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

代码如下:

//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

代码如下:

///

/// 生成RAR文件

///

/// 存放复制文件的目录

/// RAR文件存放目录

/// RAR文件名

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

代码如下:

///

/// 下载生成的RAR文件

///

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

代码如下:

///

/// 删除临时目录下的所有文件

///

/// 临时目录路径

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;

}

}