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【Asp.Net】 web实现文件下载

作者:Sarah / 发布于2015/3/24/ 740


	//流方式下载
	 protected void Button4_Click(object sender, EventArgs e)
	 {
	 string fileName = "aaa.txt";//客户端保存的文件名
	 string filePath = Server.MapPath("DownLoad/aaa.txt");//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));
	 Response.BinaryWrite(bytes);
	 Response.Flush();
	 Response.End();
	 }

	
	 //WriteFile分块下载
	 protected void Button3_Click(object sender, EventArgs e)
	 {
	 string fileName = "aaa.accdb";//客户端保存的文件名
	 string filePath = Server.MapPath("DownLoad/11123.accdb");//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, System.Text.Encoding.UTF8));
	 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();
	 }
	 }

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