/**
     * 周
     */
    public static final String[] weeks = {
    
    "MON","TUE","WED","THU","FRI","SAT","SUN"};

    /**
     * 周
     */
    public static final List<String> weekList = Arrays.asList(weeks);

    /**
     * 生成cron表达式
     * @param min 分钟
     * @param hour 时间
     * @param day 日期
     * @param week 周
     * @return
     */
    private static String createLoopCronExpression(Integer min,Integer hour,Integer day,String week){
    
    
        String cron = "";
        if(Objects.isNull(min) || Objects.isNull(hour)){
    
    
            return cron;
        }
        String dayStr=null==day?"*":String.valueOf(day);
        if(StringUtils.isNotEmpty(week)){
    
    
            List<String> weeks = Arrays.asList(week.split(","));
            if(weekList.containsAll(weeks)){
    
    
                cron = "0 "+min+" "+hour+" ? * "+week;
            }
        }else {
    
    
            cron = "0 "+min+" "+hour+" "+dayStr+" * ?";
        }
        return cron;
    }

    /**
     * 创建每月循环cron表达式
     * @param min
     * @param hour
     * @return
     */
    public static String createLoopCronExpression(Integer min,Integer hour,Integer day){
    
    
        return createLoopCronExpression(min,hour,day,null);
    }

    /**
     * 创建每周循环cron表达式
     * @param min
     * @param hour
     * @return
     */
    public static String createLoopCronExpression(Integer min,Integer hour,String week){
    
    
        return createLoopCronExpression(min,hour,null,week);
    }

    /**
     * 创建每日循环cron表达式
     * @param min
     * @param hour
     * @return
     */
    public static String createLoopCronExpression(Integer min,Integer hour){
    
    
        return createLoopCronExpression(min,hour,null,null);
    }

    /**
     * 返回corn表达式下一次执行的时间
     * @param cron
     * @return
     */
    public static LocalDateTime cornToDate(String cron){
    
    
        return cornToDate(LocalDateTime.now(),cron);
    }

    public static LocalDateTime cornToDate(LocalDateTime now,String cron){
    
    
        CronSequenceGenerator g = new CronSequenceGenerator(cron);
        Date d = Date.from(now.atZone(ZoneId.systemDefault()).toInstant());
        d = g.next(d);
        LocalDateTime dateTime = d.toInstant().atZone(ZoneId.systemDefault())
                .toLocalDateTime();
        return dateTime;
    }

    /**
     * 获取每月重复下一次的正确时间
     * @param now
     * @param next
     * @return
     */
    public static LocalDateTime getNextDateOfCorn(LocalDateTime now,LocalDateTime next){
    
    
        Integer daySub = LocalDateTImeUtil.getDaySub(now,next);
        if(daySub>31){
    
    
            next = next.withMonth(next.getMonthValue()-1).with(TemporalAdjusters.lastDayOfMonth());
        }
        return next;
    }

    public static void main(String[] args) {
    
    
        //String cron = "0 18 9 ? * MON,TUE";
        //Arrays.asList(cron.split(" ")[5].split(",")).forEach(System.out::println);
        String cron = createLoopCronExpression(0,9,29,null);
        LocalDateTime now = LocalDateTime.now();
        LocalDateTime next;

        int size = 10;

        List<String> res = new ArrayList<>(size);
        CronSequenceGenerator g = new CronSequenceGenerator(cron);
        Date d = new Date();
        for (int i = 0; i < size; i++) {
    
    
            next = g.next(d).toInstant().atZone(ZoneId.systemDefault())
                    .toLocalDateTime();
            next = getNextDateOfCorn(now,next);
            res.add(next.toString());
            now = next;
            d = Date.from(next.atZone(ZoneId.systemDefault()).toInstant());
        }
        res.forEach(System.out::println);

        //String cron = createLoopCronExpression(0,9,null,null);

        //String cron = createLoopCronExpression(49,18);
        //String cron = createLoopCronExpression(49,18,"MON");
        //String cron = createLoopCronExpression(0,9,31);
        /*System.out.println(cron);
        LocalDateTime dateTime = cornToDate(cron);
        System.out.println(dateTime);
        System.out.println("day:"+dateTime.getDayOfMonth());
        System.out.println("week:"+weekList.get(dateTime.getDayOfWeek().getValue()-1));
        System.out.println("hour:"+dateTime.getHour());
        System.out.println("min:"+dateTime.getMinute());*/
        /*int size = 10;
        CronSequenceGenerator g = new CronSequenceGenerator(cron);
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        List<String> res = new ArrayList<>(size);

        for (int i = 0; i < size; i++) {
    
    
            d = g.next(d);
            res.add(sdf.format(d));
        }
        res.forEach(System.out::println);*/
    }