public static void main(String[] args) throws ParseException {
    System.out.println(getResults("2017-12-01","2018-02-02"));
}

public static List<String> getResults(String a, String b) throws ParseException {
     a = "2017-12-01";
     b = "2018-02-02";

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
            Date ad = sdf.parse(a);
            Date bd = sdf.parse(b);

            Calendar cl1 = Calendar.getInstance();
            cl1.setTime(ad);
            Calendar cl2 = Calendar.getInstance();
            cl2.setTime(bd);

            System.out.println(cl1.get(Calendar.YEAR) + "-" + cl1.get(Calendar.DAY_OF_WEEK));

            Map<Integer, List<String>> result = new HashMap<Integer, List<String>>();

            int num = 0;

            while (true) {
                if (cl2.compareTo(cl1) <= 0) {
                    break;
                }

                int count = 7;

                if (num == 0) {
                    int day = cl1.get(Calendar.DAY_OF_WEEK) - 1;
                    day = day == 0 ? 7 : day;
                    count = 7 - day + 1;
                }
                if (!result.containsKey(num)) {
                    result.put(num, new ArrayList<String>());
                }

                for (int i = 0; i < count; i++) {
                    result.get(num).add(sdf.format(cl1.getTime()));
                    cl1.add(Calendar.DAY_OF_WEEK, 1);
                    if (cl2.compareTo(cl1) <= 0) {
                        break;
                    }
                }
                num++;
            }

            List<String> time = new ArrayList<String>();

            for (Map.Entry<Integer, List<String>> entry : result.entrySet()) {
                List<String> temp = entry.getValue();
                String str = temp.get(0) + "~" + temp.get(temp.size() - 1);
                time.add(str);
            }
            return time;
    }

保持一個記筆記的習慣,有的地方可能不是很對.,另有此文章為一位論壇老哥(pengfeizhang1994)教的,再次感謝.