//(1)返回filestream 其中:“text/plain”是文件MIME类型 public FileStreamResult download() { string fileName = "aaa.txt";//客户端保存的文件名 string filePath = Server.MapPath("~/Document/123.txt");//路径 return File(new System.IO.FileStream(filePath, System.IO.FileMode.Open), "text/plain", fileName); } //(2)返回file public FileResult downloadA() { string filePath = Server.MapPath("~/Document/123.txt");//路径 return File(filePath, "text/plain", "welcome.txt"); //welcome.txt是客户端保存的名字 } public ActionResult FileStreamDownload1() { var stream = new System.Net.WebClient().OpenRead("http://files.cnblogs.com/ldp615/Mvc_TextBoxFor.rar"); return File(stream, "application/x-zip-compressed", "test.rar"); }
//(3)TransmitFile方法 public void downloadB() { string fileName = "aaa.txt";//客户端保存的文件名 string filePath = Server.MapPath("~/Document/123.txt");//路径 System.IO.FileInfo fileinfo = new System.IO.FileInfo(filePath); Response.Clear(); //清除缓冲区流中的所有内容输出 Response.ClearContent(); //清除缓冲区流中的所有内容输出 Response.ClearHeaders(); //清除缓冲区流中的所有头 Response.Buffer = true; //该值指示是否缓冲输出,并在完成处理整个响应之后将其发送 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); Response.AddHeader("Content-Length", fileinfo.Length.ToString()); Response.AddHeader("Content-Transfer-Encoding", "binary"); Response.ContentType = "application/unknow"; //获取或设置输出流的 HTTP MIME 类型 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); //获取或设置输出流的 HTTP 字符集 Response.TransmitFile(filePath); Response.End(); } //(4)Response分块下载 public void downloadC() { string fileName = "aaa.txt";//客户端保存的文件名 string filePath = Server.MapPath("~/Document/123.txt");//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(); } }