Obtain geographic location and coordinates according to ip address (offline method)

Acquire geographic location information based on ip, without using http and webservice interfaces, reducing request time.We can take advantage of the GeoLite2 library, the GeoLite2 database is a free IP geolocation database, and the GeoLite2 Country and City database is updated on the first Tuesday of every month.The GeoLite2 ASN database is updated every Tuesday.

Database download: https://dev.maxmind.com/zh-hans/geoip/geoip2/geolite2/#i

java documentation: http://maxmind.github.io/GeoIP2-java/

The following is a tool class demo

1. First place the downloaded file in the resources directory, which uses the city database

2. Tool class writing

/*** ip geographic coordinate acquisition tool class*/public class Geoip2Client {public static Map getGenIp(String ipAddr){Map result = new HashMap<>();try{String dbPath = this.getClass().getClassLoader().getResource("GeoLite2-City.mmdb").getPath();// This is the location of the GeoIP2 or GeoLite2 database file, which is obtained from the project resources path, of course, it can also be written as an absolute pathFile database = new File(dbPath);DatabaseReader reader = new DatabaseReader.Builder(database).withCache(new CHMCache()).build();InetAddress ipAddress = InetAddress.getByName(ipAddr);CityResponse response = reader.city(ipAddress);Country country = response.getCountry();Subdivision subdivision = response.getMostSpecificSubdivision();City city = response.getCity();Location location = response.getLocation();result.put("lat",location.getLatitude());//Latituderesult.put("long",location.getLongitude()); // longituderesult.put("country",country.getNames().get("zh-CN"));// country nameresult.put("subdivision",subdivision.getNames().get("ja"));//provinceresult.put("city",city.getNames().get("ja")); // city} catch(Exception e){e.printStackTrace();}return result;}}