api下载文件
net
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/// <summary> ///字符流下载方法 /// </summary> /// <param name="fileName">下载文件生成的名称</param> /// <param name="fPath">下载文件路径</param> /// <returns></returns> public void DownloadFile(string fileName, string fPath) { string filePath = Server.MapPath(fPath);//路径 //以字符流的形式下载文件 FileStream fs = new FileStream(filePath, FileMode.Open); byte[] bytes = new byte[(int)fs.Length]; fs.Read(bytes, 0, bytes.Length); fs.Close(); Response.ContentType = "application/octet-stream"; //通知浏览器下载文件而不是打开 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)); // 添加头信息,指定文件大小,让浏览器能够显示下载进度 Response.AddHeader("Content-Length", file.Length.ToString()); Response.BinaryWrite(bytes); Response.Flush(); Response.End(); }
WriteFile实现下载
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string fileName ="aaa.zip";//客户端保存的文件名 string filePath=Server.MapPath("DownLoad/aaa.zip");//路径 FileInfo fileInfo = new FileInfo(filePath); Response.Clear(); Response.ClearContent(); Response.ClearHeaders(); Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); Response.AddHeader("Content-Length", fileInfo.Length.ToString()); Response.AddHeader("Content-Transfer-Encoding", "binary"); Response.ContentType = "application/octet-stream"; Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); Response.WriteFile(fileInfo.FullName); Response.Flush(); Response.End();
Response.TransmitFile(filePath);
WriteFile分块下载
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string fileName = "aaa.zip";//客户端保存的文件名 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath); if (fileInfo.Exists == true) { const long ChunkSize = 102400;//100K 每次读取文件,只读取100K,这样可以缓解服务器的压力 byte[] buffer = new byte[ChunkSize]; Response.Clear(); System.IO.FileStream iStream = System.IO.File.OpenRead(filePath); long dataLengthToRead = iStream.Length;//获取下载的文件总大小 Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName)); while (dataLengthToRead > 0 && Response.IsClientConnected) { int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小 Response.OutputStream.Write(buffer, 0, lengthRead); Response.Flush(); dataLengthToRead = dataLengthToRead - lengthRead; } Response.Close(); }
WEBAPI
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public HttpResponseMessage DownloadByPath(string filePath) { try { if (!File.Exists(filePath)) { filePath = MapPath(filePath); if (!File.Exists(filePath)) { throw new HttpResponseException(HttpStatusCode.NotFound); } } FileStream fileStream = new FileStream(filePath, FileMode.Open); HttpResponseMessage fullResponse = Request.CreateResponse(HttpStatusCode.OK); fullResponse.Content = new StreamContent(fileStream); MediaTypeHeaderValue _mediaType = MediaTypeHeaderValue.Parse("application/octet-stream");//指定文件类型 ContentDispositionHeaderValue _disposition = ContentDispositionHeaderValue.Parse("attachment;filename=" + System.Web.HttpUtility.UrlEncode(Path.GetFileName(filePath)));//指定文件名称 System.Web.HttpUtility.UrlEncode 不加失败 fullResponse.Content.Headers.ContentType = _mediaType; fullResponse.Content.Headers.ContentDisposition = _disposition; return fullResponse; } catch (Exception ex) { Logger.Error(ex); throw new HttpResponseException(HttpStatusCode.NotFound); } }
System.Web.HttpUtility.UrlEncode 出错更改
fullResponse.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = docName };
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var url = API接口; let link = document.createElement('a'); link.href = url; link.target = "_blank"; link.click(); window.URL.revokeObjectURL(link.href);
API 传输数据加密