java 获取两个日期之间的所有天数

 Calendar start = Calendar.getInstance();
        start.set(2017, 2, 20);
        Long startTIme = start.getTimeInMillis();  

        Calendar end = Calendar.getInstance();
        end.set(2017, 2, 23);
        Long endTime = end.getTimeInMillis();  

        Long oneDay = 1000 * 60 * 60 * 24l;  

        Long time = startTIme;
        while (time <= endTime) {
            Date d = new Date(time);
            DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
            System.out.println(df.format(d));
            time += oneDay;
        }