本文實例講述了ASP.NET批量下載文件的方法。分享給大家供大家參考。具體方法如下:
一、實現步驟
在用戶操作界面,由用戶選擇需要下載的文件,系統根據所選文件,在服務器上創建用於存儲所選文件的臨時文件夾,將所選文件拷貝至臨時文件夾。然後調用 RAR程序,對臨時文件夾進行壓縮,然後輸出到客戶端。最後刪除臨時文件夾。
二、代碼實現
1、ASP.NET批量下載 核心代碼
復制代碼 代碼如下://遍歷服務器指定文件夾下的所有文件
string path = "uploads/Image/";
string serverPath = Server.MapPath(path);
//創建臨時文件夾
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("圖片拷貝成功!");
//產生RAR文件,及文件輸出
RARSave(tempFolder, tempName);
DownloadRAR(tempFolder + "\\\\" + tempName + ".rar");
2、RARSave(string tempFolder, string tempName) 方法
復制代碼 代碼如下:/// <summary>
/// 生成RAR文件
/// </summary>
/// <param name="path">存放復制文件的目錄</param>
/// <param name="rarPatch">RAR文件存放目錄</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;
//打包文件存放目錄
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
復制代碼 代碼如下:/// <summary>
/// 下載生成的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("\\\\"));
//刪除臨時目錄下的所有文件
DeleteFiles(tempPath);
//刪除空目錄
Directory.Delete(tempPath);
Response.End();
}
4、DeleteFiles(string tempPath) 方法
復制代碼 代碼如下:/// <summary>
/// 刪除臨時目錄下的所有文件
/// </summary>
/// <param name="tempPath">臨時目錄路徑</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;
}
}
希望本文所述對大家的asp.net#程序設計有所幫助。