【工具类】java数字金额转换成大写

public class MoneyUtil {
  /** 大写数字 */
  private static final String[] NUMBERS = { "零", "壹", "贰", "叁", "肆", "伍", "陆",
      "柒", "捌", "玖" };
  /** 整数部分的单位 */
  private static final String[] IUNIT = { "元", "拾", "佰", "仟", "万", "拾", "佰",
      "仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟" };
  /** 小数部分的单位 */
  private static final String[] DUNIT = { "角", "分", "厘" };
  /**
   * 得到大写金额。
   */
  public static String toChinese(String str) {
    str = str.replaceAll(",", "");// 去掉","
    String integerStr;// 整数部分数字
    String decimalStr;// 小数部分数字
    // 初始化：分离整数部分和小数部分
    if (str.indexOf(".") > 0) {
      integerStr = str.substring(0, str.indexOf("."));
      decimalStr = str.substring(str.indexOf(".") + 1);
    } else if (str.indexOf(".") == 0) {
      integerStr = "";
      decimalStr = str.substring(1);
    } else {
      integerStr = str;
      decimalStr = "";
    }
    // integerStr去掉首0，不必去掉decimalStr的尾0(超出部分舍去)
    if (!integerStr.equals("")) {
      integerStr = Long.toString(Long.parseLong(integerStr));
      if (integerStr.equals("0")) {
        integerStr = "";
      }
    }
    // overflow超出处理能力，直接返回
    if (integerStr.length() > IUNIT.length) {
      System.out.println(str + ":超出处理能力");
      return str;
    }
    int[] integers = toArray(integerStr);// 整数部分数字
    boolean isMust5 = isMust5(integerStr);// 设置万单位
    int[] decimals = toArray(decimalStr);// 小数部分数字
    return getChineseInteger(integers, isMust5) + getChineseDecimal(decimals);
  }
  /**
   * 整数部分和小数部分转换为数组，从高位至低位
   */
  private static int[] toArray(String number) {
    int[] array = new int[number.length()];
    for (int i = 0; i < number.length(); i++) {
      array[i] = Integer.parseInt(number.substring(i, i + 1));
    }
    return array;
  }
  /**
   * 得到中文金额的整数部分。
   */
  private static String getChineseInteger(int[] integers, boolean isMust5) {
    StringBuffer chineseInteger = new StringBuffer("");
    int length = integers.length;
    for (int i = 0; i < length; i++) {
      // 0出现在关键位置：1234(万)5678(亿)9012(万)3456(元)
      // 特殊情况：10(拾元、壹拾元、壹拾万元、拾万元)
      String key = "";
      if (integers[i] == 0) {
        if ((length - i) == 13)// 万(亿)(必填)
          key = IUNIT[4];
        else if ((length - i) == 9)// 亿(必填)
          key = IUNIT[8];
        else if ((length - i) == 5 && isMust5)// 万(不必填)
          key = IUNIT[4];
        else if ((length - i) == 1)// 元(必填)
          key = IUNIT[0];
        // 0遇非0时补零，不包含最后一位
        if ((length - i) > 1 && integers[i + 1] != 0)
          key += NUMBERS[0];
      }
      chineseInteger.append(integers[i] == 0 ? key
          : (NUMBERS[integers[i]] + IUNIT[length - i - 1]));
    }
    return chineseInteger.toString();
  }
  /**
   * 得到中文金额的小数部分。
   */
  private static String getChineseDecimal(int[] decimals) {
    StringBuffer chineseDecimal = new StringBuffer("");
    for (int i = 0; i < decimals.length; i++) {
      // 舍去3位小数之后的
      if (i == 3)
        break;
      chineseDecimal.append(decimals[i] == 0 ? ""
          : (NUMBERS[decimals[i]] + DUNIT[i]));
    }
    return chineseDecimal.toString();
  }
  /**
   * 判断第5位数字的单位"万"是否应加。
   */
  private static boolean isMust5(String integerStr) {
    int length = integerStr.length();
    if (length > 4) {
      String subInteger = "";
      if (length > 8) {
        // 取得从低位数，第5到第8位的字串
        subInteger = integerStr.substring(length - 8, length - 4);
      } else {
        subInteger = integerStr.substring(0, length - 4);
      }
      return Integer.parseInt(subInteger) > 0;
    } else {
      return false;
    }
  }
  public static void main(String[] args) {
    String number = "1.23";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
    number = "1234567890123456.123";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
    number = "0.0798";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
    number = "10,001,000.09";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
    number = "01.107700";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
    number = "01.107700";
    System.out.println(number + " " + MoneyUtil.toChinese(number));
  }
}