把金额转换为汉字表示的数量，小数点后四舍五入保留两位

public class MoneyUtil {

    public static String[] chineseDigits = new String[] { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};

    /**
     * 把金额转换为汉字表示的数量，小数点后四舍五入保留两位
     * @param amount
     * @return
     */
    public static String amountToChinese(double amount) {

        if(amount > 99999999999999.99 || amount < -99999999999999.99)
            throw new IllegalArgumentException("参数值超出允许范围 (-99999999999999.99 ～ 99999999999999.99)！");

        boolean negative = false;
        if(amount < 0) {
            negative = true;
            amount = amount * (-1);
        }

        long temp = Math.round(amount * 100);
        int numFen = (int)(temp % 10); // 分
        temp = temp / 10;
        int numJiao = (int)(temp % 10); //角
        temp = temp / 10;
        //temp 目前是金额的整数部分

        int[] parts = new int[20]; // 其中的元素是把原来金额整数部分分割为值在 0~9999 之间的数的各个部分
        int numParts = 0; // 记录把原来金额整数部分分割为了几个部分（每部分都在 0~9999 之间）
        for(int i=0; ; i++) {
            if(temp ==0)
                break;
            int part = (int)(temp % 10000);
            parts[i] = part;
            numParts ++;
            temp = temp / 10000;
        }

        boolean beforeWanIsZero = true; // 标志“万”下面一级是不是 0

        String chineseStr = "";
        for(int i=0; i<numParts; i++) {

            String partChinese = partTranslate(parts[i]);
            if(i % 2 == 0) {
                if("".equals(partChinese))
                    beforeWanIsZero = true;
                else
                    beforeWanIsZero = false;
            }

            if(i != 0) {
                if(i % 2 == 0)
                    chineseStr = "亿" + chineseStr;
                else {
                    if("".equals(partChinese) && !beforeWanIsZero)   // 如果“万”对应的 part 为 0，而“万”下面一级不为 0，则不加“万”，而加“零”
                        chineseStr = "零" + chineseStr;
                    else {
                        if(parts[i-1] < 1000 && parts[i-1] > 0) // 如果"万"的部分不为 0, 而"万"前面的部分小于 1000 大于 0， 则万后面应该跟“零”
                            chineseStr = "零" + chineseStr;
                        chineseStr = "万" + chineseStr;
                    }
                }
            }
            chineseStr = partChinese + chineseStr;
        }

        if("".equals(chineseStr))  // 整数部分为 0, 则表达为"零元"
            chineseStr = chineseDigits[0];
        else if(negative) // 整数部分不为 0, 并且原金额为负数
            chineseStr = "负" + chineseStr;

        chineseStr = chineseStr + "元";

        if(numFen == 0 && numJiao == 0) {
            chineseStr = chineseStr + "整";
        }
        else if(numFen == 0) { // 0 分，角数不为 0
            chineseStr = chineseStr + chineseDigits[numJiao] + "角";
        }
        else { // “分”数不为 0
            if(numJiao == 0)
                chineseStr = chineseStr + "零" + chineseDigits[numFen] + "分";
            else
                chineseStr = chineseStr + chineseDigits[numJiao] + "角" + chineseDigits[numFen] + "分";
        }

        return chineseStr;

    }


    /**
     * 把一个 0~9999 之间的整数转换为汉字的字符串，如果是 0 则返回 ""
     * @param amountPart
     * @return
     */
    private static String partTranslate(int amountPart) {

        if(amountPart < 0 || amountPart > 10000) {
            throw new IllegalArgumentException("参数必须是大于等于 0，小于 10000 的整数！");
        }


        String[] units = new String[] {"", "拾", "佰", "仟"};

        int temp = amountPart;

        String amountStr = new Integer(amountPart).toString();
        int amountStrLength = amountStr.length();
        boolean lastIsZero = true; //在从低位往高位循环时，记录上一位数字是不是 0
        String chineseStr = "";

        for(int i=0; i<amountStrLength; i++) {
            if(temp == 0)  // 高位已无数据
                break;
            int digit = temp % 10;
            if(digit == 0) { // 取到的数字为 0
                if(!lastIsZero)  //前一个数字不是 0，则在当前汉字串前加“零”字;
                    chineseStr = "零" + chineseStr;
                lastIsZero = true;
            }
            else { // 取到的数字不是 0
                chineseStr = chineseDigits[digit] + units[i] + chineseStr;
                lastIsZero = false;
            }
            temp = temp / 10;
        }
        return chineseStr;
    }



    public static void main(String[] args) {

        if(args.length == 0) {
            System.out.println("转换演示：");
            System.out.println("-------------------------");
            System.out.println("25000000000005.999: " + amountToChinese(25000000000005.999));
            System.out.println("45689263.626: " + amountToChinese(45689263.626));
            System.out.println("0.69457: " + amountToChinese(0.69457));
            System.out.println("253.0: " + amountToChinese(253.0));
            System.out.println("0: " + amountToChinese(0));
            System.out.println("-------------------------");

System.out.println("999: " + amountToChinese(999));
           
            //System.out.println(Long.MAX_VALUE);
            //System.out.println(Long.MIN_VALUE);
        }
        else {
            System.out.println("转换结果：");
            System.out.println(args[0] + ": " + amountToChinese(Double.parseDouble(args[0])));
        }

    }

}



class MoneyFormat{
private final String [] pattern ={"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
private final String [] cPattern ={"","拾","佰","仟","万","拾","佰","仟","亿"};
private final String [] cfPattern = {"","角","分"};
private final String ZEOR = "零";
public MoneyFormat(){
System.out.println("run...");
 
}

public String format(String moneyString){
  int dotPoint = moneyString.indexOf("."); //判断是否为小数
  String moneyStr;     
  if(dotPoint != -1){
   moneyStr = moneyString.substring(0,moneyString.indexOf("."));
  }
  else{
   moneyStr = moneyString;
  }
  StringBuffer fraction = null;   //小数部分的处理,以及最后的yuan.
  StringBuffer ms = new StringBuffer();
  for(int i = 0;i < moneyStr.length();i++){
   ms.append(pattern[moneyStr.charAt(i) - 48]); //按数组的编号加入对应大写汉字
  }
 
  int cpCursor = 1;
  for(int j = moneyStr.length() - 1;j > 0;j--){
   ms.insert(j,cPattern[cpCursor]);   //在j之后加字符,不影响j对原字符串的相对位置
              //只是moneyStr.length()不断增加
              //insert(j,"string")就在j位置处插入,j=0时为第一位
   cpCursor = cpCursor == 8?1:cpCursor + 1;    //亿位之后重新循环
  }
 
 
  while(ms.indexOf("零拾") != -1){  //当十位为零时用一个"零"代替"零拾"
            //replace的起始于终止位置
   ms.replace(ms.indexOf("零拾"),ms.indexOf("零拾") + 2,ZEOR);
  }
  while(ms.indexOf("零佰") != -1){  //当百位为零时,同理
   ms.replace(ms.indexOf("零佰"),ms.indexOf("零佰") + 2,ZEOR);
  }
  while(ms.indexOf("零仟") != -1){  //同理
   ms.replace(ms.indexOf("零仟"),ms.indexOf("零仟") + 2,ZEOR);
  }
  while(ms.indexOf("零万") != -1){  //万需保留，中文习惯
   ms.replace(ms.indexOf("零万"),ms.indexOf("零万") + 2,"万");
  }
  while(ms.indexOf("零亿") != -1){  //同上
   ms.replace(ms.indexOf("零亿"),ms.indexOf("零亿") + 2,"亿");
  }
  while(ms.indexOf("零零") != -1){//有连续数位出现零，即有以下情况，此时根据习惯保留一个零即可
   ms.replace(ms.indexOf("零零"),ms.indexOf("零零") + 2,ZEOR);
  }
  while(ms.indexOf("亿万") != -1){  //特殊情况，如:100000000,根据习惯保留高位
   ms.replace(ms.indexOf("亿万"),ms.indexOf("亿万") + 2,"亿");
  }
  while(ms.lastIndexOf("零") == ms.length()-1){  //当结尾为零j，不必显示,经过处理也只可能出现一个零
   ms.delete(ms.lastIndexOf("零"),ms.lastIndexOf("零") + 1);
  }
 
 
  int end;
  if((dotPoint = moneyString.indexOf(".")) != -1 ){ //是小数的进入
   String fs = moneyString.substring(dotPoint + 1,moneyString.length());
   if(fs.indexOf("00") == -1 || fs.indexOf("00") >= 2){//若前两位小数全为零，则跳过操作
    end = fs.length() > 2?2:fs.length();  //仅保留两位小数
    fraction = new StringBuffer(fs.substring(0,end));
    for(int j = 0;j < fraction.length();j++){
     fraction.replace(j,j+1,this.pattern[fraction.charAt(j) - 48]); //替换大写汉字
    }
    for(int i = fraction.length();i > 0;i--){  //插入中文标识
     fraction.insert(i,cfPattern[i]);
    }
    fraction.insert(0,"元");      //为整数部分添加标识
   }
   else{
    fraction = new StringBuffer("元整");
   }
  
  }
  else{
   fraction = new StringBuffer("元整");
  }
  
  ms.append(fraction);         //加入小数部分
  return ms.toString();
}




public static void main(String [] ar){
  //System.out.println(new MoneyFormat().format("10005022.123009"));
  System.out.println(new MoneyFormat().format("999"));
}
}