下载超大文件的控件
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
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;
}
}
详细配置与控件信息可以参考我写的这篇文章：http://blog.ncmem.com/wordpress/2019/08/28/net%E6%96%87%E4%BB%B6%E6%89%B9%E9%87%8F%E4%B8%8B%E8%BD%BD/
