/// <summary>
/// 编 码 人:苏飞
/// 联系方式:361983679
/// 更新网站:http://www.sufeinet.com/thread-655-1-1.html
/// </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">age.Request对象</param>
/// <param name="_Response">age.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;
}
}
}
coody 发表于 2013-8-21 11:00
kyi 可以搞个列子吗
coody 发表于 2013-8-21 11:22
D:\Users\Administrator\Desktop\QQ群下载地址研究\qq.qun\FileDown.cs(126,63) : 错误 CS0246: 未能找到类 ...
gharbor 发表于 2014-4-3 00:03
请问一下,这个是用那个版本的.net 库
站长苏飞 发表于 2014-4-3 08:03
2.0就可以了
但是我这边运行老是提示出错,是怎么回事?gharbor 发表于 2014-4-3 23:37
但是我这边运行老是提示出错,是怎么回事?
站长苏飞 发表于 2014-4-4 07:54
这不提示的很明确吗,你没有引用这些命名空间。大部分在System.Web下,不知道的百度一下
gharbor 发表于 2014-4-4 13:35
是没有引用的问题,但是现在却提示下图的错误使用的下载链接是http://download.pplive.com/pptvsetup_3.2 ...
站长苏飞 发表于 2014-4-4 13:41
打出来FileName内容看看
真言禁书 发表于 2014-9-27 18:30
请问这个类支持WINFORM嘛?
xxxxxxxxxxxxxxxxxxxxxxx
gaide168 发表于 2016-7-24 17:04
老大.怎样实现 下载进度回调呢..

| 欢迎光临 苏飞论坛 (http://www.sufeinet.com/) | Powered by Discuz! X3.4 |