ASP.NET批量下载文件的方法

这篇文章主要介绍了ASP.NET批量下载文件的方法,实例汇总了常见的asp.net实现批量下载的方法,具有一定的实用价值,需要的朋友可以参考下

本文实例讲述了ASP.NET批量下载文件的方法。分享给大家供大家参考。具体方法如下：

一、实现步骤

在用户操作界面，由用户选择需要下载的文件，系统根据所选文件，在服务器上创建用于存储所选文件的临时文件夹，将所选文件拷贝至临时文件夹。然后调用 RAR程序，对临时文件夹进行压缩，然后输出到客户端。最后删除临时文件夹。
 
二、代码实现 

1、ASP.NET批量下载 核心代码 

      //批量下载
        protected void Button1_Click(object sender, EventArgs e)
        {
            //遍历服务器指定文件夹下的所有文件
            string path = "Uploads/";
            string serverPath = Server.MapPath(path);
            //临时文件夹名称
            string tempName = DateTime.Now.ToString("yyyyMMddHHmmssffff");
            //将两个字符串组合成一个路径
            string tempFolder = Path.Combine(serverPath, tempName);
            //创建临时文件夹
            if (!Directory.Exists(tempFolder))  //如果不存在路径
            {
                Directory.CreateDirectory(tempFolder);     //创建路径
            }
            DirectoryInfo folder = new DirectoryInfo(serverPath);
            foreach (FileInfo file in folder.GetFiles())
            {
                //文件原名(文件名后面带上传时间)
                string fileName = file.Name;
                //把文件拷贝到相应的文件夹里
                File.Copy(serverPath + "/" + fileName, tempFolder + "/" + fileName);
                //FileInfo newFile = new FileInfo(serverPath + "/" + fileName);
                //newFile.CopyTo(tempFolder + "/" + fileName);
 
                //文件新名字(去掉文件名后面的上传时间)
                string newfileName = fileName.Substring(0, fileName.LastIndexOf("_"));     
                //给文件新名字加后缀名
                newfileName += fileName.Substring(fileName.LastIndexOf('.'), fileName.Length - fileName.LastIndexOf('.'));
                
                //拷贝完成后,还要对临时文件夹里的文件进行重命名
                File.Move(tempFolder + "/" + fileName, tempFolder + "/" + newfileName);
                //FileInfo tempFile = new FileInfo(tempFolder + "/" + fileName);
                //tempFile.MoveTo(Path.Combine(tempFolder, fileName));
            }
            //生成RAR压缩文件
            RARSave(tempFolder, tempName);
            //下载生成的RAR文件
            DownloadRAR(tempFolder + "\\" + tempName + ".rar");
        }
 
        /// <summary>
        /// 生成RAR压缩文件
        /// </summary>
        /// <param name="rarPatch">RAR文件存放目录</param>
        /// <param name="rarName">RAR文件名</param>
        private void RARSave(string rarPatch, string rarName)
        {
            string the_rar;
            RegistryKey the_Reg;
            Object the_Obj;
            string the_Info;
            ProcessStartInfo the_StartInfo;
            Process the_Process;
            try
            {
                the_Reg = Registry.ClassesRoot.OpenSubKey(@"WinRAR");
                the_Obj = the_Reg.GetValue("");
                the_rar = the_Obj.ToString();
                the_Reg.Close();
                the_rar = the_rar.Substring(1, the_rar.Length - 7);
                the_Info = " a " + rarName + " -r";
                the_StartInfo = new ProcessStartInfo();
                the_StartInfo.FileName = "WinRar";//the_rar;
                the_StartInfo.Arguments = the_Info;
                the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                //打包文件存放目录
                the_StartInfo.WorkingDirectory = rarPatch;
                the_Process = new Process();
                the_Process.StartInfo = the_StartInfo;
                the_Process.Start();
                the_Process.WaitForExit();
                the_Process.Close();
            }
            catch (Exception)
            {
                throw;
            }
        }
 
        /// <summary>
        /// 下载生成的RAR文件
        /// </summary>
        private void DownloadRAR(string file)
        {
            FileInfo fileInfo = new FileInfo(file);
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);
            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();
            string tempPath = file.Substring(0, file.LastIndexOf("\\"));
            //删除临时目录及其下的所有文件
            DeleteFiles(tempPath);          
            Response.End();
        }
 
        /// <summary>
        /// 删除临时目录及其下的所有文件
        /// </summary>
        /// <param name="tempPath">临时目录路径</param>
        private void DeleteFiles(string tempPath)
        {
            //验证文件存储的路径是否存在                   
            if (Directory.Exists(tempPath))  //如果存在路径
            {              
                //适用于空文件夹或里面有子目录，文件的文件夹  
                //Directory.Delete(tempPath, true);    //删除路径
                DirectoryInfo di = new DirectoryInfo(tempPath);
                di.Delete(true);
                //删除空目录
                //Directory.Delete(tempPath);
            }
        }