問(wèn)題描述

在 Java 中獲取地理位置的最佳方式是什么(如果可能，免費(fèi))?

What is the best way to get geo-location in Java (freely if possible)?

更新:不是來(lái)自 GPS 設(shè)備.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

推薦答案

一個(gè)簡(jiǎn)單的方法是使用 GeoLite (http://dev.maxmind.com/geoip/legacy/geolite/).因?yàn)樗褂帽镜財(cái)?shù)據(jù)庫(kù)，所以不需要網(wǎng)絡(luò)服務(wù)調(diào)用，而且對(duì)大量 IP 進(jìn)行地理編碼要快得多.

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:

添加這個(gè) Maven 工件:

Add this Maven artifact:

<dependency>
    <groupId>com.maxmind.geoip</groupId>
    <artifactId>geoip-api</artifactId>
    <version>1.2.11</version>
</dependency>

從 http://geolite.maxmind 下載地理位置數(shù)據(jù)文件.com/download/geoip/database/GeoLiteCity.dat.gz

解壓文件到任意文件夾.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");

結(jié)果將在 Location 對(duì)象中的 latitude、longitude、city、region 和 countryCode 屬性中.

The result will be in the Location object in the latitude, longitude, city, region and countryCode properties.

請(qǐng)查看他們的準(zhǔn)確度估算，以確保它滿足您項(xiàng)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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