Asp.net(c#)二进制上传 and 实现多线程断点续传

http://hi.baidu.com/earnandlearn/blog/item/cbc397f812abc89d59ee90b7.html

 

 

 

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;

public partial class _Default : System.Web.UI.Page {    protected void Page_Load(object sender, EventArgs e)    {       // string datastr=FileToData(Server.MapPath("neteaselogo.gif"));              // DataToFile(datastr,Server.MapPath("logo.gif"));        upfile();            }    public static string FileToData(string path)    {        if (File.Exists(path))        {            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);            int fileLenght = Convert.ToInt32(fs.Length);            byte[] bytes = new byte[fileLenght];            BinaryReader br = new BinaryReader(fs);            for (int i = 0; i <= fileLenght; i++)            {                br.Read(bytes, 0, fileLenght);            }            string strdata = Convert.ToBase64String(bytes);            fs.Close();            br.Close();            return strdata;        }        return null;    }    public void DataToFile(string strdata, string path)    {        FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);        BinaryWriter bw = new BinaryWriter(fs);        bw.Write(Convert.FromBase64String(strdata));                Response.OutputStream.Write(Convert.FromBase64String(strdata), 0, strdata.Length);        bw.Close();        fs.Close();    }    public void upfile()     {        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:软件办公sql2005sql2005_one.iso";

        // Identify the file name.        string filename = System.IO.Path.GetFileName(filepath);

        try        {            // Open the file.            iStream = new FileStream(filepath, System.IO.FileMode.Open,              FileAccess.Read, 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();        }    }}