Java date日期类型，结束日期减去开始日期求两者时间差，精确到秒

 /**
  * @Author:
  * @Description:
  * @Date: 2019/4/10 19:01
  * @Modified By:
  */
 @Slf4j
 public class DateUtils {

     private static final long nd = 1000 * 24 * 60 * 60;
     private static final long nh = 1000 * 60 * 60;
     private static final long nm = 1000 * 60;

     /**
      * 计算两个时间段时间差，精确到秒
      * @param startTime 2019-04-10 17:16:11
      * @param endTime 2019-04-10 17:28:17
      * @return
      */
     public static String computationTime(Date startTime, Date endTime){
         try {
             log.info("开始时间->{}, 结束时间->{}",startTime, endTime);
             long diff = endTime.getTime() - startTime.getTime();
             long day = diff / nd;
             long hour = diff % nd / nh;
             long min = diff % nd % nh / nm;
             long sec = diff % nd % nh % nm / 1000;
             String str = day + "天" + hour + "小时" + min + "分钟" + sec + "秒";
             return str;
         }catch (Exception e) {
             log.info("计算两个时间段时间差出错了, {}",e);
             return null;
         }
     }
 }