Java-obtain the user's location through IP addresses

Recently, an Internet project needs similar functions like other Internet projects. One of them is to display the current user's location through the IP address of the user accessing the website. Before reading the information, I first thought that there should be such a restful service, which may be free or charged. Later, I consulted the customer service staff and found a pretty good database: geoip.

Chinese official website: http://www.maxmind.com/zh/home? Pkit_lang = ZH

Http://www.maxmind.com/en/home

And geoip also provides such as I guess the function: web services, specific can see here: http://dev.maxmind.com/geoip/legacy/web-services

Here I will move the official instance, Web Services:

First, let's get a Java version:

import java.net.MalformedURLException;import java.net.URL;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.IOException;public class OmniReader {    public static void main(String[] args) throws Exception {        String license_key = "YOUR_LICENSE_KEY";        String ip_address = "24.24.24.24";        String url_str = "http://geoip.maxmind.com/e?l=" + license_key + "&i=" + ip_address;        URL url = new URL(url_str);        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));        String inLine;                while ((inLine = in.readLine()) != null) {            // Alternatively use a CSV parser here.            Pattern p = Pattern.compile("\"([^\"]*)\"|(?<=,|^)([^,]*)(?:,|$)");             Matcher m = p.matcher(inLine);            ArrayList fields = new ArrayList();            String f;            while (m.find()) {                f = m.group(1);                if (f!=null) {                    fields.add(f);                }                else {                    fields.add(m.group(2));                }            }                        String countrycode = fields.get(0);            String countryname = fields.get(1);            String regioncode = fields.get(2);            String regionname = fields.get(3);            String city = fields.get(4);            String lat = fields.get(5);            String lon = fields.get(6);            String metrocode = fields.get(7);            String areacode = fields.get(8);            String timezone = fields.get(9);            String continent = fields.get(10);            String postalcode = fields.get(11);            String isp = fields.get(12);            String org = fields.get(13);            String domain = fields.get(14);            String asnum = fields.get(15);            String netspeed = fields.get(16);            String usertype = fields.get(17);            String accuracyradius = fields.get(18);            String countryconf = fields.get(19);            String cityconf = fields.get(20);            String regionconf = fields.get(21);            String postalconf = fields.get(22);            String error = fields.get(23);        }        in.close();    }}

C # version:

private string GetMaxMindOmniData(string IP) {  System.Uri objUrl = new System.Uri("http://geoip.maxmind.com/e?l=YOUR_LICENSE_KEY&i=" + IP);  System.Net.WebRequest objWebReq;  System.Net.WebResponse objResp;  System.IO.StreamReader sReader;  string strReturn = string.Empty;  try    {      objWebReq = System.Net.WebRequest.Create(objUrl);      objResp = objWebReq.GetResponse();      sReader = new System.IO.StreamReader(objResp.GetResponseStream());      strReturn = sReader.ReadToEnd();      sReader.Close();      objResp.Close();    }  catch (Exception ex)    {    }  finally    {      objWebReq = null;    }  return strReturn;}

Ruby version:

#!/usr/bin/env rubyrequire 'csv'require 'net/http'require 'open-uri'require 'optparse'require 'uri'fields = [:country_code,          :country_name,          :region_code,          :region_name,          :city_name,          :latitude,          :longitude,          :metro_code,          :area_code,          :time_zone,          :continent_code,          :postal_code,          :isp_name,          :organization_name,          :domain,          :as_number,          :netspeed,          :user_type,          :accuracy_radius,          :country_confidence,          :city_confidence,          :region_confidence,          :postal_confidence,          :error]options = { :license => "YOUR_LICENSE_KEY", :ip => "24.24.24.24" }OptionParser.new { |opts|  opts.banner = "Usage: omni-geoip-ws.rb [options]"  opts.on("-l", "--license LICENSE", "MaxMind license key") do |l|    options[:license] = l  end  opts.on("-i", "--ip IPADDRESS", "IP address to look up") do |i|    options[:ip] = i  end}.parse!uri = URI::HTTP.build(:scheme => 'http',                      :host   => 'geoip.maxmind.com',                      :path   => '/e',                      :query  => URI.encode_www_form(:l => options[:license],                                                     :i => options[:ip]))response = Net::HTTP.get_response(uri)unless response.is_a?(Net::HTTPSuccess)  abort "Request failed with status #{response.code}"endomni = Hash[fields.zip(response.body.encode('utf-8', 'iso-8859-1').parse_csv)]if omni[:error]  abort "MaxMind returned an error code for the request: #{omni[:error]}"else  puts  puts "MaxMind Omni data for #{options[:ip]}";  puts  omni.each { |key, val| printf "  %-20s  %s\n", key, val }  putsend

Let's try another Perl version:

#!/usr/bin/env perluse strict;use warnings;use Encode qw( decode );use Getopt::Long;use LWP::UserAgent;use Text::CSV_XS;use URI;use URI::QueryParam;my @fields = qw(    country_code    country_name    region_code    region_name    city_name    latitude    longitude    metro_code    area_code    time_zone    continent_code    postal_code    isp_name    organization_name    domain    as_number    netspeed    user_type    accuracy_radius    country_confidence    city_confidence    region_confidence    postal_confidence    error);my $license_key = 'YOUR_LICENSE_KEY';my $ip_address  = '24.24.24.24';GetOptions(    'license:s' => \$license_key,    'ip:s'      => \$ip_address,);my $uri = URI->new('http://geoip.maxmind.com/e');$uri->query_param( l => $license_key );$uri->query_param( i => $ip_address );my $ua = LWP::UserAgent->new( timeout => 5 );my $response = $ua->get($uri);die 'Request failed with status ' . $response->code()    unless $response->is_success();my $csv = Text::CSV_XS->new( { binary => 1 } );$csv->parse( decode( 'ISO-8859-1', $response->content() ) );my %omni;@omni{@fields} = $csv->fields();binmode STDOUT, ':encoding(UTF-8)';if ( defined $omni{error} && length $omni{error} ) {    die "MaxMind returned an error code for the request: $omni{error}\n";}else {    print "\nMaxMind Omni data for $ip_address\n\n";    for my $field (@fields) {        print sprintf( "  %-20s  %s\n", $field, $omni{$field} );    }    print "\n";}

All of the above are based on Web Services. Here I will write another instance that uses the local library, and the project also uses the local library.

First, you need to add the library file geolitecity to the project, and then you can use this file to obtain the city and country information. I don't need to talk about how to obtain the IP address accessed by users in the project. People who have worked on web development should know it. Request. Java code:

public class GeoBusiness {/** * @param args * @throws IOException */public static void main(String[] args) throws IOException {// TODO Auto-generated method stubSystem.out.println(getLocationByIp("220.181.111.147").getCity());System.out.println(getLocationByIp("220.181.111.147").getCountryName());}public static Location getLocationByIp(String ipaddr) throws IOException {String sep = System.getProperty("file.separator");String dir = Play.configuration.getProperty("geoip.datdir");String dbfile = dir + sep + "GeoLiteCity.dat";LookupService cl = new LookupService(dbfile,LookupService.GEOIP_MEMORY_CACHE);Location location = cl.getLocation(ipaddr);cl.close();return location;}}

For more detailed functions, such as obtaining the province, you can refer to the URL at the top of my list.