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
C# 代码
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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");
2、RARSave(string tempFolder, string tempName) 方法
C# 代码
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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; } }
3、DownloadRAR(string file)方法
C# 代码
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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
C# 代码
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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; } }