字符串金额-i18n

AmountAsStringi18n.java

    private static String convertStringNumber(String stringNumber, Locale locale){
        BigDecimal dec = new BigDecimal(stringNumber);
        int scale = dec.scale();
        String format;
        switch (scale) {
            case 0: format = ",##0"; break;
            case 1: format = ",##0.0"; break;
            case 2: format = ",##0.00"; break;
            case 3: format = ",##0.000"; break;
            case 4: format = ",##0.0000"; break;
            default:
                StringBuffer sb = new StringBuffer(",##0.");
                for (int i = 0; i < scale; i++) {
                    sb.append('0');
                }

                format = sb.toString();
        }

        DecimalFormat df = (DecimalFormat) NumberFormat.getInstance(locale);
        df.applyPattern(format);
        return df.format(dec);
    }