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ASP.NET批量下载文件

时间:2014-7-15类别:编程学习

ASP.NET批量下载文件

ASP.NET批量下载文件

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

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  • 1、ASP.NET批量下载 核心代码
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  • C# 代码   复制
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    //遍历服务器指定文件夹下的所有文件
                string path = "uploads/Image/";
                string serverPath = Server.MapPath(path);
    
                //创建临时文件夹
                string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
                string tempFolder = Path.Combine(serverPath, tempName);
                Directory.CreateDirectory(tempFolder);
    
                DirectoryInfo folder = new DirectoryInfo(serverPath);
                foreach (FileInfo file in folder.GetFiles())
                {
                    string filename = file.Name;
                    File.Copy(serverPath + "/" + filename, tempFolder + "/" + filename);
                }
                //ZKHelper.JSHelper.Alert("图片拷贝成功!");
                //产生RAR文件,及文件输出
                RARSave(tempFolder, tempName);
                DownloadRAR(tempFolder + "\\\\" + tempName + ".rar");
    
    		
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    2、RARSave(string tempFolder, string tempName) 方法

     

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  • C# 代码   复制
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    /// <summary>
            /// 生成RAR文件
            /// </summary>
            /// <param name="path">存放复制文件的目录</param>
            /// <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;
                }
            }
    
    		
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    3、DownloadRAR(string file)方法

     

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  • C# 代码   复制
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    /// <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("\\\\"));
                //删除临时目录下的所有文件
                DeleteFiles(tempPath);
                //删除空目录
                Directory.Delete(tempPath);
                Response.End();
            }
    
    		

  • 4、DeleteFiles(string tempPath) 方法

     

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  • C# 代码   复制
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    /// <summary>
            /// 删除临时目录下的所有文件
            /// </summary>
            /// <param name="tempPath">临时目录路径</param>
            private void DeleteFiles(string tempPath)
            {
                DirectoryInfo directory = new DirectoryInfo(tempPath);
                try
                {
                    foreach (FileInfo file in directory.GetFiles())
                    {
                        if (file.Attributes.ToString().IndexOf("ReadOnly") != -1)
                        {
                            file.Attributes = FileAttributes.Normal;
                        }
                        File.Delete(file.FullName);
                    }
                }
                catch (Exception)
                {
                    throw;
                }
            }
    
    		
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