Redis Geo实现地理位置检索功能

GEOADD storeId:location 116.48 39.95 store:1001
GEOADD storeId:location 116.50 39.96 store:1002
GEOADD storeId:location 116.30 39.90 store:1003

GEOSEARCH storeId:location \
FROMLONLAT 116.48 39.95 \ # 以指定经纬度为中心
BYRADIUS 5 km \ # 搜索半径5公里
WITHDIST \ # 返回距离中心点的距离
WITHCOORD \ # 返回目标的经纬度
COUNT 20 ASC # 最多20条，由近及远排序
## Redis 6.2 以下旧版本，可使用以下命令
GEORADIUS storeId:location 116.48 39.95 5 km WITHCOORD

@Service
public class LocationService {
    @Autowired
    private RedisTemplate<String, String> redisTemplate;
    private static final String GEO_KEY = "storeId:location";
    public void updateLocation(Long storeId, double lng, double lat) {
        // 先删旧位置，再添加新位置
        redisTemplate.opsForGeo().remove(GEO_KEY, storeId.toString());
        redisTemplate.opsForGeo().add(GEO_KEY, new Point(lng, lat), storeId.toString());
    }
    public GeoResults<RedisGeoCommands.GeoLocation<String>> 
            findNearby(double lng, double lat, double radius) {
        Circle circle = new Circle(new Point(lng, lat), 
                                   new Distance(radius, Metrics.KILOMETERS));
        return redisTemplate.opsForGeo().radius(GEO_KEY, circle,
            RedisGeoCommands.GeoRadiusCommandArgs.newGeoRadiusArgs()
                .includeDistance()
                .includeCoordinates()
                .sortAscending()
                .limit(20));
    }
}