ASP.NET CORE使用WebUploader对大文件分片上传,并通过ASP.NET CORE SignalR实时反馈后台处理进度给前端展示

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://www.cnblogs.com/wdw984/p/14645614.html

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     /// <summary>
 6     /// 上传文件配置类
 7     /// </summary>
 8     [Serializable]
 9     public class FileUploadConfig
10     {
11         /// <summary>
12         /// 临时文件夹目录名
13         /// </summary>
14         public string TempPath { get; set; }
15         /// <summary>
16         /// 上传文件保存目录名
17         /// </summary>
18         public string FileDir { get; set; }
19         /// <summary>
20         /// 允许上传的文件扩展名
21         /// </summary>
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     /// <summary>
 4     /// 文件秒传检测前台传递参数
 5     /// </summary>
 6     public class UploadFileWholeModel
 7     {
 8         /// <summary>
 9         /// 请求类型,这里固定为:whole
10         /// </summary>
11         public string CheckType { get; set; }
12         /// <summary>
13         /// 文件的MD5
14         /// </summary>
15         public string FileMd5 { get; set; }
16         /// <summary>
17         /// 前台文件的唯一标识
18         /// </summary>
19         public string FileGuid { get; set; }
20         /// <summary>
21         /// 前台上传文件名
22         /// </summary>
23         public string FileName { get; set; }
24         /// <summary>
25         /// 文件大小
26         /// </summary>
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     /// <summary>
 4     /// 文件分块(续传)传递参数
 5     /// </summary>
 6     public class UploadFileChunkModel
 7     {
 8         /// <summary>
 9         /// 文件分块传输检测类型,这里固定为chunk
10         /// </summary>
11         public string CheckType { get; set; }
12         /// <summary>
13         /// 文件的总大小
14         /// </summary>
15         public long? FileSize { get; set; }
16         /// <summary>
17         /// 当前块所属文件编号
18         /// </summary>
19         public string FileId { get; set; }
20         /// <summary>
21         /// 当前块基于文件的开始偏移量
22         /// </summary>
23         public long? ChunkStart { get; set; }
24         /// <summary>
25         /// 当前块基于文件的结束偏移量
26         /// </summary>
27         public long? ChunkEnd { get; set; }
28         /// <summary>
29         /// 当前块的大小
30         /// </summary>
31         public long? ChunkSize { get; set; }
32         /// <summary>
33         /// 当前块编号
34         /// </summary>
35         public string ChunkIndex { get; set; }
36         /// <summary>
37         /// 当前文件分块总数
38         /// </summary>
39         public string ChunkCount { get; set; }
40         /// <summary>
41         /// 当前块的编号
42         /// </summary>
43         public string ChunkId { get; set; }
44         /// <summary>
45         /// 当前块的md5
46         /// </summary>
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     /// <summary>
 6     /// 上传文件时的附加信息
 7     /// </summary>
 8     [Serializable]
 9     public class FormData
10     {
11         /// <summary>
12         /// 当前请求类型 分片传输是:chunk
13         /// </summary>
14         public string Checktype { get; set; }
15         /// <summary>
16         /// 文件总字节数
17         /// </summary>
18         public int? Filesize { get; set; }
19         /// <summary>
20         /// 文件唯一编号
21         /// </summary>
22         public string Fileid { get; set; }
23         /// <summary>
24         /// 分片数据大小
25         /// </summary>
26         public int? Chunksize { get; set; }
27         /// <summary>
28         /// 当前分片编号
29         /// </summary>
30         public int? Chunkindex { get; set; }
31         /// <summary>
32         /// 分片起始编译量
33         /// </summary>
34         public int? Chunkstart { get; set; }
35         /// <summary>
36         /// 分片结束编译量
37         /// </summary>
38         public int? Chunkend { get; set; }
39         /// <summary>
40         /// 分片总数量
41         /// </summary>
42         public int? Chunkcount { get; set; }
43         /// <summary>
44         /// 当前分片唯一编号
45         /// </summary>
46         public string Chunkid { get; set; }
47         /// <summary>
48         /// 当前块MD5值
49         /// </summary>
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     /// <summary>
 7     /// WebUploader上传文件实体类
 8     /// </summary>
 9     [Serializable]
10     public class UploadFileModel
11     {
12         /// <summary>
13         /// 前台WebUploader的ID
14         /// </summary>
15         public string Id { get; set; }
16         /// <summary>
17         /// 当前文件(块)的前端计算的md5
18         /// </summary>
19         public string FileMd5 { get; set; }
20         /// <summary>
21         /// 当前文件块号
22         /// </summary>
23         public string Chunk { get; set; }
24         /// <summary>
25         /// 原始文件名
26         /// </summary>
27         public string Name { get; set; }
28         /// <summary>
29         /// 文件类型(如:image/png)
30         /// </summary>
31         [FromForm(Name = "type")]
32         public string FileType { get; set; }
33         /// <summary>
34         /// 当前文件(块)的大小
35         /// </summary>
36         public long? Size { get; set; }
37         /// <summary>
38         /// 前台给此文件分配的唯一编号
39         /// </summary>
40         public string Guid { get; set; }
41         /// <summary>
42         /// 附件信息
43         /// </summary>
44         public FormData FromData { get; set; }
45         /// <summary>
46         /// Post过来的数据容器
47         /// </summary>
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     /// <summary>
 4     /// 文件合并请求参数类
 5     /// </summary>
 6     public class UploadFileMergeModel
 7     {
 8         /// <summary>
 9         /// 请求类型
10         /// </summary>
11         public string CheckType { get; set; }
12         /// <summary>
13         /// 前台检测到的文件大小
14         /// </summary>
15         public long? FileSize { get; set; }
16         /// <summary>
17         /// 前台返回文件总块数
18         /// </summary>
19         public int? ChunkNumber { get; set; }
20         /// <summary>
21         /// 前台返回文件的md5值
22         /// </summary>
23         public string FileMd5 { get; set; }
24         /// <summary>
25         /// 前台返回上传文件唯一标识
26         /// </summary>
27         public string FileName { get; set; }
28         /// <summary>
29         /// 文件扩展名,不包含.
30         /// </summary>
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         /// <summary>
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         /// </summary>
20         public readonly Lazy<ConcurrentDictionary<string, string>> ServerUploadFileList;
21         /// <summary>
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md5
23         /// </summary>
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
    {
        /// <summary>
        /// 客户端接收数据触发函数名
        /// </summary>
        /// <param name="clientMessageModel">消息实体类</param>
        /// <returns></returns>
        Task ReceiveMessage(ClientMessageModel clientMessageModel);
        /// <summary>
        /// Echart接收数据触发函数名
        /// </summary>
        /// <param name="data">JSON格式的可以被Echarts识别的data数据</param>
        /// <returns></returns>
        Task EchartsMessage(Array data);
        /// <summary>
        /// 客户端获取自己登录后的UID
        /// </summary>
        /// <param name="clientMessageModel">消息实体类</param>
        /// <returns></returns>
        Task GetMyId(ClientMessageModel clientMessageModel);
        /// <summary>
        /// 上传成功后服务器处理数据时通知前台的信息内容
        /// </summary>
        /// <param name="clientMessageModel">消息实体类</param>
        /// <returns></returns>
        Task UploadInfoMessage(ClientMessageModel clientMessageModel);
    }

扩展一下Class/ClientMessageModel.cs

    /// <summary>
    /// 服务端发送给客户端的信息
    /// </summary>
    [Serializable]
    public class ClientMessageModel
    {
        /// <summary>
        /// 接收用户编号
        /// </summary>
        public string UserId { get; set; }
        /// <summary>
        /// 组编号
        /// </summary>
        public string GroupName { get; set; }
        /// <summary>
        /// 发送的内容
        /// </summary>
        public string Context { get; set; }
        /// <summary>
        /// 自定义的响应编码
        /// </summary>
        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<UploadFileList>();//服务器上传的文件信息保存在内存中
            services.AddOptions()
                .Configure<FileUploadConfig>(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":
        $('.modal-body').append($("<p>" + data.context + "</p>"));//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
        $(".modal-content").append($("<div class=\"modal-footer\"><button type=\"button\" class=\"btn btn-secondary\" data-dismiss=\"modal\">Close</button></div>"));
        break;
    case "300":
    case "500":
        $('.modal-body').append($("<p>" + data.context + "</p>"));//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
            $('.modal-body').append($("<p id='process'>" + data.context + "</p>"));
        }
        $('#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.Title</title>
    @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> _fileUploadConfig;
 24         private readonly IOptionsSnapshot<UploadFileList> _fileList;
 25         private readonly string[] _fileExt;
 26         private readonly IHubContext<ChatHub, IChatClient> _hubContext;
 27         public IndexModel(IOptionsSnapshot<FileUploadConfig> fileUploadConfig, IOptionsSnapshot<UploadFileList> fileList, IHubContext<ChatHub, IChatClient> 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         /// <summary>
 43         /// 上传文件
 44         /// </summary>
 45         /// <returns></returns>
 46         public async Task<JsonResult> 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>(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 #endif
102             }
103             else
104             {
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             try
116             {
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 DEBUG
132                 Debug.WriteLine($"White Error:{e}");
133 #endif
134                 _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         #endregion
140 
141         #region 合并上传文件
142 
143         /// <summary>
144         /// 合并分片上传的文件
145         /// </summary>
146         /// <param name="mergeModel">前台传递的请求合并的参数</param>
147         /// <returns></returns>
148         public async Task<JsonResult> 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                 else
201                 {
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         #endregion
210 
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         #endregion
233 
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         #endregion
254 
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 FastZip
268                 {
269                     Password = "123456",
270                     CreateEmptyDirectories = true
271                 };
272                 try
273                 {
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 DEBUG
281                     Debug.WriteLine("开始解压缩文件。。。");
282 #endif
283                     fastZip.ExtractZip(zipFile, zipExtDir, "");
284 #if DEBUG
285                     Debug.WriteLine("解压缩文件成功。。。");
286 #endif
287                     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/length
296                         await SentMessage(user, $"校验进度==>{i1}/{zipFiles.Length}", "400");
297 #if DEBUG
298                         Debug.WriteLine($"当前进度:{i1},总数:{zipFiles.Length}");
299 #endif
300                     }
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, $"解压缩文件失败:{exception}", "500");
307 #if DEBUG
308                     Debug.WriteLine($"解压缩文件失败:{exception}");
309 #endif
310                 }
311             }, TaskCreationOptions.LongRunning);
312         }
313 
314         #endregion
315 
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 ClientMessageModel
322             {
323                 UserId = user,
324                 GroupName = "upload",
325                 Context = content,
326                 Code = code
327             });
328         }
329 
330         #endregion
331     }
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)

参考文章:

https://www.cnblogs.com/wdw984/p/11725118.html

http://fex.baidu.com/webuploader/

 

如此文章对你有帮助,请点个推荐吧。谢谢!

posted @ 2021-04-26 00:33  踏平扶桑  阅读(1072)  评论(2编辑  收藏  举报