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asp.net 多个文件同时下载

1、首先读取文件夹下的文件,可能同时存在多个文件

2、选中文件,然后点击下载,同时可以选择多个文件。

思路:通过生产压缩包的形式进行下载,然后再清楚压缩包,这样用户可以一次性全部下载下来。

一、获取目录下的所有文件,然后绑定到checkboxlist中 ,代码如下:

 ckl_ck.Items.Clear();        DirectoryInfo TheFolder = new DirectoryInfo(Server.MapPath("Resource/Help"));        //遍历文件夹下的文件        foreach (FileInfo NextFile in TheFolder.GetFiles())            this.ckl_ck.Items.Add(NextFile.Name);

二、选中文件后,点击下载按钮。代码:

 protected void Btn_down_Click(object sender, EventArgs e)    {        if (ckl_ck.Items.Count > 0)        {            List<string> listFJ = new List<string>();//保存附件路径            List<string> listFJName = new List<string>();//保存附件名字            for (int i = 0; i < ckl_ck.Items.Count; i++)            {                if (ckl_ck.Items[i].Selected)                {                    listFJ.Add(Server.MapPath("Resource/Help/") + ckl_ck.Items[i].Text);                    listFJName.Add(ckl_ck.Items[i].Text);                }            }            string time = DateTime.Now.Ticks.ToString();            ZipFileMain(listFJ.ToArray(), listFJName.ToArray(), Server.MapPath("Resource/Help/" + time + ".zip"), 9);//压缩文件            DownloadFile(Server.UrlEncode("附件.zip"), Server.MapPath("Resource/Help/" + time + ".zip"));//下载文件        }    }    private void DownloadFile(string fileName, string filePath)    {        FileInfo fileInfo = new FileInfo(filePath);        Response.Clear();        Response.ClearContent();        Response.ClearHeaders();        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);        Response.AddHeader("Content-Length", fileInfo.Length.ToString());        Response.AddHeader("Content-Transfer-Encoding", "binary");        Response.ContentType = "application/octet-stream";        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");        Response.WriteFile(fileInfo.FullName);        Response.Flush();        File.Delete(filePath);//删除已下载文件        Response.End();    }    /// <summary>    /// 压缩文件    /// </summary>    /// <param name="fileName">要压缩的所有文件(完全路径)</param>    /// <param name="fileName">文件名称</param>    /// <param name="name">压缩后文件路径</param>    /// <param name="Level">压缩级别</param>    public void ZipFileMain(string[] filenames, string[] fileName, string name, int Level)    {        ZipOutputStream s = new ZipOutputStream(File.Create(name));        Crc32 crc = new Crc32();        //压缩级别        s.SetLevel(Level); // 0 - store only to 9 - means best compression        try        {            int m = 0;            foreach (string file in filenames)            {                //打开压缩文件                FileStream fs = File.OpenRead(file);//文件地址                byte[] buffer = new byte[fs.Length];                fs.Read(buffer, 0, buffer.Length);                //建立压缩实体                ZipEntry entry = new ZipEntry(fileName[m].ToString());//原文件名                //时间                entry.DateTime = DateTime.Now;                //空间大小                entry.Size = fs.Length;                fs.Close();                crc.Reset();                crc.Update(buffer);                entry.Crc = crc.Value;                s.PutNextEntry(entry);                s.Write(buffer, 0, buffer.Length);                m++;            }        }        catch        {            throw;        }        finally        {            s.Finish();            s.Close();        }    }

三、系统中需要引用的dll http://download.csdn.net/detail/njxiaogui/8251031 需要下载。

四、运行效果如图:

asp.net 多个文件同时下载