根據傳入的開始時間和結束時間生成中間的日期，返回結果排序

/*查詢某一天時間段的付款金額*/
@Override
public R getDayData(Long instituId, String beginDate,String endDate) {
    List<Map> list=baseMapper.getDayData(instituId,beginDate,endDate);
    /*補全其餘沒有數據的日期*/
    List<String> allDate = new ArrayList();
    try {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date dBegin =sdf.parse(beginDate);
        Date dEnd = sdf.parse(endDate);
        allDate.add(sdf.format(dBegin));
        Calendar cal=Calendar.getInstance();
        cal.setTime(sdf.parse(beginDate));
        boolean bContinue = true;
        while (bContinue){
            cal.add(Calendar.DAY_OF_MONTH, 1);
            if(sdf.parse(endDate).after(cal.getTime())){
                allDate.add(sdf.format(cal.getTime()));
            }else{
                break;
            }
        }
    } catch (ParseException e) {
        e.printStackTrace();
    }
    allDate.add(endDate);
    //造好的日期集合
    List<Map> newTime=new ArrayList<>();
    for(String time:allDate) {
        Map m = new HashMap();
        m.put("payTime", time);
        m.put("payment", 0);
        newTime.add(m);
        for(Map map:list){
            if(time.equals(map.get("payTime").toString())){
                newTime.remove(m);
            }
        }
    }
    //返回結果
    List<Map> newList=new ArrayList<>();
    newList.addAll(list);
    newList.addAll(newTime);
    //返回集合排序
    Collections.sort(newList, new Comparator<Map>() {
        @Override
        public int compare(Map o1, Map o2) {
            String payTime1=o1.get("payTime").toString();
            String payTime2=o2.get("payTime").toString();
            return payTime1.compareTo(payTime2);
        }
    });
    return R.ok(newList);
}