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asp.net文件下载，多任务并行有进度条(2012-10-1815:36)

原作者: [db:作者] 来自: [db:来源] 收藏 邀请 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="RenameDownload.aspx.cs" Inherits="DownloadProxy.RenameDownload" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        body
        {
            font-size:12px;
            }
        table
        {
            background-color:Gray;
            }
            
        td
        {
            background-color:White;
            }
    </style>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:scriptmanager runat="server" EnablePageMethods="true"></asp:scriptmanager>
    <script type="text/javascript">
        window.onbeforeunload = function () {
            return false;
        };

        //PageMethods.set_timeout(5000);
        PageMethods.set_defaultFailedCallback = "OnFailed";
        
        function OnFailed(ErrorHander) {
            var ErrorMessage = 'Timeout:' + ErrorHander.get_timedOut() + ',Error Message：' + ErrorHander.get_message();
            ErrorMessage = ErrorMessage + ',Exception Type：' + ErrorHander.get_exceptionType() + ',Error Loaction：' + ErrorHander.get_stackTrace();
            alert(ErrorMessage);
        }

        function DownloadFile() {
            PageMethods.DownloadFile($("#txtUrl").val(), $("#txtFileName").val(), function (fileHandle) {

                var task = $("#taskPanel").find(".task:last");
                if (fileHandle > 1) {
                    $(task).clone().appendTo($("#taskPanel"));
                    task = $("#taskPanel").find(".task:last");
                    $(task).find(".taskId").attr("innerHTML", fileHandle);
                    $(task).find(".file").attr("innerHTML", "file");
                    $(task).find(".size").attr("innerHTML", "size");
                    $(task).find(".progress").find("#progressBar").css("width", "5%");
                    $(task).find(".progress").find("#progressLabel").attr("innerHTML", "5%");
                    $(task).find(".status").attr("innerHTML", "status");
                }

                var interval = setInterval(function () {
                    PageMethods.GetFileDownloadProcess(fileHandle, function (result) {
                        $(task).find(".taskId").attr("innerHTML", result.TaskId);
                        $(task).find(".file").attr("innerHTML", result.FileName);
                        $(task).find(".size").attr("innerHTML", result.FileSize);
                        $(task).find(".progress").find("#progressBar").css("width", result.Progress + "%");
                        $(task).find(".progress").find("#progressLabel").attr("innerHTML", result.Progress + "%");
                        $(task).find(".status").attr("innerHTML", result.Status);
                        if (result.Status == 1) {
                            $(task).find(".download").find("a").bind("click", function () {
                                window.open("?path=" + encodeURI(result.FilePath));
                            });
                            clearInterval(interval);
                        }
                    });
                }, 1000);

            });
        }

        function fillFileName() {
            var url = $("#txtUrl").val();
            if (url != "") {
                var fileName = url.substr(url.lastIndexOf('/') + 1);
                $("#txtFileName").val(fileName);
            }
        }
    </script>
    <table cellspacing="0" cellpadding="10">
        <tr>
            <td>
                <table id="downloadPanel" cellspacing="1" cellpadding="5" width="600px">
                    <tr>
                        <td width="100px">Url:</td>
                        <td width="400px">
                            <textarea id="txtUrl" cols="0" rows="5" style="width:400px;margin:5px;text-align:left;vertical-align:top;" onchange="fillFileName()">https://download.alipay.com/sec/edit/aliedit.exe</textarea>
                        </td>
                        <td width="100" valign="bottom" align="center" rowspan="2">
                            <input type="button" value="download" runat="server" id="btnDownload" onclick="DownloadFile()" />
                        </td>
                    </tr>
                    <tr>
                        <td>File Name:</td>
                        <td><input style="width:400px;" type="text" id="txtFileName" size="25" value="aliedit.exe" /></td>
                    </tr>
                </table>
            </td>
        </tr>
        <tr>
            <td>&nbsp;</td>
        </tr>
        <tr>
            <td>
                <table id="taskPanel" style="background-color:gray" cellpadding="5" cellspacing="1">
                    <tr>
                        <td style="width:100px;text-align:center;">TaskID</td>
                        <td style="width:100px;text-align:left;">File</td>
                        <td style="width:100px;text-align:left;">Size</td>
                        <td style="width:200px;text-align:left;">Progress</td>
                        <td style="width:100px;text-align:left;">Status</td>
                        <td style="width:100px;text-align:left;">Download</td>
                    </tr>
                    <tr class="task">
                        <td style="width:100px;text-align:center;" class="taskId">&nbsp;</td>
                        <td style="width:100px;text-align:left;"  class="file">&nbsp;</td>
                        <td style="width:100px;text-align:left;" class="size">&nbsp;</td>
                        <td style="width:200px;text-align:left;" class="progress">
                            <table cellpadding="0" cellspacing="0">
                                <tr>
                                    <td style="width:175px;">
                                        <div style="height:10px;width:173px;border:1px solid gray;margin:0px;padding:0px;">
                                            <div id="progressBar" style="height:100%;width:0%;margin:0px;padding:0px;background-color:Gray;"></div>
                                        </div>    
                                    </td>
                                    <td style="width:25px;text-align:center;" id="progressLabel">
                                        0%
                                    </td>
                                </tr>
                            </table>
                            
                        </td>
                        <td style="width:100px;text-align:left;" class="status">&nbsp;</td>
                        <td style="width:100px;text-align:left;" class="download"><a href="#">download</a></td>
                    </tr>
                </table>
            </td>
        </tr>
    </table>
    </form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.IO;
using System.Threading;
using System.Configuration;

namespace DownloadProxy
{
    public class Task
    {
        public int TaskId { get; set; }
        public string Url { get; set; }
        public string FilePath { get; set; }
        public string FileName 
        {
            get
            {
                return new FileInfo(FilePath).Name;
            }
        }
        public long FileSize { get; set; }
        public int Progress { get; set; }
        public int Status { get; set; }
    }

    public partial class RenameDownload : System.Web.UI.Page
    {
        public static Dictionary<int,Task> FilesDownloadProcess { get; set; }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(Request.QueryString["path"]))
            {
                var path = Request.QueryString["path"];
                if (!System.IO.File.Exists(path))
                {
                    Response.End();
                    return;
                }
                OutPutFile(path);
            }

            if (!IsPostBack)
            {
                FilesDownloadProcess = new Dictionary<int, Task>();
            }
        }
        
        [System.Web.Services.WebMethod]
        public static int DownloadFile(String remoteFilename, String localFilename)
        {
            var fileHand = FilesDownloadProcess.Count + 1;
            var baseFileName = string.Empty;
            var fileExtension = string.Empty;
            var downloadPath = ConfigurationManager.AppSettings["downloadPath"];
            if (localFilename.Trim() == string.Empty)
            {
                baseFileName = "001";
                fileExtension = "";
            }
            else
            {
                try
                {
                    var fileInfo = new FileInfo(localFilename);
                    fileExtension = fileInfo.Extension;
                    baseFileName = fileInfo.Name.Substring(0, fileInfo.Name.Length - fileExtension.Length);
                }
                catch (Exception)
                {
                    //throw;
                }
            }

            var filePath = string.Format(@"{0}\{1}", downloadPath, localFilename);
            for (var i = 1; System.IO.File.Exists(filePath); i++)
            {
                filePath = string.Format(@"{0}\{1}({2}){3}", downloadPath, baseFileName, i, fileExtension);
            }
            localFilename = filePath;

            var task = new Task
            {
                TaskId = fileHand ,
                Url = remoteFilename ,
                FilePath = localFilename , 
                FileSize = 0 ,
                Progress = 0 ,
                Status = 0
            };

            FilesDownloadProcess.Add(task.TaskId, task);

            var thread = new Thread(new ThreadStart(delegate() 
                {
                    DownloadFileProc(task.Url, task.FilePath, task.TaskId);
                }));
            thread.Start();

            return fileHand;
        }

        public static long DownloadFileProc(String remoteFilename, String localFilename,int taskId)
        {
            long bytesProcessed = 0;

            Stream remoteStream = null;
            Stream localStream = null;
            WebResponse response = null;

            try
            {
                // Create a request for the specified remote file name
                var request = (HttpWebRequest)WebRequest.Create(remoteFilename);
                request.AllowWriteStreamBuffering = true;
                request.Credentials = System.Net.CredentialCache.DefaultCredentials;
                request.Proxy = new WebProxy { UseDefaultCredentials = true };
                request.MaximumResponseHeadersLength = -1;
                request.Accept = "www/source, text/html, video/mpeg, image/jpeg, image/x-tiff, image/x-rgb, image/x-xbm, image/gif, application/postscript, application/x-gzip, */*, ";
                request.AllowAutoRedirect = true;
                request.UserAgent = "TLE Retriever v1.5.8";
                request.ContentType = "application/x-www-form-urlencoded";
                request.Method = "GET";
                request.Headers.Add("Accept-Language", "zh-cn");
                request.Headers.Add("Accept-Encoding", "gzip,deflate");
                request.KeepAlive = true;
                if (request != null)
                {
                    response = request.GetResponse();
                    FilesDownloadProcess[taskId].FileSize = response.ContentLength;

                    if (response != null)
                    {
                        remoteStream = response.GetResponseStream();

                        // Create the local file
                        localStream = File.Create(localFilename);

                        // Allocate a 1k buffer
                        byte[] buffer = new byte[1024];
                        int bytesRead;

                        // Simple do/while loop to read from stream until
                        // no bytes are returned
                        do
                        {
                            // Read data (up to 1k) from the stream
                            bytesRead = remoteStream.Read(buffer, 0, buffer.Length);

                            // Write the data to the local file
                            localStream.Write(buffer, 0, bytesRead);

                            // Increment total bytes processed
                            bytesProcessed += bytesRead;

                            FilesDownloadProcess[taskId].Progress = (int)(((double)bytesProcessed / (double)FilesDownloadProcess[taskId].FileSize) * 100);

                            if (FilesDownloadProcess[taskId].Progress >= 100)
                            {
                                FilesDownloadProcess[taskId].Status = 1;
                            }

                        } while (bytesRead > 0);
                    }
                }
            }
            catch
            {
                //throw;
            }
            finally
            {
                if (response != null) response.Close();
                if (remoteStream != null) remoteStream.Close();
                if (localStream != null) localStream.Close();
            }

            // Return total bytes processed to caller.
            return bytesProcessed;
        }

        public void OutPutFile(string filePath)
        {
            System.IO.Stream iStream = null;

            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10000];

            // Length of the file:
            int length;

            // Total bytes to read:
            long dataToRead;

            // 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);


                // Total bytes to read:
                dataToRead = iStream.Length;

                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);

                // 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, 10000);

                        // 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[10000];
                        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();
                }
            }

        }

        [System.Web.Services.WebMethod]
        public static Task GetFileDownloadProcess(int fileHandle)
        {
            return FilesDownloadProcess[fileHandle];
        }
    }
}

 

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