java常用操作方法（五）金额 MoneyUtil

package com.jinqiao.util;

import javax.persistence.Entity;

@Entity
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 > {
            // 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 = "54452";
        System.out.println(number + " " + MoneyUtil.toChinese(number));
        number = "30200";
        System.out.println(number + " " + MoneyUtil.toChinese(number));
        number = "30000.05";
        System.out.println(number + " " + MoneyUtil.toChinese(number));
        number = "30000.00";
        System.out.println(number + " " + MoneyUtil.toChinese(number));    
      }

    }