/**
     * 获取最近7天
     */
    public static List getSevenDay() {
        Map<String, List> map = new HashMap();
        List lastSevenDay = new ArrayList();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        for (int i=0;i<7;i++){
            cal.add(Calendar.DAY_OF_MONTH, -1);
            lastSevenDay.add(i,  sdf.format(cal.getTime()));
        }
        return lastSevenDay;
    }

  /**
     * 获取最近12个月
     */
    public static Map<String, List> get12Month() {
        Map<String, List> map = new HashMap();
        List last12Months = new ArrayList();
        List<String> xAxis = new ArrayList<>();
        Calendar cal = 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
        cal.set(Calendar.DAY_OF_MONTH, 1);
        for (int i = 0; i < 12; i++) {
            xAxis.add(i, (cal.get(Calendar.MONTH) + 1)+"月");
            last12Months.add(i, cal.get(Calendar.YEAR)+""+ ((cal.get(Calendar.MONTH) + 1)<10 ? "0"+(cal.get(Calendar.MONTH) + 1):(cal.get(Calendar.MONTH) + 1)));
            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1); //逐次往前推1个月
        }
        map.put("last12Months", last12Months);
        map.put("xAxis", xAxis);
        return map;
    }