 'string' ? JSON.parse(data) : data; 83 if (data.code != '200') { 84 dataState = data; 85 //服务器返回错误信息 86 alert('错误：' + data.msg); 87 deferred.reject();//取消后续上传 88 } 89 if (data.isExist) { 90 // 跳过当前文件并标记文件状态为上传完成 91 dataState = data; 92 owner.skipFile(file, window.WebUploader.File.Status.COMPLETE); 93 deferred.resolve(); 94 $('#' + file.id).find('p.state').text('上传成功【秒传】'); 95 96 } else { 97 deferred.resolve(); 98 } 99 },100 error: function(xhr, status) {101 $('#' + file.id).find('p.state').text('上传失败：'+status);102 console.log("上传失败：", status);103 }104 });105 });106 107 return deferred.promise();108 },109 //上传事件第二步：分块上传时，每个分块触发上传前执行110 beforeSend: function(block) {111 var deferred = window.WebUploader.Deferred();112 var owner = this.owner;113 owner.md5File(block.file, block.start, block.end)114 .progress(function(percentage) {115 console.log("当前分块内容的MD5计算进度：", percentage);116 })117 .fail(function() {118 deferred.reject();119 })120 .then(function(md5) {121 //计算当前块的MD5值并写入数组122 md5s[block.blob.uid] = md5;123 deferred.resolve();124 });125 return deferred.promise();126 },127 //时间点3：所有分块上传成功后调用此函数128 afterSendFile: function(file) {129 var deferred = $.Deferred();130 $('#' + file.id).find('p.state').text('执行最后一步');131 console.log(file);132 if (file.skipped) {133 deferred.resolve();134 console.log("执行服务器合并分块文件操作");135 return deferred.promise();136 }137 var chunkNumber = Math.ceil(file.size / chunkSize);//总块数138 var params = {139 "checktype": "merge",140 "filesize": file.size,141 "chunknumber": chunkNumber,142 "filemd5": file.md5,143 "filename": file.guid,144 "fileext": file.ext//扩展名145 };146 $.ajax({147 type: "POST",148 url: "/upload/FileMerge",149 headers: {150 RequestVerificationToken:151 $('input:hidden[name="__RequestVerificationToken"]').val(),152 userid:user //传递SignalR分配的编号153 },154 data: params,155 async: true,156 success: function(response) {157 if (response.code == 200) {158 //服务器合并完成分块传输的文件后执行159 dataState = response;160 $("#myModal").modal('show');161 } else {162 alert(response.msg);163 }164 deferred.resolve();165 },166 error: function() {167 dataState = undefined;168 deferred.reject();169 }170 });171 return deferred.promise();172 }173 });174 uploader = window.WebUploader.create({175 resize: false,176 fileNumLimit: 1,177 swf: '/lib/webuploader/dist/Uploader.swf',178 server: '/upload/FileSave',179 pick: { id: '#picker', multiple: false },180 chunked: true,181 chunkSize: chunkSize,182 chunkRetry: 3,183 fileSizeLimit: fileTotalSize,184 fileSingleSizeLimit: fileSingleSize,185 formData: {186 }187 });188 uploader.on('beforeFileQueued',189 function(file) {190 var isAdd = false;191 for (var i = 0; i < fileExt.length; i++) {192 if (file.ext == fileExt[i]) {193 file.guid = window.WebUploader.Base.guid();194 isAdd = true;195 break;196 }197 }198 return isAdd;199 });200 //每次上传前，如果分块传输，则带上分块信息参数201 uploader.on('uploadBeforeSend',202 function(block, data, headers) {203 var params = {204 "checktype": "chunk",205 "filesize": block.file.size,206 "fileid": block.blob.ruid,207 "chunksize": block.blob.size,208 "chunkindex": block.chunk,209 "chunkstart": block.start,210 "chunkend": block.end,211 "chunkcount": block.chunks,212 "chunkid": block.blob.uid,213 "md5": md5s[block.blob.uid]214 };215 data.formData = JSON.stringify(params);216 217 headers.Authorization = Token;218 headers.RequestVerificationToken = $('input:hidden[name="__RequestVerificationToken"]').val();219 data.guid = block.file.guid;220 });221 // 当有文件添加进来的时候222 uploader.on('fileQueued',223 function(file) {224 $list.append('<div id="' +225 file.id +226 '" class="item">' +227 '<h4 class="info">' +228 file.name +229 'h4>' +230 '<input type="hidden" id="h_' +231 file.id +232 '" value="' +233 file.guid +234 '" />' +235 '<p class="state">等待上传...p>' +236 'div>');237 });238 239 // 文件上传过程中创建进度条实时显示。240 uploader.on('uploadProgress',241 function(file, percentage) {242 var $li = $('#' + file.id),243 $percent = $li.find('.progress .progress-bar');244 // 避免重复创建245 if (!$percent.length) {246 $percent = $('<div class="progress progress-striped active">' +247 '<div class="progress-bar" role="progressbar" style="width: 0%">' +248 'div>' +249 'div>').appendTo($li).find('.progress-bar');250 }251 $li.find('p.state').text('上传中');252 253 $percent.css('width', percentage * 100 + '%');254 });255 256 uploader.on('uploadSuccess',257 function(file) {258 if (dataState == undefined) {259 $('#' + file.id).find('p.state').text('上传失败');260 $('#' + file.id).find('button').remove();261 $('#' + file.id).find('p.state').before('<button id="retry" type="button" class="btn btn-primary fright retry pbtn">重新上传button>');262 file.setStatus('error');263 return;264 }265 if (dataState.success == true) {266 if (dataState.miaochuan == true) {267 $('#' + file.id).find('p.state').text('上传成功[秒传]');268 } else {269 $('#' + file.id).find('p.state').text('上传成功');270 }271 $('#' + file.id).find('button').remove();272 return;273 274 } else {275 $('#' + file.id).find('p.state').text('服务器未能成功接收，状态：' + dataState.success);276 return;277 }278 });279 280 uploader.on('uploadError',281 function(file) {282 $('#' + file.id).find('p.state').text('上传出错');283 });284 //分块传输后，可以在这个事件中获取到服务器返回的信息，同时这里可以实现文件续传（块文件的MD5存在时，后台可以跳过保存步骤）285 uploader.on('uploadAccept',286 function(file, response, reject) {287 if (response.code !== 200) {288 alert("上传出错：" + response.msg);289 return false;290 }291 return true;292 });293 uploader.on('uploadComplete',294 function(file) {295 $('#' + file.id).find('.progress').fadeOut();296 });297 298 uploader.on('all',299 function(type) {300 if (type === 'startUpload') {301 state = 'uploading';302 } else if (type === 'stopUpload') {303 state = 'paused';304 } else if (type === 'uploadFinished') {305 state = 'done';306 }307 if (state === 'done') {308 $btn.text('继续上传');309 } else if (state === 'uploading') {310 $btn.text('暂停上传');311 } else {312 $btn.text('开始上传');313 }314 });315 $btn.on('click',316 function() {317 if (state === 'uploading') {318 uploader.stop();319 } else if (state == 'done') {320 window.location.reload();321 } else {322 uploader.upload();323 }324 });325 });326 script>327 }328 <div class="container">329 <div class="row">330 <div id="uploader" class="wu-example">331 <span style="color: red">请上传压缩包span>332 <div class="form-group" id="thelist">333 div>334 <div class="form-group">335 <form method="post">336 <div id="picker" class="webuploader-container">337 <div class="webuploader-pick">选择文件div>338 <div style="position: absolute; top: 0; left: 0; width: 88px; height: 34px; overflow: hidden; bottom: auto; right: auto;">339 <input type="file" name="file" class="webuploader-element-invisible" />340 <label style="-ms-opacity: 0; opacity: 0; width: 100%; height: 100%; display: block; cursor: pointer; background: rgb(255, 255, 255);">label>341 div>342 div>343 <button id="ctlBtn" class="btn btn-success" type="button">开始上传button>344 form>345 div>346 div>347 div>348 div>349 350 <div class="modal fade" id="myModal" tabindex="-1" aria-labelledby="exampleModalScrollableTitle" style="display: none;" data-backdrop="static" aria-hidden="true">351 <div class="modal-dialog modal-dialog-scrollable">352 <div class="modal-content">353 <div class="modal-header">354 <h5 class="modal-title" id="exampleModalScrollableTitle">正在处理。。。h5>355 <button type="button" class="close" data-dismiss="modal" aria-label="Close">356 357 button>358 div>359 <div class="modal-body">360 <p>服务器正在处理数据，请不要关闭和刷新此页面。p>361 div>362 div>363 div>364 div>
index.cshtml的代码文件如下
本示例只能解压缩zip文件，并且密码是123456，友情提示，不要用QQ浏览器调试，否则会遇到选择文件后DEBUG停止运行。
本示例只能解压缩zip文件，并且密码是123456，友情提示，不要用QQ浏览器调试，否则会遇到选择文件后DEBUG停止运行。
本示例只能解压缩zip文件，并且密码是123456，友情提示，不要用QQ浏览器调试，否则会遇到选择文件后DEBUG停止运行。
1 using ICSharpCode.SharpZipLib.Zip; 2 using Microsoft.AspNetCore.Http; 3 using Microsoft.AspNetCore.Mvc; 4 using Microsoft.AspNetCore.Mvc.RazorPages; 5 using Microsoft.AspNetCore.SignalR; 6 using Microsoft.Extensions.Options; 7 using signalr.Class; 8 using signalr.HubInterface; 9 using signalr.Hubs; 10 using signalr.Model; 11 using System; 12 using System.Collections.Concurrent; 13 using System.Diagnostics; 14 using System.IO; 15 using System.Linq; 16 using System.Text.Json; 17 using System.Threading.Tasks; 18 19 namespace signalr.Pages.upload 20 { 21 public class IndexModel : PageModel 22 { 23 private readonly IOptionsSnapshot _fileUploadConfig; 24 private readonly IOptionsSnapshot _fileList; 25 private readonly string[] _fileExt; 26 private readonly IHubContext _hubContext; 27 public IndexModel(IOptionsSnapshotfileUploadConfig, IOptionsSnapshotfileList, IHubContext hubContext) 28 { 29 _fileUploadConfig = fileUploadConfig; 30 _fileList = fileList; 31 _fileExt = _fileUploadConfig.Value.FileExt.Split(',').ToArray(); 32 _hubContext = hubContext; 33 } 34 public IActionResult OnGet() 35 { 36 ViewData["Token"] = "666"; 37 return Page(); 38 } 39 40 #region 上传文件 41 42 /// 43 /// 上传文件 44 /// 45 /// 46 public async Task OnPostFileSaveAsync(IFormFile file, UploadFileModel model) 47 { 48 if (_fileUploadConfig.Value == null) 49 { 50 return new JsonResult(new { code = 400, msg = "服务器配置不正确" }); 51 } 52 53 if (file == null || file.Length < 1) 54 { 55 return new JsonResult(new { code = 404, msg = "没有接收到要保存的文件" }); 56 } 57 Request.EnableBuffering(); 58 var formData = Request.Form["formData"]; 59 if (model == null || string.IsNullOrWhiteSpace(formData)) 60 { 61 return new JsonResult(new { code = 401, msg = "没有接收到必要的参数" }); 62 } 63 64 var request = model; 65 long.TryParse(Request.Form["size"], out var fileSize); 66 request.Size = fileSize; 67 try 68 { 69 request.FromData = JsonSerializer.Deserialize(formData, new JsonSerializerOptions { PropertyNameCaseInsensitive = true }); 70 } 71 catch (Exception e) 72 { 73 Debug.WriteLine(e); 74 } 75 76 if (request.FromData == null) 77 { 78 return new JsonResult(new { code = 402, msg = "参数错误" }); 79 } 80 81 #if DEBUG 82 Debug.WriteLine($"原文件名：{request.Name},文件编号：{request.Guid},文件块编号：{request.Chunk},文件Md5：{request.FileMd5},当前块UID：{request.FromData?.Chunkid},当前块MD5：{request.FromData?.Md5}"); 83 #endif 84 var fileExt = request.Name.Substring(request.Name.LastIndexOf('.') + 1).ToLowerInvariant(); 85 if (!_fileExt.Contains(fileExt)) 86 { 87 return new JsonResult(new { code = 403, msg = "文件类型不在允许范围内" }); 88 } 89 if (_fileList.Value.UploadChunkFileList.Value.ContainsKey(request.Guid)) 90 { 91 if (!_fileList.Value.UploadChunkFileList.Value[request.Guid].Any(x => string.Equals(x, request.FromData.Md5, StringComparison.OrdinalIgnoreCase))) 92 { 93 _fileList.Value.UploadChunkFileList.Value[request.Guid].Add(request.FromData.Md5); 94 } 95 #if DEBUG 96 else 97 { 98 Debug.WriteLine($"ContainsKey{request.FromData.Chunkindex}存在校验值{request.FromData.Md5}"); 99 return new JsonResult(new { code = 200, msg = "成功接收", miaochuan = true });100 }101 #endif102 }103 else104 {105 return new JsonResult(new { code = 405, msg = "接收失败,因为服务器没有找到此文件的容器,请重新上传" });106 }107 108 var dirPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _fileUploadConfig.Value.TempPath, request.Guid);109 if (!Directory.Exists(dirPath))110 {111 Directory.CreateDirectory(dirPath);112 }113 114 var tempFile = string.Concat(dirPath, "\\", request.FromData.Chunkindex.ToString().PadLeft(4, '0'), ".", fileExt);115 try116 {117 118 await using var fs = System.IO.File.OpenWrite(tempFile);119 request.FileData = new byte[Convert.ToInt32(request.FromData.Chunksize ?? 0)];120 121 await using var memStream = new MemoryStream();122 await file.CopyToAsync(memStream);123 124 request.FileData = memStream.ToArray();125 126 await fs.WriteAsync(request.FileData, 0, request.FileData.Length);127 await fs.FlushAsync();128 }129 catch (Exception e)130 {131 #if DEBUG132 Debug.WriteLine($"White Error:{e}");133 #endif134 _fileList.Value.UploadChunkFileList.Value.TryRemove(request.Guid, out _);135 }136 return new JsonResult(new { code = 200, msg = "成功接收", miaochuan = false });137 }138 139 #endregion140 141 #region 合并上传文件142 143 /// 144 /// 合并分片上传的文件145 /// 146 /// 前台传递的请求合并的参数147 /// 148 public async Task OnPostFileMergeAsync(UploadFileMergeModel mergeModel)149 {150 return await Task.Run(async () =>151 {152 if (mergeModel == null || string.IsNullOrWhiteSpace(mergeModel.FileName) ||153 string.IsNullOrWhiteSpace(mergeModel.FileMd5))154 {155 return new JsonResult(new { code = 300, success = false, count = 0, size = 0, msg = "合并失败，参数不正确。" });156 }157 if (!_fileExt.Contains(mergeModel.FileExt.ToLowerInvariant()))158 {159 return new JsonResult(new { code = 403, success = false, msg = "文件类型不在允许范围内" });160 }161 162 var fileSavePath = "";163 if (!_fileList.Value.ServerUploadFileList.Value.ContainsKey(mergeModel.FileMd5))164 {165 //合并块文件、删除临时文件166 var chunks = Directory.GetFiles(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _fileUploadConfig.Value.TempPath, mergeModel.FileName), "*.*");167 if (!chunks.Any())168 {169 return new JsonResult(new { code = 302, success = false, count = 0, size = 0, msg = "未找到文件块信息，请重试。" });170 }171 var dirPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _fileUploadConfig.Value.FileDir);172 if (!Directory.Exists(dirPath))173 {174 Directory.CreateDirectory(dirPath);175 }176 fileSavePath = Path.Combine(_fileUploadConfig.Value.FileDir,177 string.Concat(mergeModel.FileName, ".", mergeModel.FileExt));178 await using var fs =179 new FileStream(Path.Combine(dirPath, string.Concat(mergeModel.FileName, ".", mergeModel.FileExt)), FileMode.Create);180 foreach (var file in chunks.OrderBy(x => x))181 {182 //Debug.WriteLine($"File==>{file}");183 var bytes = await System.IO.File.ReadAllBytesAsync(file);184 await fs.WriteAsync(bytes.AsMemory(0, bytes.Length));185 }186 //Directory.Delete(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _fileUploadConfig.Value.TempPath, mergeModel.FileName), true);187 188 189 if (!_fileList.Value.ServerUploadFileList.Value.TryAdd(mergeModel.FileMd5, fileSavePath))190 {191 return new JsonResult(new { code = 301, success = false, count = 0, size = 0, msg = "服务器保存文件失败，请重试。" });192 }193 }194 var user = Request.Headers["userid"];195 //调用解压文件196 if (string.Equals(mergeModel.FileExt.ToLowerInvariant(), "zip"))197 {198 DoUnZip(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, fileSavePath), user.ToString());199 }200 else201 {202 await SentMessage(user.ToString(), "服务器只能解压缩zip格式文件。", "200");203 }204 return new JsonResult(new { code = 200, success = true, count = 0, size = 0, msg = "上传成功", url = fileSavePath });205 });206 207 }208 209 #endregion210 211 #region 文件秒传检测、文件类型允许范围检测212 public JsonResult OnPostFileWholeAsync(UploadFileWholeModel model)213 {214 if (model == null || string.IsNullOrWhiteSpace(model.FileMd5))215 {216 return new JsonResult(new { Code = 300, IsExist = false, success = false, FileUrl = "", Msg = "参数不正确" });217 }218 var fileExt = model.FileName.Substring(model.FileName.LastIndexOf('.') + 1).ToLowerInvariant();219 if (!_fileExt.Contains(fileExt))220 {221 return new JsonResult(new { code = 403, success = false, msg = "文件类型不在允许范围内" });222 }223 if (_fileList.Value.ServerUploadFileList.Value.ContainsKey(model.FileMd5))224 {225 return new JsonResult(new { Code = 200, IsExist = true, success = true, FileUrl = _fileList.Value.ServerUploadFileList.Value[model.FileMd5], miaochuan = true });226 }227 //检测的时候创建待上传文件的分块MD5容器228 _fileList.Value.UploadChunkFileList.Value.TryAdd(model.FileGuid, new ConcurrentBag<string>());229 230 return new JsonResult(new { Code = 200, IsExist = false, FileUrl = "" });231 }232 #endregion233 234 #region 文件块秒传检测235 public JsonResult OnPostFileChunkAsync(UploadFileChunkModel model)236 {237 if (model == null || string.IsNullOrWhiteSpace(model.Md5) || string.IsNullOrWhiteSpace(model.FileId))238 {239 return new JsonResult(new { Code = 300, IsExist = false, success = false, FileUrl = "", Msg = "参数不正确" });240 }241 242 if (!_fileList.Value.UploadChunkFileList.Value.ContainsKey(model.FileId))243 {244 return new JsonResult(new { Code = 200, IsExist = false, FileUrl = "" });245 }246 247 if (!_fileList.Value.UploadChunkFileList.Value[model.FileId].Contains(model.Md5))248 {249 return new JsonResult(new { Code = 200, IsExist = false, FileUrl = "" });250 }251 return new JsonResult(new { Code = 200, IsExist = true, success = true, miaochuan = true });252 }253 #endregion254 255 #region 解压、校验文件256 257 private void DoUnZip(string zipFile, string user)258 {259 Task.Factory.StartNew(async () =>260 {261 if (!System.IO.File.Exists(zipFile))262 {263 //发送一条文件不存在的消息264 await SentMessage(user, "访问上传的压缩包失败");265 return;266 }267 var fastZip = new FastZip268 {269 Password = "123456",270 CreateEmptyDirectories = true271 };272 try273 {274 var zipExtDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ZipEx", "601018");275 //删除现有文件夹276 if (Directory.Exists(zipExtDir))277 Directory.Delete(zipExtDir, true);278 //发送开始解压缩信息279 await SentMessage(user, "开始解压缩文件。。。");280 #if DEBUG281 Debug.WriteLine("开始解压缩文件。。。");282 #endif283 fastZip.ExtractZip(zipFile, zipExtDir, "");284 #if DEBUG285 Debug.WriteLine("解压缩文件成功。。。");286 #endif287 await SentMessage(user, "解压缩文件成功，开始校验。。。");288 //发送解压成功并开始校验文件信息289 var zipFiles = Directory.GetFiles(zipExtDir, "*.jpg", SearchOption.AllDirectories);290 for (var i = 0; i < zipFiles.Length; i++)291 {292 var file = zipFiles[i];293 var i1 = i + 1;294 await Task.Delay(100);//模拟文件处理需要100毫秒295 //发送进度 i/length296 await SentMessage(user, $"校验进度==>{i1}/{zipFiles.Length}", "400");297 #if DEBUG298 Debug.WriteLine($"当前进度:{i1},总数：{zipFiles.Length}");299 #endif300 }301 await SentMessage(user, "校验完成", "200");302 }303 catch (Exception exception)304 {305 //发送解压缩失败信息306 await SentMessage(user, $"解压缩文件失败:{exception}", "500");307 #if DEBUG308 Debug.WriteLine($"解压缩文件失败:{exception}");309 #endif310 }311 }, TaskCreationOptions.LongRunning);312 }313 314 #endregion315 316 #region 消息推送前台317 318 private async Task SentMessage(string user, string content, string code = "300")319 {320 321 await _hubContext.Clients.Client(user).UploadInfoMessage(new ClientMessageModel322 {323 UserId = user,324 GroupName = "upload",325 Context = content,326 Code = code327 });328 }329 330 #endregion331 }332 }
View Code
未能完善的地方：
1、上传几百兆或更大的文件，webuploader计算md5时间太长；
2、后台处理错误的时候，前台接收消息后没能出现关闭按钮；
3、分块传输时文件断点续传没有具体实现（理论上是没问题的）
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
