asp.net 獲取客戶端瀏覽器訪問的IP地址

1、js方法

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <script src="http://pv.sohu.com/cityjson?ie=utf-8"></script> 
    <script type="text/javascript">  
        document.write('IP地址:' + returnCitySN["cip"] + ', 城市編碼:' + returnCitySN["cid"] + ', 地區:' + returnCitySN["cname"]);
    </script>
</head>
<body> 
</body>
</html>

2、後臺代碼實現

  #region IP地址限制功能 2017-07-18


        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public bool IsIPValidate()
        {
            bool flag = false;
            string userip = GetLoginIp();
            string[] addr = GetAddressByIp(userip);
            string addrs = addr[0] + addr[1];
            if ("北京".Equals(addr[0]) || "北京".Equals(addr[1]))
            {
                flag = true;
            }
            return flag;
        }


        /// <summary>
        /// 獲取遠程訪問用戶的Ip地址
        /// </summary>
        /// <returns>返回Ip地址</returns>
        protected string GetLoginIp()
        {
            string loginip = "";
            //Request.ServerVariables[""]--獲取服務變量集合 
            if (Request.ServerVariables["REMOTE_ADDR"] != null) //判斷髮出請求的遠程主機的ip地址是否爲空
            {
                //獲取發出請求的遠程主機的Ip地址
                loginip = Request.ServerVariables["REMOTE_ADDR"].ToString();
            }
            //判斷登記用戶是否使用設置代理
            else if (Request.ServerVariables["HTTP_VIA"] != null)
            {
                if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
                {
                    //獲取代理的服務器Ip地址
                    loginip = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
                }
                else
                {
                    //獲取客戶端IP
                    loginip = Request.UserHostAddress;
                }
            }
            else
            {
                //獲取客戶端IP
                loginip = Request.UserHostAddress;
            }
            return loginip;
        }




        /// <summary>
        /// 根據IP獲取省市
        /// </summary>
        public string[] GetAddressByIp(string ip)
        {
            string PostUrl = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=" + ip;
            string res = GetDataByPost(PostUrl);//該條請求返回的數據爲：res=1t115.193.210.0t115.194.201.255t中國t浙江t杭州t電信
            string[] arr = getAreaInfoList(res);
            return arr;
        }


        /// <summary>
        /// Post請求數據
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public string GetDataByPost(string url)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            string s = "anything";
            byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(s);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = requestBytes.Length;
            Stream requestStream = req.GetRequestStream();
            requestStream.Write(requestBytes, 0, requestBytes.Length);
            requestStream.Close();


            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
            string backstr = sr.ReadToEnd();
            sr.Close();
            res.Close();
            return backstr;
        }


        /// <summary>
        /// 處理所要的數據
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static string[] getAreaInfoList(string ipData)
        {
            //1t115.193.210.0t115.194.201.255t中國t浙江t杭州t電信
            string[] areaArr = new string[10];
            string[] newAreaArr = new string[2];
            try
            {
                //取所要的數據，這裏只取省市
                areaArr = ipData.Split('t');
                newAreaArr[0] = areaArr[4];//省
                newAreaArr[1] = areaArr[5];//市
            }
            catch (Exception e)
            {


            }
            return newAreaArr;
        }


        #endregion