您可以使用geoNear 聚合来做到这一点。在 spring-data-mongodb GeoNearOperation中表示此聚合。
扩展或创建Place
具有您希望获得距离信息的字段的继承类(继承示例):
public class PlaceWithDistance extends Place {
private double distance;
public double getDistance() {
return distance;
}
public void setDistance(final double distance) {
this.distance = distance;
}
}
而不是Criteria
使用Query
聚合。的第二个参数geoNear
是应设置距离的字段名称:
final NearQuery nearQuery = NearQuery
.near(new Point(searchRequest.getLat(), searchRequest.getLng()));
nearQuery.num(5);
nearQuery.spherical(true); // if using 2dsphere index, otherwise delete or set false
// "distance" argument is name of field for distance
final Aggregation a = newAggregation(geoNear(nearQuery, "distance"));
final AggregationResults<PlaceWithDistance> results =
mongoTemplate.aggregate(a, Place.class, PlaceWithDistance.class);
// results.forEach(System.out::println);
List<PlaceWithDistance> ls = results.getMappedResults();
只是为了让它更容易 - 相关的进口:
import static org.springframework.data.mongodb.core.aggregation.Aggregation.geoNear;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.newAggregation;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;
import org.springframework.data.mongodb.core.aggregation.GeoNearOperation;
import org.springframework.data.mongodb.core.query.NearQuery;