Spring Data MongoDB:查询月份

import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import java.util.Date;
import java.util.List;

public class MyMongoDBRepository {
    private final MongoTemplate mongoTemplate;

    public MyMongoDBRepository(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    public List<MyData> findByMonth(int year, int month) {
        // 构建查询条件
        Criteria criteria = Criteria.where("dateField").gte(getFirstDayOfMonth(year, month))
                .lt(getFirstDayOfMonth(year, month + 1));

        // 构建查询对象
        Query query = new Query(criteria);

        // 执行查询
        return mongoTemplate.find(query, MyData.class);
    }

    private Date getFirstDayOfMonth(int year, int month) {
        // 获取指定月份的第一天
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }
}