Rails：通过IP地址确定城市

一、对于Rails而言，主流方式应该是使用google库的插件geoip

github地址： https://github.com/simplificator/geoip

require 'geoip'
GeoIP.new('GeoLiteCity.dat').country('www.atlantis.sk')
=> ["www.atlantis.sk", "217.67.18.26", "SK", "SVK", "Slovakia", "EU", "02", "Bratislava", "", 48.15, 17.1167, nil, nil, "Europe/Bratislava"]

Returned values are the requested hostname, the IP address as a dotted quad,
Maxmind's country code, the ISO3166-1 country code, the ISO3166-2 country code,
the ISO3166 country name, and the continent code.

GeoIP.new('GeoCity.dat').city('github.com')
=> ["github.com", "207.97.227.239", "US", "USA", "United States", "NA", "CA", "San Francisco", "94110", 37.7484, -122.4156, 807, 415, "America/Los_Angeles"]

Returned values are the country values followed by region or state name,
city name, postal_code/zipcode, latitude, longitude, USA DMA code, USA area code,
timezone name. Sorry it's not a Hash... historical.

GeoIP.new('GeoIPASNum.dat').asn("www.fsb.ru")
=> ["AS8342", "RTComm.RU Autonomous System"]

二、另一个geo_ip

使用之前需要在http://ipinfodb.com/ 注册一个用户，激活时可以获得自己的key。需要用自己的key来访问该网站的接口。

github地址： https://github.com/jeroenj/geo_ip

# 209.85.227.104 = google.be (US)
GeoIp.geolocation('209.85.227.104')
#returns:

{
:status           =>"OK",
:ip               =>"209.85.227.104"
:country_code     =>"US",
:country_name     =>"United States",
:region_code      =>"06",
:region_name      =>"California",
:city             =>"Mountain View",
:zip_postal_code  =>"94043",
:latitude         =>"37.4192",
:longitude        =>"-122.057"
}

geokit（http://geokit.rubyforge.org/）是一个关于地理的工具，比如根据经纬度确定城市和距离之类，可以结合geo_ip做地理分析

#Find near latitude and longitude:
Store.find(:all, :origin =>[37.792,-122.393], :within=>10)
#Find near an address:
Store.find(:all, :origin=>'100 Spear st, San Francisco, CA', :within=>10)
#Order by distance from the center of a zipcode:
Store.find(:all, :origin=>'94117', :within=>10,
:order=>'distance asc')
#Combine distance conditions with regular conditions
Store.find(:all, :origin=>'94117', :within=>10,
:conditions=>{:store_type=>'CAFE'})

三、过网络的IP查询API

这个办法IP库更新比较快。通用的库有几个比如google。
xml处理页面完全可以通过nokogiri等专门处理工具代替。
提供IP地址查询的API很多比如网易：

1.http://www.youdao.com/smartresult-xml/search.s?type=ip&q=IP地址

2. http://ip2loc.appspot.com/ #含有详细实例讲解， 但是由于GWF地址可能解析不到

3. 新浪的IP地址查询接口：http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js
4. 新浪多地域测试方法：http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=218.192.3.42
#这个比较全，但是有个别ip解析的不对，打个数据库没有更新吧。。。。
5. 搜狐IP地址查询接口（默认GBK）：http://pv.sohu.com/cityjson
6. 搜狐IP地址查询接口（可设置编码）：http://pv.sohu.com/cityjson?ie=utf-8
7. 搜狐另外的IP地址查询接口：http://txt.go.sohu.com/ip/soip

示例：

require "open-uri"
require 'rubygems'
require 'json'
#如果有GET请求参数直接写在URI地址中
uri = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=218.192.3.42'
response = nil
open(uri) do |http|
response = http.read
end

#response = Iconv.conv( "gb2312", "utf-8", response)
@res = JSON::parse(response)
p @res

参考：/article/3770210.html