webuploader-异步切片上传(暂不支持断点续传)及 下载方法!C#/.NET

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进入正题:

关于webuploader,参考网址:https://fex.baidu.com/webuploader/

本篇博客范例下载地址:https://download.csdn.net/download/wolongbb/11958864

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。

作为一个上传插件,我们首先要做的是下载资源包,方便项目引用。

关于下载资源包,参考网址上有下载链接,可自行下载!

下面构造项目:

1、引入相关文件:

    <meta name="viewport" content="width=device-width" />
    <title>大文件上传测试</title>
    <script src="~/Scripts/jquery-1.8.2.min.js"></script>
    <link href="/Content/webuploader-0.1.5/webuploader.css" rel="stylesheet" />
    <script src="/Content/webuploader-0.1.5/webuploader.js"></script>

2、参数说明:

3、前端HTML如下:

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>大文件上传测试</title>
    <script src="~/Scripts/jquery-1.8.2.min.js"></script>
    <link href="/Content/webuploader-0.1.5/webuploader.css" rel="stylesheet" />
    <script src="/Content/webuploader-0.1.5/webuploader.js"></script>
    <script type="text/javascript">
    $(function () {
        var GUID = WebUploader.Base.guid();//一个GUID
        var uploader = WebUploader.create({
            // {Boolean} [可选] [默认值:false] 设置为 true 后,不需要手动调用上传,有文件选择即开始上传。
            auto: true,
            swf: '/Content/webuploader-0.1.5/Uploader.swf',
            server: '@Url.Action("Upload")',
            pick: '#picker',
            resize: false,
            chunked: true,//开始分片上传
            chunkSize: 2048000,//每一片的大小
            formData: {
                guid: GUID //自定义参数,待会儿解释
            }
        });
        uploader.on('fileQueued', function (file) {
            $("#uploader .filename").html("文件名:" + file.name);
            $("#uploader .state").html('等待上传');
        });
        uploader.on('uploadSuccess', function (file, response) {
            $.post('@Url.Action("Merge")', { guid: GUID, fileName: file.name }, function (data) {
                //alert("上传成功!")
            });
        });
        uploader.on('uploadProgress', function (file, percentage) {
            $("#uploader .progress-bar").width(percentage * 100 + '%');
            $(".sr-only").html('上传进度:'+(percentage * 100).toFixed(2) + '%')

        });
        uploader.on('uploadSuccess', function () {
            $("#uploader .progress-bar").removeClass('progress-bar-striped').removeClass('active').removeClass('progress-bar-info').addClass('progress-bar-success');
            $("#uploader .state").html("上传成功...");

        });
        uploader.on('uploadError', function () {
            $("#uploader .progress-bar").removeClass('progress-bar-striped').removeClass('active').removeClass('progress-bar-info').addClass('progress-bar-danger');
            $("#uploader .state").html("上传失败...");
        });

        $("#ctlBtn").click(function () {
            uploader.upload();
            $("#ctlBtn").text("上传");
            $('#ctlBtn').attr('disabled', 'disabled');
            $("#uploader .progress-bar").addClass('progress-bar-striped').addClass('active');
            $("#uploader .state").html("上传中...");
        });
        $('#pause').click(function () {
            uploader.stop(true);
            $('#ctlBtn').removeAttr('disabled');
            $("#ctlBtn").text("继续上传");
            $("#uploader .state").html("暂停中...");
            $("#uploader .progress-bar").removeClass('progress-bar-striped').removeClass('active');
        });
    });

        function downLoadFile() {
            window.open("/Home/Download")
        }

    </script>
</head>
<body>
    <div id="uploader" class="wu-example">
        <!--用来存放文件信息-->
        <div class="filename"></div>
        <div class="state"></div>
        <div class="progress">
            <div class="progress-bar progress-bar-info progress-bar-striped active" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style=" 0%">
                <span class="sr-only"></span>
            </div>
        </div>
        <div class="btns">
            <div id="picker">选择文件</div>
        </div>

        <div class="btns" style="margin-top:25px;" onclick="downLoadFile()">
            <div id="picker" class="webuploader-container"><div class="webuploader-pick">下载文件</div><div id="rt_rt_1deem09edokba40iet6gmkem2" style="position: absolute; top: 0px; left: 0px;  94px; height: 41px; overflow: hidden; bottom: auto; right: auto;"><input type="file" name="file" class="webuploader-element-invisible" multiple="multiple"><label style="opacity: 0;  100%; height: 100%; display: block; cursor: pointer; background: rgb(255, 255, 255);"></label></div></div>
        </div>
    </div>
</body>
</html>
View Code

4、后端代码如下:

namespace WebUploader.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            return View();
        }
        /// <summary>
        /// 分切片上传-异步
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        public ActionResult Upload()
        {
            string fileName = Request["name"];
            int index = Convert.ToInt32(Request["chunk"]);//当前分块序号
            var guid = Request["guid"];//前端传来的GUID号
            var dir = Server.MapPath("~/Upload");//文件上传目录
            dir = Path.Combine(dir, guid);//临时保存分块的目录
            if (!System.IO.Directory.Exists(dir))
                System.IO.Directory.CreateDirectory(dir);
            string filePath = Path.Combine(dir, index.ToString());//分块文件名为索引名,更严谨一些可以加上是否存在的判断,防止多线程时并发冲突
            var data = Request.Files["file"];//表单中取得分块文件
            if (data != null)//为null可能是暂停的那一瞬间
            {
                data.SaveAs(filePath);//报错
            }
            return Json(new { erron = 0 });//Demo,随便返回了个值,请勿参考
        }

        /// <summary>
        /// 合并切片
        /// </summary>
        /// <returns></returns>
        public ActionResult Merge()
        {
            var guid = Request["guid"];//GUID
            var uploadDir = Server.MapPath("~/Upload");//Upload 文件夹
            var dir = Path.Combine(uploadDir, guid);//临时文件夹
            var fileName = Request["fileName"];//文件名
            var files = System.IO.Directory.GetFiles(dir);//获得下面的所有文件
            var finalPath = Path.Combine(uploadDir, fileName);//最终的文件名(demo中保存的是它上传时候的文件名,实际操作肯定不能这样)
            var fs = new FileStream(finalPath, FileMode.Create);
            foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))//排一下序,保证从0-N Write
            {
                var bytes = System.IO.File.ReadAllBytes(part);
                fs.Write(bytes, 0, bytes.Length);
                bytes = null;
                System.IO.File.Delete(part);//删除分块
            }
            fs.Close();
            System.IO.Directory.Delete(dir);//删除文件夹
            return Json(new { error = 0 });//随便返回个值,实际中根据需要返回
        }

        #region 文件下载处理
        /// <summary>
          /// 下载文件,支持大文件、续传、速度限制。支持续传的响应头Accept-Ranges、ETag,请求头Range 。
          /// Accept-Ranges:响应头,向客户端指明,此进程支持可恢复下载.实现后台智能传输服务(BITS),值为:bytes;
          /// ETag:响应头,用于对客户端的初始(200)响应,以及来自客户端的恢复请求,
          /// 必须为每个文件提供一个唯一的ETag值(可由文件名和文件最后被修改的日期组成),这使客户端软件能够验证它们已经下载的字节块是否仍然是最新的。
          /// Range:续传的起始位置,即已经下载到客户端的字节数,值如:bytes=1474560- 。
          /// 另外:UrlEncode编码后会把文件名中的空格转换中+(+转换为%2b),但是浏览器是不能理解加号为空格的,所以在浏览器下载得到的文件,空格就变成了加号;
         /// 解决办法:UrlEncode 之后, 将 "+" 替换成 "%20",因为浏览器将%20转换为空格
         /// </summary>
        /// <param name="httpContext">当前请求的HttpContext</param>
         /// <param name="filePath">下载文件的物理路径,含路径、文件名</param>
         /// <param name="speed">下载速度:每秒允许下载的字节数</param>
         /// <returns>true下载成功,false下载失败</returns>
        public static bool DownloadFile(HttpContext httpContext, string filePath, long speed)
        {
            bool ret = true;
            try
            {
                #region 验证:HttpMethod,请求的文件是否存在
                switch (httpContext.Request.HttpMethod.ToUpper())
                { //目前只支持GET和HEAD方法
                    case "GET":
                    case "HEAD":
                        break;
                    default:
                        httpContext.Response.StatusCode = 501;
                        return false;
                }
                if (!System.IO.File.Exists(filePath))
                {
                    httpContext.Response.StatusCode = 404;
                    return false;
                }
                #endregion

                #region 定义局部变量
                long startBytes = 0;
                int packSize = 1024 * 10; //分块读取,每块10K bytes
                string fileName = Path.GetFileName(filePath);
                FileStream myFile = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                BinaryReader br = new BinaryReader(myFile);
                long fileLength = myFile.Length;

                int sleep = (int)Math.Ceiling(1000.0 * packSize / speed);//毫秒数:读取下一数据块的时间间隔
                string lastUpdateTiemStr = System.IO.File.GetLastWriteTimeUtc(filePath).ToString("r");
                string eTag = HttpUtility.UrlEncode(fileName, Encoding.UTF8) + lastUpdateTiemStr;//便于恢复下载时提取请求头;
                #endregion

                //--验证:文件是否太大,是否是续传,且在上次被请求的日期之后是否被修改过--------------

                try
                {
                    //-------添加重要响应头、解析请求头、相关验证-------------------

                    #region -------向客户端发送数据块-------------------
                    br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                    int maxCount = (int)Math.Ceiling((fileLength - startBytes + 0.0) / packSize);//分块下载,剩余部分可分成的块数
                    for (int i = 0; i < maxCount && httpContext.Response.IsClientConnected; i++)
                    {//客户端中断连接,则暂停
                        httpContext.Response.BinaryWrite(br.ReadBytes(packSize));
                        httpContext.Response.Flush();
                        if (sleep > 1) Thread.Sleep(sleep);
                    }
                    #endregion
                }
                catch
                {
                    ret = false;
                }
                finally
                {
                    br.Close();
                    myFile.Close();
                }
            }
            catch
            {
                ret = false;
            }
            return ret;
        }
        #endregion

        public ActionResult Download()
        {
            string filePath = Server.MapPath("~/Upload/TortoiseSVN-1.8.11.26392-x64.zip");
            string fileName = "TortoiseSVN-1.8.11.26392-x64.zip";
            return new FileResult(filePath, fileName);
        }
    }

    /// <summary>
    /// 该类继承了ActionResult,通过重写ExecuteResult方法,进行文件的下载
    /// </summary>
    public class FileResult : ActionResult
    {
        private readonly string _filePath;//文件路径
        private readonly string _fileName;//文件名称
        public FileResult(string filePath, string fileName)
        {
            _filePath = filePath;
            _fileName = fileName;
        }

        public override void ExecuteResult(ControllerContext context)
        {
            string fileName = _fileName;
            HttpResponseBase response = context.HttpContext.Response;
            if (System.IO.File.Exists(_filePath))
            {
                FileStream fs = null;
                byte[] fileBuffer = new byte[1024];//每次读取1024字节大小的数据
                try
                {
                    using (fs = System.IO.File.OpenRead(_filePath))
                    {
                        long totalLength = fs.Length;
                        response.ContentType = "application/octet-stream";
                        response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
                        while (totalLength > 0 && response.IsClientConnected)//持续传输文件
                        {
                            int length = fs.Read(fileBuffer, 0, fileBuffer.Length);//每次读取1024个字节长度的内容
                            fs.Flush();
                            response.OutputStream.Write(fileBuffer, 0, length);//写入到响应的输出流
                            response.Flush();//刷新响应
                            totalLength = totalLength - length;
                        }
                        response.Close();//文件传输完毕,关闭相应流
                    }
                }
                catch (Exception ex)
                {
                    response.Write(ex.Message);
                }
                finally
                {
                    if (fs != null)
                        fs.Close();//最后记得关闭文件流
                }
            }
        }
    }
}
View Code

5、说明如下

上传时,会将大附件切成切片并存在一个临时文件夹中,待所有切片上传成功后,会调用Merge()方法合成文件!随后删除切片文件夹!

上述代码中包含一个下载附件的代码!

时间有限,没时间写博客,太忙了!

关于下载的方法,优化如下:

场景:如果遇到打包压缩后再下载,则下载完成后有可能需要删除压缩后的文件,现优化如下:

关于压缩文件可参考:C# 压缩文件

2019年7月17日 20点26分

增加是否可以删除下载的文件,如下:

    public class downLoadFileResult : ActionResult
    {
        private readonly string _filePath;//文件路径
        private readonly string _fileName;//文件名称
        private readonly bool _isDeleted;//下载完成后,是否可删除
        /// <summary>
        /// 构造删除
        /// </summary>
        /// <param name="filePath">路径</param>
        /// <param name="fileName">文件名</param>
        /// <param name="isDeleted">下载完成后,是否可删除</param>
        public downLoadFileResult(string filePath, string fileName,bool isDeleted)
        {
            _filePath = filePath;
            _fileName = fileName;
            _isDeleted = isDeleted;
        }

        public override void ExecuteResult(ControllerContext context)
        {
            string fileName = _fileName;
            HttpResponseBase response = context.HttpContext.Response;
            
            if (System.IO.File.Exists(_filePath))
            {
                FileStream fs = null;
                byte[] fileBuffer = new byte[1024];//每次读取1024字节大小的数据
                try
                {
                    using (fs = System.IO.File.OpenRead(_filePath))
                    {
                        long totalLength = fs.Length;
                        response.ContentType = "application/octet-stream";
                        response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
                        while (totalLength > 0 && response.IsClientConnected)//持续传输文件
                        {
                            int length = fs.Read(fileBuffer, 0, fileBuffer.Length);//每次读取1024个字节长度的内容
                            fs.Flush();
                            response.OutputStream.Write(fileBuffer, 0, length);//写入到响应的输出流
                            response.Flush();//刷新响应
                            totalLength = totalLength - length;
                        }
                        response.Close();//文件传输完毕,关闭相应流
                    }
                }
                catch (Exception ex)
                {
                    response.Write(ex.Message);
                }
                finally
                {

                    if (fs != null)
                    {
                        fs.Close();//最后记得关闭文件流
                        if (_isDeleted)
                        {
                            System.IO.File.Delete(_filePath);
                        }
                    }
                }
            }
        }
    }
View Code

如果附件比较大,例如超过一个GB,则需要分块下载

        /// <summary>
        ///  Response分块下载,输出硬盘文件,提供下载 支持大文件、续传、速度限制、资源占用小
        /// </summary>
        /// <param name="fileName">客户端保存的文件名</param>
        /// <param name="filePath">客户端保存的文件路径(包括文件名)</param>
        /// <returns></returns>
        /// <summary>
        /// 使用OutputStream.Write分块下载文件  
        /// </summary>
        /// <param name="filePath"></param>
        public void PostDownFile(string path, string name)
        {
            string fileName = name;
            LogHelper.WriteTextLog("读取文件", path, DateTime.Now);
            path = EncodeHelper.DefaultDecrypt(path);
            LogHelper.WriteTextLog("读取文件成功", path, DateTime.Now);
            var ef = CfDocument.GetByCondition("Url='" + path + "'").FirstOrDefault();
            //防止带有#号文件名
            if (ef != null && !string.IsNullOrEmpty(ef.Documentname))
            {
                fileName = ef.Documentname;
            }
            var filePath = HttpContext.Current.Server.MapPath("~" + path);
            if (!File.Exists(filePath))
            {
                return;
            }
            FileInfo info = new FileInfo(filePath);
            //指定块大小   
            long chunkSize = 4096;
            //建立一个4K的缓冲区   
            byte[] buffer = new byte[chunkSize];
            //剩余的字节数   
            long dataToRead = 0;
            FileStream stream = null;
            try
            {
                //打开文件   
                stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

                dataToRead = stream.Length;

                //添加Http头   
                HttpContext.Current.Response.Charset = "UTF-8";
                HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpContext.Current.Server.UrlEncode(fileName));
                while (dataToRead > 0)
                {
                    if (HttpContext.Current.Response.IsClientConnected)
                    {
                        int length = stream.Read(buffer, 0, Convert.ToInt32(chunkSize));
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
                        HttpContext.Current.Response.Flush();
                        HttpContext.Current.Response.Clear();
                        dataToRead -= length;
                    }
                    else
                    {
                        //防止client失去连接   
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                HttpContext.Current.Response.Write("Error:" + ex.Message);
            }
            finally
            {
                if (stream != null)
                {
                    stream.Close();
                }
                HttpContext.Current.Response.Close();
            }

        }
View Code

只需将上述方法写在webApi中

@陈卧龙的博客

原文地址:https://www.cnblogs.com/chenwolong/p/webuploader.html