一、简介

1.1 介绍

Determine the country, subdivisions (regions), city, and postal code associated with IPv4 and IPv6 addresses worldwide.

1.2 参考文档

https://dev.maxmind.com/geoip/docs/databases/city-and-country?lang=en#binary-databases

https://github.com/jianhuasun/GeoIP2-java

二、下载依赖库

2.1 下载地址：

tips: 需要注册登录

https://dev.maxmind.com/geoip/geolite2-free-geolocation-data?lang=en
打开页面登录点击: "Download Files"

三、项目中引依赖jar

Maven
We recommend installing this package with Maven. To do this, add the dependency to your pom.xml:

<dependency>
    <groupId>com.maxmind.geoip2</groupId>
    <artifactId>geoip2</artifactId>
    <version>3.0.1</version>
</dependency>

Gradle
Add the following to your build.gradle file:

repositories {
    mavenCentral()
}
dependencies {
    compile 'com.maxmind.geoip2:geoip2:3.0.1'
}

四、引入库并编写代码测试

// A File object pointing to your GeoIP2 or GeoLite2 database
File database = new File("/path/to/GeoIP2-City.mmdb");

// This creates the DatabaseReader object. To improve performance, reuse
// the object across lookups. The object is thread-safe.
DatabaseReader reader = new DatabaseReader.Builder(database).build();

InetAddress ipAddress = InetAddress.getByName("128.101.101.101");

// Replace "city" with the appropriate method for your database, e.g.,
// "country".
CityResponse response = reader.city(ipAddress);

Country country = response.getCountry();
System.out.println(country.getIsoCode());            // 'US'
System.out.println(country.getName());               // 'United States'
System.out.println(country.getNames().get("zh-CN")); // '美国'

Subdivision subdivision = response.getMostSpecificSubdivision();
System.out.println(subdivision.getName());    // 'Minnesota'
System.out.println(subdivision.getIsoCode()); // 'MN'

City city = response.getCity();
System.out.println(city.getName()); // 'Minneapolis'

Postal postal = response.getPostal();
System.out.println(postal.getCode()); // '55455'

Location location = response.getLocation();
System.out.println(location.getLatitude());  // 44.9733
System.out.println(location.getLongitude()); // -93.2323

五、常见问题

5.1 版本问题

jar 包版本3.0.1需要java11以上，2.16.1使用java8测试通过

5.2 按需引入

库分为城市和国家，GeoLite2-Country.mmdb 和 GeoLite2-City.mmdb
City库 包含了城市，文件较大（~64M），Country只有国家文件较小（~2M）。

版权属于：sunjianhua

本文链接：https://sunjianhua.cn/archives/java-ip-country-city.html

转载时须注明出处及本声明，如果不小心侵犯了您的权益，请联系邮箱：NTA2MTkzNjQ1QHFxLmNvbQ==