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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