获取距离当前月最近的前五个月和后七个月

public static List<Map<Integer,Integer>> getLast12Months() {

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + 1); //要先+1,才能把本月的算进去</span>
    cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1);
    int year = cal.get(Calendar.YEAR);
    int month = cal.get(Calendar.MONTH)+1;
    int beforeYear = year - 1;
    int rearYear = year + 1;

    List<Map<Integer,Integer>> monthList = new ArrayList<>();
    for (int i = 5; i > 0; i--) {
        Map<Integer, Integer> monthAndYear = new HashMap<>();
        int beforeMonth = month - i;
        int abs = 12-Math.abs(beforeMonth);
        monthAndYear.put(abs,year);
        if (beforeMonth<0){
            monthAndYear.put(abs,beforeYear);
        }
        monthList.add(monthAndYear);
    }

    for (int i = 0; i < 7; i++) {
        Map<Integer, Integer> monthAndYear = new HashMap<>();
        int rearMonth = month + i;
        monthAndYear.put(rearMonth,year);
        if (rearMonth>12){
            monthAndYear.remove(rearMonth);
            monthAndYear.put(rearMonth-12,rearYear);
        }
        monthList.add(monthAndYear);
    }

    return monthList;
}