asp.net檔案下載

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 1       protected void btn_Down(object sender, EventArgs e) 2         { 3             string filePath = Server.MapPath("/TradeLog/" + txtDate.Text.Trim()); 4             if (!downBeforeValidation(filePath)) 5                 return; 6             dlZipDir(filePath, txtDate.Text); 7         }     8  9        /// <summary>10         /// 下載前驗證11         /// </summary>12         /// <param name="filePath">檔案路徑</param>13         /// <returns></returns>14         private bool downBeforeValidation(string filePath)15         {16             //判斷密碼是否正確17             string downPassWord = WebConfigurationManager.AppSettings["downPassWord"];18             if (string.IsNullOrEmpty(txtPassWord.Text) || txtPassWord.Text.Trim() != downPassWord)19             {20                 Response.Write("<script>alert(‘密碼錯誤或為空白‘)</script>");21                 return false;22             }23             //判斷檔案是否存在24 25             if (!Directory.Exists(filePath))26             {27                 Response.Write("<script>alert(‘目錄不存在‘)</script>");28                 return false;29             }30             return true;31         }32 33       /// <summary>34         /// 全部變數35         /// </summary>36         ZipOutputStream zos = null;37         String strBaseDir = "";38         /// <summary>39         /// 下載檔案40         /// </summary>41         /// <param name="strPath">路徑</param>42         /// <param name="strFileName">下載後預設顯示檔案名稱</param>43         void dlZipDir(string strPath, string strFileName)44         {45             MemoryStream ms = null;46             Response.ContentType = "application/octet-stream";47             strFileName = HttpUtility.UrlEncode(strFileName).Replace(‘+‘, ‘ ‘);48             Response.AddHeader("Content-Disposition", "attachment;   filename=" + strFileName + ".zip");49             ms = new MemoryStream();50             zos = new ZipOutputStream(ms);51             strBaseDir = strPath + "\\";52             addZipEntry(strBaseDir);53             zos.Finish();54             zos.Close();55             Response.Clear();56             Response.BinaryWrite(ms.ToArray());57             Response.End();58         }59 60      /// <summary>61         /// 產生壓縮檔62         /// </summary>63         /// <param name="PathStr"></param>64         void addZipEntry(string PathStr)65         {66             DirectoryInfo di = new DirectoryInfo(PathStr);67             foreach (DirectoryInfo item in di.GetDirectories())68             {69                 addZipEntry(item.FullName);70             }71             foreach (FileInfo item in di.GetFiles())72             {73                 FileStream fs = File.OpenRead(item.FullName);74                 byte[] buffer = new byte[fs.Length];75                 fs.Read(buffer, 0, buffer.Length);76                 string strEntryName = item.FullName.Replace(strBaseDir, "");77                 ZipEntry entry = new ZipEntry(strEntryName);78                 zos.PutNextEntry(entry);79                 zos.Write(buffer, 0, buffer.Length);80                 fs.Close();81             }82         }