js代码
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> <script src="Scripts/jquery-3.3.1.js"></script> <script> function download() { var url = '/Order/DownloadResource?o=90&t=bf32a13f4701473a9385896f5578953d'; var xhr = new XMLHttpRequest(); xhr.open('POST', url, true); // 也可以使用POST方式，根据接口 xhr.responseType = "blob"; // 返回类型blob xhr.onload = function () { if (this.status === 200) { var blob = this.response; var reader = new FileReader(); reader.readAsDataURL(blob); // 转换为base64，可以直接放入a表情href reader.onload = function (e) { var a = document.createElement('a'); a.download = 'data.rar';//下载文件名 a.href = e.target.result; $("body").append(a); // 修复firefox中无法触发click a.click(); $(a).remove(); } } }; // 发送ajax请求 xhr.send() } </script> </head> <body> <input type="button" value="下载" onclick="download()" /> </body> </html>
后台代码
[HttpPost] public void Download(string o, string t) { string filePath = @"D:Download排期（20190412）.xlsx"; #region 处理下文件 var arr= filePath.Split('\'); string fileName = arr[arr.Length-1]; 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(); Response.End(); } #endregion }