根据IP定位地理位置

参考http://bbs.csdn.net/topics/390336760

出处 http://blog.sina.com.cn/s/blog_49b6b5590100kkxr.html

网上实现IP定位地理位置的技术大部分是PHP和Java，.NET的我找了好久还是还没找到。黄某于是不自量力，经过几个小时的找资料，写代码，终于皇天不负有心人，基于.net的IP定位地理位置的网页实现了，如有同志有兴趣，不妨看看，最还能提些意见，感激不尽！

1.准备工作：
要下载的东西是MaxMind的免费GeoLiteCity数据库和C# API。地址www.maxmind.com如下图：









二进制数据可下载完成后，解压GeoLiteCity.dat就可以了。
然后在VS2008中新建一个网站和一个类库，给网站添加Bin文件夹.
把下载下来的GeoIP-CSharp-1_2.zip解压出来，把将CS文件添加到类库中。其中有几个以Example结尾的文件不用加。不然重新生成会报错。然后将生成的dll文件添加到bin文件夹中。
这样准备工作就完成了。

2.Ip地址搜索页面的生成
用于往地图页面“传输”数据。
前台页面只要这句话就够了：
<%@ Page Language="C#" CodeFile="SearchIP.aspx.cs" Inherits="SearchIP"%>
不然地图页面调用eval（data）；会出错；

后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.Data;
using System.Configuration;
using System.Net;

public partial class SearchIP : System.Web.UI.Page
{
 

   stringIP="";
    stringDomain="";
    protectedvoid Page_Load(object sender, EventArgs e)
    {
       try
       {

           if (Request.QueryString.Count != 0)
               Domain = Request.QueryString["q"].ToString();
           if (Domain == "")
           {
               IP = IPAddress;
               if (IP == "" || IP.Equals(null))
               {
                   Response.Write("<script>alert(找不到IP地址！');</script>");
                   return;
               }
           }
           else
           {
               if (!IsIPAddress(Domain))
               {
                   IP = GetIPByDomain(Domain);
                   if (!IsIPAddress(IP))
                   {
                       Response.Write("<script>alert('找不到IP地址！');</script>");
                       return;
                   }
               }
               else
                   IP = Domain;
           }
           
       }
       catch (Exception e1)
       {
           Response.Write("<script>alert('出错了！');</script>");
           return;
       }
         LoadPage();

    }
//获取IP地址
    publicstatic string IPAddress
    {
       get
       {
           string result = String.Empty;

           result =HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
           if (result != null && result !=String.Empty)
           {
               //可能有代理
               if (result.IndexOf(".") ==-1)    //没有“.”肯定是非IPv4格式
                   result = null;
               else
               {
                   if (result.IndexOf(",") != -1)
                   {
                       //有“,”，估计多个代理。取第一个不是内网的IP。
                       result = result.Replace(" ", "").Replace("'", "");
                       string[] temparyip = result.Split(",;".ToCharArray());
                       for (int i = 0; i < temparyip.Length; i++)
                       {
                           if (IsIPAddress(temparyip[i])
                               && temparyip[i].Substring(0, 3) !="10."
                               && temparyip[i].Substring(0, 7) !="192.168"
                               && temparyip[i].Substring(0, 7) !="172.16.")
                           {
                               returntemparyip[i];    //找到不是内网的地址
                           }
                       }
                   }
                   else if (IsIPAddress(result))//代理即是IP格式
                       return result;
                   else
                       result =null;    //代理中的内容非IP，取IP
               }

           }

           string IpAddress =(HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]!= null &&HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]!= String.Empty) ?HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]: HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
           //if (IpAddress == "127.0.0.1" || IpAddress=="localhost")
           //    result =Dns.GetHostEntry(Dns.GetHostName()).AddressList[5].ToString();
           using (System.Net.WebClient wc = new System.Net.WebClient())
           {
               result = wc.DownloadString("http://www.zu14.cn/ip/");//用自己的电脑访问http://www.zu14.cn/ip/获取IP地址
           }


           if (null == result || result == String.Empty)
               result =HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

           if (result == null || result == String.Empty)
               result = HttpContext.Current.Request.UserHostAddress;

           return result;
       }
    }

    publicstatic bool IsIPAddress(string str1)//判断是不是IP地址的格式
    {
       if (str1 == null || str1 == string.Empty || str1.Length< 7 || str1.Length > 15) returnfalse;
       string regformat =@"^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}$";
       Regex regex = new Regex(regformat, RegexOptions.IgnoreCase);
       return regex.IsMatch(str1);
    }

    publicstring GetIPByDomain(string url)//根据域名取得IP地址
    {
       if (url.Trim() == string.Empty)
           return "";
       try
       {
           System.Net.IPHostEntry host =System.Net.Dns.GetHostEntry(url);
           return host.AddressList.GetValue(0).ToString();
       }
       catch
       {
           return "";
       }
    }

    public voidLoadPage()
    {
       try
       {
           LookupService ls = newLookupService("C:/Users/hzh-PC/Desktop/GeoLiteCity.dat",LookupService.GEOIP_STANDARD);//使用MaxMind的API
           //get city location of the ip address
           if (IP != null)
           {
               Location l = new Location();
                l = ls.getLocation(IP);
               if (l != null)
               {
                   string fun= "loadGeoInfo("+
                       '"' + Domain + "\"," +
                       '"'+ IP +"\","+
                       '"'+ l.countryCode + "\","+
                       '"'+ l.countryName +"\","+
                       '"'+ l.regionName +"\","+
                       '"' + l.city + "\"," +
                       l.latitude +',' +
                       l.longitude+")";                   
                   Response.Write(fun);
                   
                   
               }
               else
               {                   
                   Response.Write("<script>alert('找不到IP地址!');</script>");
                   return;
               }
           }
           else
           {
               Response.Write("<script>alert('找不到IP地址!!');</script>");
               return;
           }
       }
       catch (Exception e)
       {
           Response.Write("<script>alert('错误：" +e.Message + "');</script>");
       }
    }
}
该页面的默认是获得自己电脑的IP的信息，可以通过SearchIP?q=XXX来获取特定IP或域名的信息。
运行结果：