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Spring MongoDB简易实现查询附近的人功能

1.准备

1.创建一个springboot项目，准备一些用户坐标点数据，本案例使用广东博物馆西门分别为（1用户），广州图书馆西门（2用户），南方日报社（3用户）

2.搭建基础结构并编写代码

JSONResult

 @Data
@Accessors(chain = true)
public class JSONResult<T> implements Serializable {/** 状态值 */private Integer code;/** 提示信息 */private String msg;/** 数据 */private T data;public static <T> JSONResult<T> build(int code, String msg, T data) {return new JSONResult<T>().setCode(code).setMsg(msg).setData(data);}}

UserLocation

@Data
@NoArgsConstructor
@AllArgsConstructor
@Document(collection = "user_location")
//指定我们UserLocation这个实例中使用的是2dsphere二维球面的索引
@CompoundIndex(name = "location_index", def = "{'location': '2dsphere'}")
public class UserLocation implements java.io.Serializable{private static final long serialVersionUID = 4508868382007529970L;@Idprivate String id;private Long userId; //用户idprivate GeoJsonPoint location; //x:经度 y:纬度private String address; //位置描述private Long created; //创建时间private Long updated; //更新时间private Long lastUpdated; //上次更新时间}

UserLocationServiceImpl

@Service
public class UserLocationServiceImpl   {@Resourceprivate MongoTemplate mongoTemplate;public String updateUserLocation(Long userId, Double longitude, Double latitude, String address) {UserLocation userLocation = new UserLocation();userLocation.setAddress(address);userLocation.setLocation(new GeoJsonPoint(longitude, latitude));userLocation.setUserId(userId);Query query = Query.query(Criteria.where("userId").is(userLocation.getUserId()));UserLocation ul = this.mongoTemplate.findOne(query, UserLocation.class);if (ul == null) {//新增----mongodb中没有该用户数据userLocation.setCreated(System.currentTimeMillis());userLocation.setUpdated(userLocation.getCreated());userLocation.setLastUpdated(userLocation.getCreated());this.mongoTemplate.save(userLocation);return userLocation.getId();} else {//更新Update update = Update.update("location", userLocation.getLocation()).set("updated", System.currentTimeMillis()).set("lastUpdated", ul.getUpdated());this.mongoTemplate.updateFirst(query, update, UserLocation.class);}return ul.getId();}}

UserLocationController

@RestController
@RequestMapping("userLocation")
public class UserLocationController {@Resourceprivate UserLocationServiceImpl userLocationService;@Resourceprivate MongoTemplate mongoTemplate;@GetMapping("alive")public JSONResult<String> alive(){return JSONResult.build(200, "用户定位上发程序还活着！！！！",null );}@PostMapping("uploadUserLocation")public JSONResult<String> uploadUserLocation(Long userId, Double longitude, Double latitude, String address){String rowId = userLocationService.updateUserLocation(userId, longitude, latitude, address);JSONResult jsonResult = JSONResult.build(200, "地址生成成功！！",rowId );return jsonResult;}@PostMapping("queryByUserId")public JSONResult queryByUserId(Long userId){Query query = Query.query(Criteria.where("userId").is(userId));UserLocation one = mongoTemplate.findOne(query, UserLocation.class);if (one == null){return JSONResult.build(200, "查无该用户坐标位置！！",null);}return JSONResult.build(200, "查询成功，查询出坐标为！！",one );}@PostMapping("queryNearbyUserFromUserLocation")public JSONResult<List<UserLocation>> queryNearbyUserFromUserLocation(Double x, Double y, Integer range) {//找到中心点GeoJsonPoint geoJsonPoint = new GeoJsonPoint(x, y);//半径---Metric为接口，里面传入他的具体实现类Distance distance = new Distance(range / 1000, Metrics.KILOMETERS);//画圆Circle circle = new Circle(geoJsonPoint, distance);Query query = Query.query(Criteria.where("location").withinSphere(circle));List<UserLocation> userLocations = mongoTemplate.find(query, UserLocation.class);if (userLocations.isEmpty()){return JSONResult.build(200, "该用户坐标附近没有其他人！！",null);}List<Long> ids = userLocations.stream().map(UserLocation::getUserId).collect(Collectors.toList());return JSONResult.build(200, "该用户坐标附近的用户分别为"+ids+"！！",userLocations);}@PostMapping("userExitNearby")public JSONResult<List<UserLocation>> queryUserFromUserLocation(Long userId) {mongoTemplate.remove(new Query().addCriteria(Criteria.where("userId").is(userId)),UserLocation.class);return JSONResult.build(200, "用户退出附近的人成功！！",null);}
}

3.测试接口

1.分别存入3位用户

2.测试使用id查用户

3.使用广东博物馆西门的坐标测试附近有多少用户

3.1查1km内有多少用户

3.2查5km内有多少用户

4.退出1号看看，广东博物馆西门1km内还有多少用户

那么只剩下广州图书馆的2用户啦！！！