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/// <summary> /// 编 码 人：苏飞 /// 联系方式：361983679 /// 更新网站：[url=http://www.sufeinet.com/thread-655-1-1.html]http://www.sufeinet.com/thread-655-1-1.html[/url] /// </summary> using System; using System.IO; using System.Threading; using System.Web; namespace DotNet.Utilities { /// <summary> /// 文件下载类 /// </summary> public class FileDown { public FileDown() { } /// <summary> /// 参数为虚拟路径 /// </summary> public static string FileNameExtension(string FileName) { return Path.GetExtension(MapPathFile(FileName)); } /// <summary> /// 获取物理地址 /// </summary> public static string MapPathFile(string FileName) { return HttpContext.Current.Server.MapPath(FileName); } /// <summary> /// 普通下载 /// </summary> /// <param name="FileName">文件虚拟路径</param> public static void DownLoadold(string FileName) { string destFileName = MapPathFile(FileName); if (File.Exists(destFileName)) { FileInfo fi = new FileInfo(destFileName); HttpContext.Current.Response.Clear(); HttpContext.Current.Response.ClearHeaders(); HttpContext.Current.Response.Buffer = false; HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Path.GetFileName(destFileName), System.Text.Encoding.UTF8)); HttpContext.Current.Response.AppendHeader("Content-Length", fi.Length.ToString()); HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.WriteFile(destFileName); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.End(); } } /// <summary> /// 分块下载 /// </summary> /// <param name="FileName">文件虚拟路径</param> public static void DownLoad(string FileName) { string filePath = MapPathFile(FileName); long chunkSize = 204800; //指定块大小 byte[] buffer = new byte[chunkSize]; //建立一个200K的缓冲区 long dataToRead = 0; //已读的字节数 FileStream stream = null; try { //打开文件 stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read); dataToRead = stream.Length; //添加Http头 HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.AddHeader("Content-Disposition", "attachement;filename=" + HttpUtility.UrlEncode(Path.GetFileName(filePath))); HttpContext.Current.Response.AddHeader("Content-Length", dataToRead.ToString()); while (dataToRead > 0) { if (HttpContext.Current.Response.IsClientConnected) { int length = stream.Read(buffer, 0, Convert.ToInt32(chunkSize)); HttpContext.Current.Response.OutputStream.Write(buffer, 0, length); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.Clear(); dataToRead -= length; } else { dataToRead = -1; //防止client失去连接 } } } catch (Exception ex) { HttpContext.Current.Response.Write("Error:" + ex.Message); } finally { if (stream != null) stream.Close(); HttpContext.Current.Response.Close(); } } /// <summary> /// 输出硬盘文件，提供下载 支持大文件、续传、速度限制、资源占用小 /// </summary> /// <param name="_Request">;Page.Request对象</param> /// <param name="_Response">;Page.Response对象</param> /// <param name="_fileName">下载文件名</param> /// <param name="_fullPath">带文件名下载路径</param> /// <param name="_speed">每秒允许下载的字节数</param> /// <returns>返回是否成功</returns> //--------------------------------------------------------------------- //调用： // string FullPath=Server.MapPath("count.txt"); // ResponseFile(this.Request,this.Response,"count.txt",FullPath,100); //--------------------------------------------------------------------- public static bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed) { try { FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); BinaryReader br = new BinaryReader(myFile); try { _Response.AddHeader("Accept-Ranges", "bytes"); _Response.Buffer = false; long fileLength = myFile.Length; long startBytes = 0; int pack = 10240; //10K bytes int sleep = (int)Math.Floor((double)(1000 * pack / _speed)) + 1; if (_Request.Headers["Range"] != null) { _Response.StatusCode = 206; string[] range = _Request.Headers["Range"].Split(new char[] { '=', '-' }); startBytes = Convert.ToInt64(range[1]); } _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString()); if (startBytes != 0) { _Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength)); } _Response.AddHeader("Connection", "Keep-Alive"); _Response.ContentType = "application/octet-stream"; _Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8)); br.BaseStream.Seek(startBytes, SeekOrigin.Begin); int maxCount = (int)Math.Floor((double)((fileLength - startBytes) / pack)) + 1; for (int i = 0; i < maxCount; i++) { if (_Response.IsClientConnected) { _Response.BinaryWrite(br.ReadBytes(pack)); Thread.Sleep(sleep); } else { i = maxCount; } } } catch { return false; } finally { br.Close(); myFile.Close(); } } catch { return false; } return true; } } }
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站长苏飞 发表于 2013-4-2 15:10 恩是的
7685780 发表于 2013-4-2 15:07 FileDown.DownLoad("http://www.baidu.com/1.rar"); 是这样传的吗?
huataishi 发表于 2013-4-23 14:34 具体如何调用，有没有实例参考
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发表于 2013-4-2 08:31:55
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发表于 2014-5-8 18:36:22
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