asp.net 获取客户端浏览器访问的IP地址的实例代码

本文介绍了asp.net 获取客户端浏览器访问的IP地址的实例代码，分享给大家，自己也留个笔记

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"] + ', 城市编码:' + returnCitySN["cid"] + ', 地区:' + returnCitySN["cname"]);
  </script>
</head>
<body>
</body>
</html> 

2、后台代码实现

#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>
   /// 获取远程访问用户的Ip地址
   /// </summary>
   /// <returns>返回Ip地址</returns>
   protected string GetLoginIp()
   {
     string loginip = "";
     //Request.ServerVariables[""]--获取服务变量集合
     if (Request.ServerVariables["REMOTE_ADDR"] != null) //判断发出请求的远程主机的ip地址是否为空
     {
       //获取发出请求的远程主机的Ip地址
       loginip = Request.ServerVariables["REMOTE_ADDR"].ToString();
     }
     //判断登记用户是否使用设置代理
     else if (Request.ServerVariables["HTTP_VIA"] != null)
     {
       if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
       {
         //获取代理的服务器Ip地址
         loginip = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
       }
       else
       {
         //获取客户端IP
         loginip = Request.UserHostAddress;
       }
     }
     else
     {
       //获取客户端IP
       loginip = Request.UserHostAddress;
     }
     return loginip;
   } 

   /// <summary>
   /// 根据IP获取省市
   /// </summary>
   public string[] GetAddressByIp(string ip)
   {
     string PostUrl = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=" + ip;
     string res = GetDataByPost(PostUrl);//该条请求返回的数据为：res=1t115.193.210.0t115.194.201.255t中国t浙江t杭州t电信
     string[] arr = getAreaInfoList(res);
     return arr;
   } 

   /// <summary>
   /// Post请求数据
   /// </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>
   /// 处理所要的数据
   /// </summary>
   /// <param name="ip"></param>
   /// <returns></returns>
   public static string[] getAreaInfoList(string ipData)
   {
     //1t115.193.210.0t115.194.201.255t中国t浙江t杭州t电信
     string[] areaArr = new string[10];
     string[] newAreaArr = new string[2];
     try
     {
       //取所要的数据，这里只取省市
       areaArr = ipData.Split('t');
       newAreaArr[0] = areaArr[4];//省
       newAreaArr[1] = areaArr[5];//市
     }
     catch (Exception e)
     { 

     }
     return newAreaArr;
   } 

   #endregion 

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