求教關於斷點上傳的問題，急！＊＊＊

Question

目前做一個項目，客戶要求可以斷點上傳，以前沒做過，求相關解決方案。

Answer 1

b/s模式?C/S的 话 数据 可以按流 读入
并记录 已经读取流的当前长度
下次从此位置 开始 继续读取 上传.

Answer 2

http://www.21tx.com/dev/2004/03/26/10458.html
http://blog.csdn.net/ayun00/archive/2006/07/11/904412.aspx

Answer 3

http://softgroup.blogchina.com/912009.html
http://www.mimi163.net/cs/wenzhang/2006/2/15/610.htm

Answer 4

Asp.net实现多线程断点续传
http://tech.acnow.net/Html/Web/ASPNET/ASPNET_Skill/2006-5/2/01202906520120294391464_2.shtml
http://www.xfok.com/Tech/.Net/ASP_NET/2004/10-31/8465,34.aspx

Answer 5

System.IO.Stream iStream = null;            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10240];            // Length of the file:
            int length;            // Total bytes to read:
            long dataToRead;            // Identify the file to download including its path.
            string filepath  = @"E:\software\SQL Server 2000 Personal Edition.ISO";            // Identify the file name.
            string  filename  = System.IO.Path.GetFileName(filepath);            try
            {
                // Open the file.
                iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, 
                    System.IO.FileAccess.Read,System.IO.FileShare.Read);
                Response.Clear();                // Total bytes to read:
                dataToRead = iStream.Length;                long p = 0;
                if(Request.Headers["Range"]!=null)
                {
                    Response.StatusCode = 206;
                    p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
                }
                if(p != 0)
                {
                    Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());                    
                }
                Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString());
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));                iStream.Position = p;
                dataToRead = dataToRead - p;
                // Read the bytes.
                while (dataToRead > 0)
                {
                    // Verify that the client is connected.
                    if (Response.IsClientConnected) 
                    {
                        // Read the data in buffer.
                        length = iStream.Read(buffer, 0, 10240);                        // Write the data to the current output stream.
                        Response.OutputStream.Write(buffer, 0, length);                        // Flush the data to the HTML output.
                        Response.Flush();                        buffer= new Byte[10240];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        //prevent infinite loop if user disconnects
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex) 
            {
                // Trap the error, if any.
                Response.Write("Error : " + ex.Message);
            }
            finally
            {
                if (iStream != null) 
                {
                    //Close the file.
                    iStream.Close();
                }
                   Response.End();
            }

Answer 6

public void download(string remFileName,string 
locFileName,Boolean resume)
{
if(!logined)
{
login();
}setBinaryMode(true);//Console.WriteLine("Downloading file "+remFileName+" from "+remoteHost + "/"+remotePath);if (locFileName.Equals(""))
{
locFileName = remFileName;
}if(!File.Exists(locFileName))
{
Stream st = File.Create(locFileName);
st.Close();
}FileStream output = new 
FileStream(locFileName,FileMode.Open);Socket cSocket = createDataSocket();long offset = 0;if(resume)
{offset = output.Length;if(offset > 0 )
{
sendCommand("REST "+offset);
if(retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Some servers may not support resuming.
offset = 0;
}
}if(offset > 0)
{
//if(debug)
//{
//Console.WriteLine("seeking to " + offset);
//}
long npos = output.Seek(offset,SeekOrigin.Begin);
//Console.WriteLine("new pos="+npos);
}
}sendCommand("RETR " + remFileName);if(!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}while(true)
{bytes = cSocket.Receive(buffer, buffer.Length, 0);
output.Write(buffer,0,bytes);if(bytes <= 0)
{
break;
}
}output.Close();
if (cSocket.Connected)
{
cSocket.Close();
}//Console.WriteLine("");readReply();if( !(retValue == 226 || retValue == 250) )
{
throw new IOException(reply.Substring(4));
}}

Answer 7

也可以参考一下这个
http://www.cnblogs.com/gxh973121/archive/2006/06/06/418935.html
http://blog.csdn.net/playyuer/archive/2004/08/02/58430.aspx