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125 lines
4.6 KiB
125 lines
4.6 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Text;
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#region histroy
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///程式代號：OpenFile
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///程式名稱：檔案下載
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///程式說明：
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///xx.YYYY/MM/DD VER AUTHOR COMMENTS(說明修改的內容)
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///01.2012/05/10 1.0 Ethan CREATE
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#endregion
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namespace OT.Web
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{
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public partial class OpenFile : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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// 在這裡放置使用者程式碼以初始化網頁
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Response.Expires = 0;
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FnOpenFile();
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}
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private void FnOpenFile()
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{
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try
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{
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//防止在IE中直接開啟本程式操作檔案
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if (Request["U"] == null && Session["U"] == null)
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{
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WriteMsg("非法登入，不可操作檔案！");
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}
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//重定向後開啟檔案
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else if (Session["U"] != null)
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{
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string strFileName = Session["U"].ToString();
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Session.Remove("U");//及時釋放Session
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this.ReadFile(strFileName);
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}
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//遠端呼叫本程式時帶入參數檔案名稱U，為防止User看到U的內容，進行一次重定向
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else if (Request["U"] != null)
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{
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string strFileName = Request.QueryString["U"].ToString();
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strFileName = FnHidToFileName(strFileName).Replace("\\", "/");
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//Session["U"] = strFileName;//用Session記錄U做重定向動作
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//Session["FileName"] = Request.QueryString["FileName"].ToString();
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//Response.Redirect(@"OpenFile.aspx", false);
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this.ReadFile(strFileName);
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}
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}
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catch (Exception ex)
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{
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Session.Remove("U");//及時釋放Session
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this.WriteMsg("開啟檔案出錯，請重新試一次！");
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}
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}
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/// <summary>
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/// 將用於URL中傳參的Base64碼轉為String，轉換前將Base64碼中用*和@替換的＋和/還原
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/// </summary>
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/// <param name="strFrom"></param>
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/// <returns></returns>
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public string FnHidToFileName(string strFrom)
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{
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string strTo = strFrom.Replace("*", "+").Replace("@", "/").Replace("!", "=");
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strTo = FnBase64ToString(strTo);
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return strTo;
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}
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/// <summary>
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/// 將Base64碼轉為String
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/// </summary>
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/// <param name="strFrom"></param>
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/// <returns></returns>
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public string FnBase64ToString(string strFrom)
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{
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byte[] byTo = Convert.FromBase64String(strFrom);
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string strTo = System.Text.Encoding.Default.GetString(byTo);
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return strTo;
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}
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/// <summary>
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/// 開啟檔案
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/// </summary>
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/// <param name="strFileName"></param>
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private void ReadFile(string strFileName)
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{
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string strDownFileName = UTF_FileName(Request.QueryString["FileName"].ToString());
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strDownFileName = HttpUtility.UrlEncode(strDownFileName, System.Text.Encoding.UTF8); //解決中文問題
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Response.ContentType = "application/octet-stream";
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Response.AddHeader("Content-Disposition"
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, String.Format("attachment; filename=\"{0}\";", strDownFileName));
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//Response.Write("**" + fileName);
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Response.WriteFile(UTF_FileName(strFileName));
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try
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{
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Response.End(); //如果提前結束會出現異常。
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}
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catch (Exception ex) { return; }
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}
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private static string UTF_FileName(string filename)
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{
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return HttpUtility.UrlDecode(filename);
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//return HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8);
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}
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/// <summary>
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/// Alert訊息並關閉畫面
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/// </summary>
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/// <param name="Msg">alert出來的訊息內容</param>
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private void WriteMsg(string Msg)
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{
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StringBuilder sbScript = new StringBuilder();
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sbScript.Append("<script language='javascript'>");
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sbScript.Append("ShowArtAlert('" + Msg + "');");
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sbScript.Append("window.opener=null;window.open('','_self');window.close();");
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sbScript.Append("</script>");
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this.ClientScript.RegisterStartupScript(GetType(), "close", sbScript.ToString());
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}
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}
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}
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