本文实例讲述了asp.net网站防恶意刷新的Cookies与Session解决方法,是WEB程序设计中非常实用的技巧。分享给大家供大家参考。具体实现方法如下:
Session版实现方法:
public double time; public const int freetime = 1;//防刷冰冻时间间隔,当前为1秒 #region 防恶意刷新 if (Session.SessionID == null) { Response.End(); } else if (Session[\"sionid\"] == null) { Session[\"sionid\"] = Session.SessionID; } if (Session[\"last\"] == null) { Session[\"last\"] = DateTime.Now; } else { DateTime thisTime = DateTime.Now; DateTime lastTime = DateTime.Parse(Session[\"last\"].ToString()); if (Session.SessionID == Session[\"sionid\"].ToString()) Session[\"last\"] = thisTime; TimeSpan ts = thisTime - lastTime; time = ts.TotalMilliseconds; if (time < freetime * 500) { warm_prompt(); } } #endregion public void warm_prompt() { Response.Write(\"<table width=\'778\' border=\'0\' align=\'center\' cellpadding=\'3\' cellspacing=\'2\' bgcolor=\'#009900\' style=\'font-size: 14px; \'>\"); Response.Write(\" <tr bgcolor=\'#FFFFFF\'>\"); Response.Write(\" <td><img src=\'/newimages/logos.gif\'></td>\"); Response.Write(\" <td bgcolor=\'#EEFFEE\'为了保证您的访问安全,请您 \" + freetime + \" 秒后<a href=\'\" + Request.RawUrl + \"\' target=\'_self\' style=\'color:#FF0000;\'>点击这里刷新</a>此页面</td>\"); Response.Write(\" </tr>\"); Response.Write(\"</table>\"); Response.End(); }
Cookies版实现方法:
public double time; public const int freetime = 2; #region 防恶意刷新 string page; if (Request.Cookies[\"page\"] == null) { page = \"\"; } else { page = HttpContext.Current.Request.Cookies[\"page\"].Value.ToString(); //获取cookie中存储的url值 } string strThisPage = HttpContext.Current.Request.Url.PathAndQuery.ToString();//获取当前页地址 DateTime LastTime = DateTime.Now; if (page.Equals(strThisPage))//如果cookie中的值和当前页相等,那么表示是刷新操作 { TimeSpan ts = LastTime - DateTime.Parse(HttpContext.Current.Request.Cookies[\"time\"].Value.ToString()); time = ts.Seconds; if (time < freetime) { warm_prompt(); } } else { //执行操作 Response.Cookies[\"page\"].Value = strThisPage; Response.Cookies[\"time\"].Value = LastTime.ToString(); } #endregion public void warm_prompt() { Response.Write(\"<table width=\'778\' border=\'0\' align=\'center\' cellpadding=\'3\' cellspacing=\'2\' bgcolor=\'#009900\' style=\'font-size: 14px; \'>\"); Response.Write(\" <tr bgcolor=\'#FFFFFF\'>\"); Response.Write(\" <td><img src=\'/newimages/logos.gif\'></td>\"); Response.Write(\" <td bgcolor=\'#EEFFEE\'为了保证您的访问安全,页面将在2秒后将自动跳转到您要访问的内容!</td>\"); Response.Write(\" </tr>\"); Response.Write(\"</table>\"); Response.Write(\"<meta http-equiv=\\\"refresh\\\" content=\\\"2\\\";URL=\" + HttpContext.Current.Request.Cookies[\"page\"].Value.ToString() + \">\"); Response.End(); }
相信本文所述对大家的asp.net程序设计有一定的借鉴价值。
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