获取两个日期间月份

    /**
     * 获取两个日期间月份
     * @param minDate 开始日期
     * @param maxDate 结束日期
     * @return
     * @throws ParseException
     */
    public static List<String> getMonthBetween(String minDate, String maxDate) throws ParseException {
        ArrayList<String> result = new ArrayList<String>();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");//格式化为年月

        Calendar min = Calendar.getInstance();
        Calendar max = Calendar.getInstance();

        min.setTime(sdf.parse(minDate));
        min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);

        max.setTime(sdf.parse(maxDate));
        max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);
        Calendar curr = min;
        while (curr.before(max)) {
            result.add(sdf.format(curr.getTime()));
            curr.add(Calendar.MONTH, 1);
        }
        min = null;max = null;curr = null;
        return result;
    }

    /**
     * 获取指定年月的最后一天
     * @param yearMonth yyyy-MM
     * @return
     */
    public static String getLastDayOfMonth(String yearMonth) {
        int year = Integer.parseInt(yearMonth.split("-")[0]);  //年
        int month = Integer.parseInt(yearMonth.split("-")[1]); //月
        Calendar cal = Calendar.getInstance();
        // 设置年份
        cal.set(Calendar.YEAR, year);
        // 设置月份
        // cal.set(Calendar.MONTH, month - 1);
        cal.set(Calendar.MONTH, month); //设置当前月的上一个月
        // 获取某月最大天数
        //int lastDay = cal.getActualMaximum(Calendar.DATE);
        int lastDay = cal.getMinimum(Calendar.DATE); //获取月份中的最小值，即第一天
        // 设置日历中月份的最大天数
        //cal.set(Calendar.DAY_OF_MONTH, lastDay);
        cal.set(Calendar.DAY_OF_MONTH, lastDay - 1); //上月的第一天减去1就是当月的最后一天
        // 格式化日期
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        return sdf.format(cal.getTime());
    }


    /**
     * 推算时间
     * @param yyyyMM
     * @param forward
     * @return
     */
    public static Date forwardDate(String yyyyMM, int forward) {
        Date date = DateUtil.str2Date(yyyyMM, DATE_FORMAT_YYYY_MM);
        Calendar instance = Calendar.getInstance();
        instance.setTime(date);
        instance.add(Calendar.MONTH, forward);
        return instance.getTime();
    }

    /**
     * 获取当前月份的上一个月
     * @return
     */
    public static String getLastMonth(){
        SimpleDateFormat sdfMonth = new SimpleDateFormat("yyyy-MM");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.MONTH, -1);
        Date m = c.getTime();
        String month = sdfMonth.format(m);
        return month;
    }

    /**
     * 获取当前月份的上n个月
     * @return
     */
    public static String getLastMonth(int n){
        SimpleDateFormat sdfMonth = new SimpleDateFormat("yyyy-MM");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.MONTH, -n);
        Date m = c.getTime();
        String month = sdfMonth.format(m);
        return month;
    }