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本文實例講述了asp.net網站防惡意刷新的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。具體實現方法如下：

Session版實現方法：

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();

}

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