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public 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 = 200; //每秒5次 即5*10K bytes每秒
int sleep = (int)(1000 * pack / _speed) + 1;
//int sleep =(int)System.Math.Floor(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)((fileLength - startBytes) / pack) + 1;
//int maxCount =(int)System.Math.Floor((fileLength - startBytes) / pack) + 1;
for (int i = 0; i < maxCount; i++)
{
if (_Response.IsClientConnected)
{
_Response.BinaryWrite(br.ReadBytes(pack));
}
else
{
i = maxCount;
}
}
}
catch
{
return false;
}
finally
{
br.Close();
myFile.Close();
_Response.Close();
}
}
catch (Exception ex)
{
return false;
}
return true;
}
/// <summary>
/// 为字符串中的非英文字符编码
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string ToHexString(string s)
{
char[] chars = s.ToCharArray();
StringBuilder builder = new StringBuilder();
for (int index = 0; index < chars.Length; index++)
{
bool needToEncode = NeedToEncode(chars[index]);
if (needToEncode)
{
string encodedString = ToHexString(chars[index]);
builder.Append(encodedString);
}
else
{
builder.Append(chars[index]);
}
}
return builder.ToString();
}
/// <summary>
///指定 一个字符是否应该被编码
/// </summary>
/// <param name="chr"></param>
/// <returns></returns>
private static bool NeedToEncode(char chr)
{
string reservedChars = "$-_.+!*'(),@=&";
if (chr > 127)
return true;
if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0)
return false;
return true;
}
/// <summary>
/// 为非英文字符串编码
/// </summary>
/// <param name="chr"></param>
/// <returns></returns>
private static string ToHexString(char chr)
{
UTF8Encoding utf8 = new UTF8Encoding();
byte[] encodedBytes = utf8.GetBytes(chr.ToString());
StringBuilder builder = new StringBuilder();
for (int index = 0; index < encodedBytes.Length; index++)
{
builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));
}
return builder.ToString();
}