判断当前时间是否在一个时间区间例如8点：21点

public static boolean getWorkTime(){
        String format = "HH:mm:ss";
        SimpleDateFormat sf = new SimpleDateFormat("HH:mm:ss");
        String now = sf.format(new Date());
//        now="21:00:09";
        boolean runFlag=false;
        try {
            Date nowTime = new SimpleDateFormat(format).parse(now);
            Date startTime = new SimpleDateFormat(format).parse("08:00:00");
            Date endTime = new SimpleDateFormat(format).parse("21:00:00");
            if (isEffectiveDate(nowTime, startTime, endTime)) {
                runFlag = true;
                log.info("系统时间在早上8点到下午21点之间.");
            } else {
                runFlag = false;
                log.info("系统时间不在早上8点到下午21点之间.");
            }
        } catch (java.text.ParseException e) {
            e.printStackTrace();
        }
        return runFlag;
    }


    /**
     * 判断当前时间是否在[startTime, endTime]区间，注意时间格式要一致
     *
     * @param nowTime 当前时间
     * @param startTime 开始时间
     * @param endTime 结束时间
     * @return
     * @author jqlin
     */
    public static boolean isEffectiveDate(Date nowTime, Date startTime, Date endTime) {
        if (nowTime.getTime() == startTime.getTime()
                || nowTime.getTime() == endTime.getTime()) {
            return false;
        }

        Calendar date = Calendar.getInstance();
        date.setTime(nowTime);

        Calendar begin = Calendar.getInstance();
        begin.setTime(startTime);

        Calendar end = Calendar.getInstance();
        end.setTime(endTime);

        if (date.after(begin) && date.before(end)) {
            return true;
        } else {
            return false;
        }
    }

如果对你有帮助请给小弟打赏下，祝你成功。