使用BigDecimal转换较长小数时候出现科学计数法的问题

     public static String divToString(double v1, double v2, int scale){
         if (scale < 0) {
             throw new IllegalArgumentException(
                     "The scale must be a positive integer or zero");
         }
         BigDecimal b1 = new BigDecimal(Double.toString(v1));
         BigDecimal b2 = new BigDecimal(Double.toString(v2));
         return  b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).toString();
     }

只要将BigDecimal 对象toString()就好。