在 Java 中获取地理位置的最佳方式是什么(如果可能,免费)?
What is the best way to get geo-location in Java (freely if possible)?
更新:不是来自 GPS 设备.基本上 Firefox 3.5/HTML 5 是如何做到的
Update: Not from a GPS device. Basically how Firefox 3.5 / HTML 5 does it
一个简单的方法是使用 GeoLite (http://dev.maxmind.com/geoip/legacy/geolite/).因为它使用本地数据库,所以不需要网络服务调用,而且对大量 IP 进行地理编码要快得多.
An easy way is with GeoLite (http://dev.maxmind.com/geoip/legacy/geolite/). Because it uses a local database no web service calls are needed and it's much faster for geocoding large numbers of IPs.
方法如下:
添加这个 Maven 工件:
Add this Maven artifact:
<dependency>
<groupId>com.maxmind.geoip</groupId>
<artifactId>geoip-api</artifactId>
<version>1.2.11</version>
</dependency>
从 http://geolite.maxmind 下载地理位置数据文件.com/download/geoip/database/GeoLiteCity.dat.gz
解压文件到任意文件夹.然后做:
Unpack the file into any folder. Then do:
LookupService cl = new LookupService("/var/geolite/GeoLiteCity.dat",
LookupService.GEOIP_MEMORY_CACHE | LookupService.GEOIP_CHECK_CACHE);
Location location = cl.getLocation("some ip address");
结果将在 Location 对象中的 latitude、longitude、city、region 和 countryCode 属性中.
The result will be in the Location object in the latitude, longitude, city, region and countryCode properties.
请查看他们的准确度估算,以确保它满足您项目的需求:http://www.maxmind.com/en/geolite_city_accuracy.
Please take a look at their accuracy estimates to ensure it meets the needs of your project: http://www.maxmind.com/en/geolite_city_accuracy .
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