public class CalendarDemo {       private static SimpleDateFormat date_format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");       public static void main(String[] args) {                      //获取calendar实例;           Calendar calendar = Calendar.getInstance();                      //判断calendar是不是GregorianCalendar类的实例;           if(calendar instanceof GregorianCalendar){               System.out.println("属于GregorianCalendar类的实例!");           }                      //从calendar对象中获得date对象，当前时间;           Date dates =  calendar.getTime();                      //格式化时间;           String date_str= date_format.format(dates);           System.out.println(date_str);                      //设置月份05；代表日历的月份6月，因为月份从0开始。           calendar.set(Calendar.MONTH, 05);                      int months = calendar.get(Calendar.MONTH);           System.out.println(months);  //输出05;                      //设置日期为2011-07-24 09：59:50           calendar.set(2011, 06, 24, 9, 59, 50);             String getDate = date_format.format(calendar.getTime());           System.out.println(getDate);   //输出2011-07-24 09:59:50;                      //比较日前大小;           if(new Date().getTime() > calendar.getTimeInMillis()){               System.out.println("当前日期在后!");           }else{               System.out.println("当前日期在前!");           }                      //设置当前时间为:2011-07-24 11:06:00           calendar.setTime(new Date());             int year   = calendar.get(Calendar.YEAR);   //获取年;           int month  = calendar.get(Calendar.MONTH);  //获取月;           int date   = calendar.get(Calendar.DATE);   //获取天;           int hour   = calendar.get(Calendar.HOUR);   //获取小时;           int minute = calendar.get(Calendar.MINUTE); //获取分钟;           int second = calendar.get(Calendar.SECOND); //获取秒钟;           int hour_of_day = calendar.get(Calendar.HOUR_OF_DAY);    //第几个小时，           int day_of_month  = calendar.get(Calendar.DAY_OF_MONTH); //这天，在一个月内是第几天.            int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);    //这天，在一周内，是第几天.           int day_of_year = calendar.get(Calendar.DAY_OF_YEAR);    //这天，在一年内，是第几天。           int week_of_year = calendar.get(Calendar.WEEK_OF_YEAR);  //这周，在一年内是第几周;           int week_of_month = calendar.get(Calendar.WEEK_OF_MONTH);//这周，在这个月是第几周;以以星为标准；           int zone_offset = calendar.get(Calendar.ZONE_OFFSET);    //获取时区;           int day_of_week_in_month = calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);  //某月中第几周，按这个月1号算，1号起就是第1周，8号起就是第2周。以月份天数为标准            int r = calendar.get(Calendar.AM_PM);           if(r==calendar.AM){               System.out.println("现在是上午");           }                      if(r==calendar.PM){               System.out.println("现在是下午");           }           System.out.println("==================================================");           System.out.println(year);           System.out.println(month);           System.out.println(date);           System.out.println(hour);           System.out.println(minute);           System.out.println(second);           System.out.println(hour_of_day);           System.out.println(day_of_month);           System.out.println(day_of_week);           System.out.println(day_of_year);           System.out.println(week_of_year);           System.out.println(week_of_month);           System.out.println(zone_offset);           System.out.println(day_of_week_in_month);       }   }

@RequestMapping(method = RequestMethod.GET, produces = { "application/json" })    @ResponseBody    public ListWithTotalCount
     
       aucLotQuery(@ModelAttribute("selectedAgency") SysAgencyDto selectedAgency,        int page, int rows, String order, String sort) {        Pageable pageable;        String agencyId = selectedAgency.getId().toString();        if (sort != null && !sort.isEmpty()) {            pageable = new PageRequest(page - 1, rows, Direction.fromStringOrNull(order), sort);        } else {            pageable = new PageRequest(page - 1, rows);        }        Calendar cal = Calendar.getInstance();        cal.set(Calendar.HOUR_OF_DAY, 0);        cal.set(Calendar.MINUTE, 0);        cal.set(Calendar.SECOND, 0);        cal.set(Calendar.MILLISECOND, 0);        Date less = cal.getTime();        cal.set(Calendar.HOUR_OF_DAY, 23);        cal.set(Calendar.MINUTE, 59);        cal.set(Calendar.SECOND, 59);        cal.set(Calendar.MILLISECOND, 999);        Date great = cal.getTime();        Specification
      
        spec = (root, query, cb) -> {            List
       
         predicates = new ArrayList
        
         ();            if (agencyId != null && !agencyId.isEmpty() && !"0".equals(agencyId)) {                Predicate predicate = cb.equal(root.get(Auction_.agencyId), agencyId);                predicates.add(predicate);            }            Predicate published = cb.equal(root.get(Auction_.isPublished), Auction.AUCLOT_ISPUBLISHED_FINISH);            predicates.add(published); 　　　　　　  //获取当天的检索条件            Predicate time =cb.between(root.get(Auction_.startTime),less,great);            predicates.add(time);                        return cb.and(predicates.toArray(new Predicate[0]));        };        Page
         
           pageresult = auctionRepository.findAll(spec, pageable);        List
          
            dtoList = (new AuctionsDTOAssembler()).toDTOList(pageresult.getContent()); return new ListWithTotalCount
           
            (dtoList, (int) pageresult.getTotalElements()); }