获取过去12个月

/**
     * 获取过去的12个月 当dateSource为空时获取的当前月份之前的十二个月，不为空时获取指定月份之前的十二个月
     */
    public static String[] getPastTwelveYearMonth(String dateSource) {
        String[] lastTwelveMonths = new String[12];
        Calendar calendar = Calendar.getInstance();
        //如果当前日期大于二月份的天数28天或者29天会导致计算月份错误，会多出一个三月份，故设置一个靠前日期解决此问题
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        if (!FCRMStringUtils.isEmpty(dateSource)) {
            calendar = setTime(dateSource);
        }
        for (int i = 0; i < 12; i++) {
            if (calendar.get(Calendar.MONTH) != 0) {
                if (calendar.get(Calendar.MONTH) > 0 && calendar.get(Calendar.MONTH) < 10) {
                    lastTwelveMonths[11 - i] = calendar.get(Calendar.YEAR) + "-0" + (calendar.get(Calendar.MONTH));
                } else {
                    lastTwelveMonths[11 - i] = calendar.get(Calendar.YEAR) + "-" + (calendar.get(Calendar.MONTH));
                }
            } else {
                lastTwelveMonths[11 - i] = calendar.get(Calendar.YEAR) - 1 + "-" + 12;
            }
            //逐次往前推1个月
            calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1);
        }
        for (int i = 0; i < lastTwelveMonths.length; i++) {
            System.out.println(lastTwelveMonths[i]);
        }
        return lastTwelveMonths;
    }

    /**
     * 获取过去的3个月 当dateSource为空时获取的当前月份之前的三个月，不为空时获取指定月份之前的十三个月
     */
    public static String[] getPastThreeYearMonth(String dateSource) {
        String[] lastThreeMonths = new String[3];
        Calendar calendar = Calendar.getInstance();
        //如果当前日期大于二月份的天数28天或者29天会导致计算月份错误，会多出一个三月份，故设置一个靠前日期解决此问题
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        if (!FCRMStringUtils.isEmpty(dateSource)) {
            calendar = setTime(dateSource);
        }
        for (int i = 0; i < 3; i++) {
            if (calendar.get(Calendar.MONTH) != 0) {
                if (calendar.get(Calendar.MONTH) > 0 && calendar.get(Calendar.MONTH) < 10) {
                    lastThreeMonths[2 - i] = calendar.get(Calendar.YEAR) + "-0" + (calendar.get(Calendar.MONTH));
                } else {
                    lastThreeMonths[2 - i] = calendar.get(Calendar.YEAR) + "-" + (calendar.get(Calendar.MONTH));
                }
            } else {
                lastThreeMonths[2 - i] = calendar.get(Calendar.YEAR) - 1 + "-" + 12;
            }
            //逐次往前推1个月
            calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1);
        }
        for (int i = 0; i < lastThreeMonths.length; i++) {
            System.out.println(lastThreeMonths[i]);
        }
        return lastThreeMonths;
    }

    /**
     * 获取指定月份的Calendar对象
     *
     * @param dateSource
     * @return
     */
    private static Calendar setTime(String dateSource) {
        // 创建 Calendar 对象
        // 默认是当前日期
        Calendar calendar = Calendar.getInstance();
        try {
            // 对 calendar 设置时间的方法
            // 设置传入的时间格式
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
            // 指定一个日期
            Date date = dateFormat.parse(dateSource);
            // 对 calendar 设置为 date 所定的日期
            calendar.setTime(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return calendar;
    }

/**
     * 获取当前月份的前一个月
     *
     * @return
     */
    public static String getPreviousOneMonthString() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
        calendar.setTime(new Date());
        calendar.add(Calendar.MONTH, -1);
        Date date = calendar.getTime();
        String month = dateFormat.format(date);
        return month;
    }

    /**
     * 获取当前月份的下一个月
     *
     * @return
     */
    public static String getNextOneMonthString(String StrMonth) {
        Calendar calendar;
        if(FCRMStringUtils.isNotEmpty(StrMonth)){
            calendar =  setTime(StrMonth);
        }else{
            calendar = Calendar.getInstance();
            calendar.setTime(new Date());
        }
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
        calendar.add(Calendar.MONTH, 1);
        Date date = calendar.getTime();
        String month = dateFormat.format(date);
        return month;
    }

    /**
     * 获取当前月份
     *
     * @return
     */
    public static String getPresentMonthString() {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
        calendar.setTime(new Date());
        Date date = calendar.getTime();
        String month = dateFormat.format(date);
        return month;
    }