Bike:
package cn.edu360.web.pojo;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.index.GeoSpatialIndexType;
import org.springframework.data.mongodb.core.index.GeoSpatialIndexed;
import org.springframework.data.mongodb.core.mapping.Document;
@Document(collection = "bikes")
public class Bike {
@Id
private Long id;
private int status;
//地理位置字段,里面保存着经纬度,这个字段建立索引,那么一查找就快了,可以将地理坐标使用GeoHash转换一个字符窜,然后进行查找
//顺序=> 经度 维度
@GeoSpatialIndexed(type = GeoSpatialIndexType.GEO_2DSPHERE)
private double[] location;
//纬度
//private Double latitude;
//经度
//private Double longitude;
//二维码
private String qrCode;
}
serviceImpl:
public GeoResults<Bike> findNear(double longitude, double latitude) {
//查找附件500米的未使用的单车,要求只显示最近的10辆
NearQuery nearQuery = NearQuery.near(longitude, latitude, Metrics.KILOMETERS);
nearQuery.maxDistance(0.2).query(new Query().addCriteria(Criteria.where("status").is(0)).limit(10));
GeoResults<Bike> bikes = mongoTemplate.geoNear(nearQuery, Bike.class);
return bikes;
}