IP限制访问量

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 private void ValidIPRequest()
    {
        string ip = "";
        string temptime = "";
        string time = "";

        try
        {
            ip = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];//使用代理服务器时,透过代理获得客户机真实IP

            if (ip == null)
            {
                ip = Request.ServerVariables["REMOTE_ADDR"];//当不采用代理时,直接获得客户机IP
            }

            time = DateTime.Now.ToString("yyyy-MM-dd");//此IP访问时的服务器时间

            SqlDBManager db = new SqlDBManager(System.Configuration.ConfigurationSettings.AppSettings["ConnString"].ToString());

            System.Data.SqlClient.SqlDataReader sdr = db.Select("select top 1 _time from ipday order by _time desc");

            try
            {
                if (sdr.HasRows)
                {
                    while (sdr.Read())
                    {
                        temptime = Convert.ToString(sdr.GetDateTime(0));
                    }
                }
            }
            finally
            {
                sdr.Close();
                db.ConnClose();
            }

            if (temptime == null || temptime == "")
            {
                temptime = time;
            }

            DateTime dt = Convert.ToDateTime(time);//转换当前服务器时间 为时间型
            DateTime tempdt = Convert.ToDateTime(temptime);//转换当前IP数据时间 为时间型

            if (dt == tempdt)  //服务器时间与IP数据时间相同 说明是当天的点击
            {
                IPRequest();
            }
            if (dt > tempdt) //服务器时间>IP数据时间 说明是第二天的点击 获得前一天的点击总数存入iprecord表 并删除ipday中前一天的所有记录
            {
                int topnum = 0;
                System.Data.SqlClient.SqlDataReader sdr1 = db.Select("select sum(num) from ipday");
                try
                {
                    if (sdr1.HasRows)
                    {
                        while (sdr1.Read())
                        {
                            topnum = sdr1.GetInt32(0);
                        }
                    }
                }
                finally
                {
                    sdr1.Close();
                    db.ConnClose();
                }

                db.Delete("delete from ipday where _time='" + temptime + "'");
                db.Insert("insert into iprecord(_time,topnum) values ('" + temptime + "'," + topnum + ")");

                IPRequest();
            }
        }
        catch (Exception ex)
        {
            throw (ex);
        }
    }

    private void IPRequest()
    {
        bool b = db.CheckEnable("ip", ip, "ipday");//检验此IP 今天是否访问过 表中存在为false 不存在为true

        if (b == false)    //此IP今天访问过
        {
            int n = Convert.ToInt32(db.AnyKey("num", "ip", ip, "ipday"));//获得此IP 今天的访问次数
            if (n == 3)
            {
                Response.Write("<script>alert('你已经点了3次了,一天只能点3次');</script>");
                return;
            }
            else if (n < 3)
            {
                n++;
                db.Update("update ipday set num=" + n);
                Response.Write("<script language=javascript>window.open('目标页.aspx');</script>");
            }
        }
        else  //此IP今天没有访问过
        {
            db.Insert("insert into ipday(ip,_time,num) values ('" + ip + "','" + time + "',1)");
            Response.Write("<script language=javascript>window.open('目标页.aspx');</script>");
        }
    }

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