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();
}

相信本文所述对大家的asp.net程序设计有一定的借鉴价值。