SpringBoot整合Redis实现附近位置查找(LBS)功能

# 使用 Docker 启动 Redis
$ docker run -d --name redis -p 6379:6379 redis:latest

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

spring:
  redis:
    host: localhost
    port: 6379
    lettuce:
      pool:
        max-active: 8
        max-idle: 8
        min-idle: 0
        max-wait: -1ms

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Store {
    private Long id;
    private String name;
    private double longitude;
    private double latitude;
    private String address;
}

@Autowired
private RedisTemplate<String, String> redisTemplate;

private static final String GEO_KEY = "stores:geo";

public void addStore(Store store) {
    redisTemplate.opsForGeo().add(
        GEO_KEY,
        new Point(store.getLongitude(), store.getLatitude()),
        store.getId().toString()
    );
}

public List<Store> findNearbyStores(double longitude, double latitude, double radiusKm) {
		// 创建该坐标需要查找的半径
    Circle circle = new Circle(new Point(longitude, latitude), new Distance(radiusKm, Metrics.KILOMETERS));

   // 创建所需结果集参数
    RedisGeoCommands.GeoRadiusCommandArgs args = RedisGeoCommands.GeoRadiusCommandArgs.newGeoRadiusArgs()
            .includeDistance() //包含距离
            .includeCoordinates() //包含坐标
            .sortAscending() //升序排列
            .limit(10);  //结果集数量

    GeoResults<RedisGeoCommands.GeoLocation<String>> results = redisTemplate.opsForGeo().radius(GEO_KEY, circle, args);

    List<Store> stores = new ArrayList<>();
    if (results != null) {
        for (GeoResult<RedisGeoCommands.GeoLocation<String>> result : results) {
            String storeId = result.getContent().getName();
            Point point = result.getContent().getPoint();
            Distance distance = result.getDistance();
            stores.add(new Store(Long.parseLong(storeId), "", point.getX(), point.getY(), ""));
            System.out.println("Store ID: " + storeId + ", Distance: " + distance.getValue() + " km");
        }
    }
    return stores;
}

@SpringBootTest
class CharmingApplicationTests {

    @Autowired
    private RedisTemplate redisTemplate;

    private static final String GEO_KEY = "stores:geo";

    @Test
    void testFindNearbyStores() {
        redisTemplate.delete(GEO_KEY);

        List<Store> testStores = List.of(
            new Store(100L, "Store A", 116.404, 39.915, "北京天安门"),
            new Store(200L, "Store B", 116.461, 39.923, "北京三里屯"),
            new Store(300L, "Store C", 116.355, 39.901, "北京西单")
        );

        for (Store store : testStores) {
            redisTemplate.opsForGeo().add(GEO_KEY, new Point(store.getLongitude(), store.getLatitude()), store.getId().toString());
        }

        findNearbyStores(116.40, 39.90, 5.0);
    }
}