NB----NB大牛------请进-----下载大小问题

2012-03-21 02:06:47 212 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

这几天一直折腾下载的一个东西，一直有下载不了大文件的念头闪烁，今天终于深测了下。发现文件大概到了600多M的时候，客户端就没反应了，一直响应着。服务器端日志显示下载完成
下面贴上源码：
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 to download including its path.
string filepath = fileName + ".zip";

// Identify the file name.
string filename = System.IO.Path.GetFileName(filepath);
Logger.Log.Info("文件名："+filename);
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;
Logger.Log.Info("大小：" + dataToRead);
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename="+Server.UrlEncode(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);
Logger.Log.Info("大小length：" + length);
// 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;
}
}
Logger.Log.Info("下载成功！");
}
catch (Exception ex)
{
// Trap the error, if any.
Logger.Log.Info("异常：" + ex.ToString());
//Response.Write("Error : " + ex.Message);
}
finally
{
if (iStream != null)
{
//Close the file.
iStream.Close();
}
}

日志：
INFO ,12-03-21 13:31:20,Page_Load,页面加载中........
INFO ,12-03-21 13:31:20,Page_Load,执行文件打包操作
INFO ,12-03-21 13:31:21,ForeignFileToZIP,执行SP_RPT_GETFILEDOWNLOAD获取文件的信息900
INFO ,12-03-21 13:31:21,ForeignFileToZIP,执行SP_RPT_GetFilesToExcel获取说明文档信息900
INFO ,12-03-21 13:31:21,ForeignFileToZIP,创建文件夹D:\download\外来文件_31868e20-3a43-419d-b6f4-39425736f2d4\外来文件
INFO ,12-03-21 13:31:21,ToExcel,生成说明文档
INFO ,12-03-21 13:31:24,SetExcelTitle,设置说明文档EXCEL的表头
INFO ,12-03-21 13:31:58,ForeignFileToZIP,说明文档生成完成，存放:D:\download\外来文件_31868e20-3a43-419d-b6f4-39425736f2d4\外来文件\外来文件.xls
INFO ,12-03-21 13:31:58,ForeignFileToZIP,读取文件，整理文件存放目录
INFO ,12-03-21 13:32:34,ForeignFileToZIP,压缩文件
INFO ,12-03-21 13:36:02,ForeignFileToZIP,下载成功
INFO ,12-03-21 13:36:02,ForeignFileToZIP,文件名：外来文件.zip
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小：756758941
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:36:02,ForeignFileToZIP,大小length：10000
INFO ,12-03-21 13:45:21,ForeignFileToZIP,下载成功！
INFO ,12-03-21 13:47:49,Application_Start,ASP.global_asax，Application_Start
INFO ,12-03-21 13:47:49,Application_Start,ASP.global_asax，IsCache:true

...全文

（2024，DDPM，DDIM，流匹配，SDE，ODE）扩散：基础教程本文的目标是尽可能简单地教授扩散。第一节介绍扩散的基本原理。第二节和第三节展示如何构建随机和确定性扩散采样器。第四部分介绍了密切相关的流匹配，可看作是扩散的推广。第五节，强调实践中最重要的一些设计选择，包括采样器、噪声时间表和参数化方法。阅读详情

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SomethingJack 2012-03-22

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[Quote=引用 3 楼 dongt1 的回复:]

我前几天问过c#的下载有个大侠告诉我了再我的问题表里面 ==我给你找找哈。。。
[/Quote]

dongt1 2012-03-22

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http://topic.csdn.net/u/20120308/10/0582c285-4cc6-4876-8f90-829fa1caf1f7.html希望对楼主有帮助，，，不行的话楼主再查查。。

dongt1 2012-03-22

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我前几天问过c#的下载有个大侠告诉我了再我的问题表里面 ==我给你找找哈。。。

SomethingJack 2012-03-21

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分块下载.
参考。



using System;

using System.Collections;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Xml.Linq;



namespace Asiastar.NR.Ajax

{

    /// <summary>

    /// $codebehindclassname$ 的摘要说明

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    public class Handler1 : IHttpHandler

    {



        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/plain";



            string id = context.Request["id"].ToString();//获取资源的编号

            System.IO.Stream iStream = null;

            byte[] buffer = new Byte[10000];

            int length;

            long dataToRead;

            NRBLL.File bf = new Asiastar.NRBLL.File();

            Guid guid = new Guid(id);

            if (bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"] != null)//判断数据库路径是否存在		 

            {

                string filepath = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString();//获取资源完整路径				   D:\资源文件\600cc139-14cf-448e-9e50-daa972d35e01.jpg

                string Oidfilename = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FileNam"].ToString();//旧文件名称

                //string filename = System.IO.Path.GetFileName(filepath);//获取文件名称+后缀名			600cc139-14cf-448e-9e50-daa972d35e01.JPG

                //int index = filepath.IndexOf(".");

                //string filetype = filepath.Substring(index).ToLower();//后缀名

                //string newfilename = Oidfilename;

                //string filepath1 = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString().Substring(0,filepath.Length - 8);

                try

                {

                    string fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(Oidfilename));//解码(注意这里2层解码)

                    Oidfilename = Oidfilename.Replace("+", "%20");  //将“+”替换成“空格”

                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);

                    dataToRead = iStream.Length;

                    context.Response.ContentType = "application/octet-stream";

                    context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Oidfilename, System.Text.Encoding.UTF8));  //下载的时候下载原来的文件名称

                    while (dataToRead > 0)

                    {

                        if (context.Response.IsClientConnected)

                        {

                            length = iStream.Read(buffer, 0, 10000);

                            context.Response.OutputStream.Write(buffer, 0, length);

                            context.Response.Flush();

                            buffer = new Byte[10000];

                            dataToRead = dataToRead - length;

                        }

                        else

                        {

                            dataToRead = -1;

                        }

                    }



                }

                catch (Exception ex)

                {

                    NR.Error.Log.LogType(ex.ToString());

                }

                finally

                {

                    if (iStream != null)

                    {

                        iStream.Close();

                    }

                }

            }

            else

            {

                NR.Error.Log.LogType("找不到文件!");

            }

        }

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

}

porschev 2012-03-21

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试试下面的这个。。。

http://www.cnblogs.com/flashlm/archive/2011/12/13/1531091.html

NB----NB大牛------请进-----下载大小问题

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