计算两个数值的商

    /***
     * 获得两个数值的商（正数且保留九位小数）
     * @param a
     * @param b
     * @return
     */
    public static BigDecimal getLongTwoNumberMerchantUp(Long a, Long b){
        if(a==null || b == null || b==0 || a ==0){
            return new BigDecimal("0");
        }
        BigDecimal one = new BigDecimal(a.toString());
        BigDecimal two = new BigDecimal(b.toString());
        return one.divide(two,9,BigDecimal.ROUND_HALF_UP);//四舍五入
    }