mongoDB Java 获取某一字段的值

public List<Locality> selectHotCity(){
    DBObject dbObject = new BasicDBObject();
    dbObject.put("isHot", true);
    DBObject fieldObject = new BasicDBObject();
    fieldObject.put("zhName", true);
    fieldObject.put("_id", true);
    Query query = new BasicQuery(dbObject, fieldObject);
    List<Locality> hotCities=mongoTemplate.find(query, Locality.class);
    return hotCities;
}