.Net Core WebAPI + Axios +Vue 实现下载与下载进度条

故事的开始

老板说:系统很慢,下载半个小时无法下载,是否考虑先压缩再给用户下载?

                     

 

  本来是已经压缩过了,不过第一反应应该是用户下的数量多,导致压缩包很大,然后自己测试发现,只是等待的时间比较久而已,仍然是下载状态中,并不是系统慢,但是用户体验肯定是最直观的,确实是我们做得不够好,单纯弹出遮罩层显示冰冷的“拼命加载中……”,对用户来说确实不够友好。嗯,了解实际情况了,那就开撸,增加用户体验。

 解决它

效果图:

 

 

Vue+ElementUI

 <el-progress v-if="dlProgress>0" :text-inside="true" :stroke-width="18" :percentage="dlProgress" status="success" style="margin-bottom:10px"></el-progress>

Axios

downloadTask(index,row) {
      let own =this;
      this.fullscreenLoading = true;
      this.axios({
        method: 'post',
        url: this.baseUrl + '/api/Task/DownLoad',
        data: {id: row.id},
        responseType: 'blob',
     //敲黑板 onDownloadProgress (progress) { own.dlProgress
=Math.round(progress.loaded / progress.total * 100); } }) .then((res) => { this.fullscreenLoading = false; let fileName = decodeURI(res.headers["content-disposition"].split("=")[1]); let url = window.URL.createObjectURL(new Blob([res.data])); let link = document.createElement('a'); link.style.display = 'none'; link.href = url; link.setAttribute('download', fileName); document.body.appendChild(link); link.click();
     document.body.removeChild(link); 
this.$message.success('下载成功'); }) .catch(() => { this.fullscreenLoading = false; }); },

下载:

 protected IActionResult DownLoad(string fullFilePath)
        {
            var fileName = Path.GetFileName(fullFilePath);
            HttpContext.Response.Headers.Append("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName));

            var contentType = Common.Helper.FileHelper.GetContentType(fileName);
            var stream = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            return File(stream, contentType);
        }

        protected IActionResult DownLoad(VDownloadByte download)
        {
            if (string.IsNullOrEmpty(download.fileName))
                return new JsonResult(ShowError("生成文件失败"));
            var fileName = Path.GetFileName(download.fileName);
            HttpContext.Response.Headers.Append("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName)); 
            var contentType = Common.Helper.FileHelper.GetContentType(fileName); 
            return File(download.fileByte, contentType);
        }

        protected IActionResult DownLoad(VDownloadStream download)
        {
            if (string.IsNullOrEmpty(download.fileName))
                return new JsonResult(ShowError("生成文件失败"));
            var fileName = Path.GetFileName(download.fileName);
            HttpContext.Response.Headers.Append("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName));
            var contentType = Common.Helper.FileHelper.GetContentType(fileName);
            return File(download.Stream, contentType);
        }
View Code

分片下载:

        /// <summary>
        /// 手动分片下载
        /// </summary>
        protected async Task<IActionResult> DownLoadBlock(string fullFilePath)
        {
            var fileName = Path.GetFileName(fullFilePath);
            int bufferSize = 1024;
            Response.ContentType = FileHelper.GetContentType(fileName); 
            Response.Headers.Append("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName));

            using (FileStream fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                using (Response.Body)
                {
                    long contentLength = fs.Length;
                    Response.ContentLength = contentLength;

                    byte[] buffer;
                    long hasRead = 0;

                    while (hasRead < contentLength)
                    {
                        if (HttpContext.RequestAborted.IsCancellationRequested)
                        {
                            break;
                        }

                        buffer = new byte[bufferSize];
                        int currentRead = fs.Read(buffer, 0, bufferSize);
                        await Response.Body.WriteAsync(buffer, 0, currentRead);
                        await Response.Body.FlushAsync();
                        hasRead += currentRead;
                    }
                }
            }

            return new EmptyResult();
        }
View Code

完美~

 

posted @ 2020-06-09 17:27  山治先生  阅读(546)  评论(0编辑  收藏