asp.net网站防恶意刷新的Cookies与Session解决方法

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();

}