Java 计算 double参数的百分比，返回结果是带%

  /**
     * @param total  总数
     * @param cpnum  各产品数量
     * */
    public static String getPercentInfo(Double cpnum, Double total){
        if (cpnum == null || total == null || total <= 0) {
            return "0";
        }
        double fz = cpnum * 1.0;
        double fm = total * 1.0;
        double one = fz/fm;
        BigDecimal two = new BigDecimal(one);
        double three = two.setScale(2,BigDecimal.ROUND_HALF_UP).multiply(BigDecimal.valueOf(100)).doubleValue();
        String jtinfo = Double.toString(three)+"%";
        return jtinfo;
    }