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asp.net文件的方法

時間: 陳哲凡673 分享

asp.net文件的方法

  ASP 是一項微軟公司的技術,是一種使嵌入網(wǎng)頁中的腳本,可由因特網(wǎng)服務器執(zhí)行的服務器端腳本技術。下面是學習啦小編為大家?guī)砹艘黄猘sp.net下載文件的方法,希望對大家有所幫助。

  asp.net下載文件的方法(一)

  public class FileDown

  {

  public FileDown()

  { }

  /// <summary>

  /// 參數(shù)為虛擬路徑

  /// </summary>

  public static string FileNameExtension(string FileName)

  {

  return Path.GetExtension(MapPathFile(FileName));

  }

  /// <summary>

  /// asp.net下載文件的方法:獲取物理地址

  /// </summary>

  public static string MapPathFile(string FileName)

  {

  return HttpContext.Current.Server.MapPath(FileName);

  }

  /// <summary>

  /// 普通下載

  /// </summary>

  /// <param name="FileName">文件虛擬路徑</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>

  /// asp.net分塊下載

  /// </summary>

  /// <param name="FileName">文件虛擬路徑</param>

  public static void DownLoad(string FileName)

  {

  string filePath = MapPathFile(FileName);

  long chunkSize = 204800; //指定塊大小

  byte[] buffer = new byte[chunkSize]; //建立一個200K的緩沖區(qū)

  long dataToRead = 0; //已讀的字節(jié)數(shù)

  FileStream stream = null;

  try

  {

  //打開文件

  stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

  dataToRead = stream.Length;

  //添加Http頭

  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失去連接

  }

  }

  }

  catch (Exception ex)

  {

  HttpContext.Current.Response.Write("Error:" + ex.Message);

  }

  finally

  {

  if (stream != null) stream.Close();

  HttpContext.Current.Response.Close();

  }

  }

  /// <summary>

  /// 輸出硬盤文件,提供下載 支持大文件、續(xù)傳、速度限制、資源占用小

  /// </summary>

  /// <param name="_Request">Page.Request對象</param>

  /// <param name="_Response">Page.Response對象</param>

  /// <param name="_fileName">下載文件名</param>

  /// <param name="_fullPath">帶文件名下載路徑</param>

  /// <param name="_speed">每秒允許下載的字節(jié)數(shù)</param>

  /// <returns>返回是否成功</returns>

  //---------------------------------------------------------------------

  //調(diào)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;

  }

  }

asp.net下載文件的方法(二)

  1 string fileName = "aaa.zip";//客戶端保存的文件名

  2 string filePath = Server.MapPath("DownLoad/aaa.zip");//路徑

  3

  4 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

  5

  6 if (fileInfo.Exists == true)

  7 {

  8 const long ChunkSize = 102400;//100K 每次讀取文件,只讀取100K,這樣可以緩解服務器的壓力

  9 byte[] buffer = new byte[ChunkSize];

  10

  11 Response.Clear();

  12 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);

  13 long dataLengthToRead = iStream.Length;//獲取下載的文件總大小

  14 Response.ContentType = "application/octet-stream";

  15 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));

  16 while (dataLengthToRead > 0 && Response.IsClientConnected)

  17 {

  18 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//讀取的大小

  19 Response.OutputStream.Write(buffer, 0, lengthRead);

  20 Response.Flush();

  21 dataLengthToRead = dataLengthToRead - lengthRead;

  22 }

  23 Response.Close();

  24 }

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