本文實例講述了asp.net網(wǎng)站防惡意刷新的Cookies與Session解決方法，是WEB程序設計中非常實用的技巧。分享給大家供大家參考。具體實現(xiàn)方法如下：
Session版實現(xiàn)方法：
public double time;
public const int freetime = 1;//防刷冰凍時間間隔,當前為1秒
#region 防惡意刷新
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'為了保證您的訪問安全,請您 " + freetime + " 秒后<a href='" + Request.RawUrl + "' target='_self' style='color:#FF0000;'>點擊這里刷新</a>此頁面</td>");
Response.Write(" </tr>");
Response.Write("</table>");
Response.End();
}
Cookies版實現(xiàn)方法：
public double time;
public const int freetime = 2;
#region 防惡意刷新
string page;
if (Request.Cookies["page"] == null)
{
page = "";
}
else
{
page = HttpContext.Current.Request.Cookies["page"].Value.ToString(); //獲取cookie中存儲的url值
}
string strThisPage = HttpContext.Current.Request.Url.PathAndQuery.ToString();//獲取當前頁地址
DateTime LastTime = DateTime.Now;
if (page.Equals(strThisPage))//如果cookie中的值和當前頁相等，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
{
//執(zhí)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'為了保證您的訪問安全,頁面將在2秒后將自動跳轉到您要訪問的內容！</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();
}