金额转换

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package com.ebb365.beans;
/**
* @(#)SimpleMoneyFormat.java
*
*金额转换，阿拉伯数字的金额转换为中国传统的形式输出
* @lpxuan
* @version 1.00 2008/7/31
*/

import java.text.NumberFormat;
import java.util.HashMap;
import java.lang.StringBuffer;

public class SimpleMoneyFormat {

    public static final String EMPTY="";
    public static final String ZERO="零";
    public static final String ONE="壹";
    public static final String TWO="贰";
    public static final String THREE="叁";
    public static final String FOUR="肆";
    public static final String FIVE="伍";
    public static final String SIX="陆";
    public static final String SEVEN="柒";
    public static final String EIGHT="捌";
    public static final String NINE="玖";
    public static final String TEN="拾";
    public static final String HUNDRED="佰";
    public static final String THOUSAND="仟";
    public static final String TEN_THOUSAND="万";
    public static final String HUNDRED_MILLION="亿";
    public static final String YUAN="元";
    public static final String JIAO="角";
    public static final String FEN="分";
    public static final String DOT=".";

    private static SimpleMoneyFormat formatter=null;
    private HashMap chineseNumberMap=new HashMap();
    private HashMap chineseMoenyPattern=new HashMap();
    private NumberFormat numberFormat=NumberFormat.getInstance();

    //私有构造函数
    private SimpleMoneyFormat() {
     numberFormat.setMaximumFractionDigits(4);
     numberFormat.setMinimumFractionDigits(2);
     numberFormat.setGroupingUsed(false);

     chineseNumberMap.put("0",ZERO);
     chineseNumberMap.put("1",ONE);
     chineseNumberMap.put("2",TWO);
     chineseNumberMap.put("3",THREE);
     chineseNumberMap.put("4",FOUR);
     chineseNumberMap.put("5",FIVE);
     chineseNumberMap.put("6",SIX);
     chineseNumberMap.put("7",SEVEN);
     chineseNumberMap.put("8",EIGHT);
     chineseNumberMap.put("9",NINE);
     chineseNumberMap.put(DOT,DOT);

     chineseMoenyPattern.put("1",TEN);
     chineseMoenyPattern.put("2",HUNDRED);
     chineseMoenyPattern.put("3",THOUSAND);
     chineseMoenyPattern.put("4",TEN_THOUSAND);
     chineseMoenyPattern.put("5",TEN);
     chineseMoenyPattern.put("6",HUNDRED);
     chineseMoenyPattern.put("7",THOUSAND);
     chineseMoenyPattern.put("8",HUNDRED_MILLION);
    }

    //单例模式
    public static SimpleMoneyFormat getInstance(){
     if(formatter==null)
      formatter=new SimpleMoneyFormat();
     return formatter;
    }

    public String format(String moneyStr){
     checkPrecision(moneyStr);
     String result;
     result=convertToChineseNumber(moneyStr);
     result=addUnitsToChineseMoenyString(result);
     return result;
    }

    public String format(double moneyDouble){
     return format(numberFormat.format(moneyDouble));
    }

    public String format(int moneyInt){
     return format(numberFormat.format(moneyInt));
    }

    public String format(long moneyLong){
     return format(numberFormat.format(moneyLong));
    }

    public String format(Number moneyNum){
     return format(numberFormat.format(moneyNum));
    }

    private String convertToChineseNumber(String moneyStr){
     String result;
     StringBuffer cMoneyStringBuffer =new StringBuffer();
     for(int i=0;i<moneyStr.length();i++){
      cMoneyStringBuffer.append(chineseNumberMap.
       get(moneyStr.substring(i,i+1)));
     }

     int indexOfDot=cMoneyStringBuffer.indexOf(DOT);
     int moneyPatternCursor=1;
     for(int i=indexOfDot-1;i>0;i--){
      cMoneyStringBuffer.insert(i,
          chineseMoenyPattern.get(EMPTY+moneyPatternCursor));
      moneyPatternCursor=moneyPatternCursor==8?1:moneyPatternCursor+1;
     }

     String fractionPart=cMoneyStringBuffer.substring(
      cMoneyStringBuffer.indexOf("."));
        cMoneyStringBuffer.delete(cMoneyStringBuffer.indexOf("."),cMoneyStringBuffer.length());
        while(cMoneyStringBuffer.indexOf("零拾")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零拾"),cMoneyStringBuffer.indexOf("零拾")+2,ZERO);
        }
        while(cMoneyStringBuffer.indexOf("零佰")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零佰"),cMoneyStringBuffer.indexOf("零佰")+2,ZERO);
        }
        while(cMoneyStringBuffer.indexOf("零仟")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零仟"),cMoneyStringBuffer.indexOf("零仟")+2,ZERO);
        }
        while(cMoneyStringBuffer.indexOf("零万")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零万"),cMoneyStringBuffer.indexOf("零万")+2,TEN_THOUSAND);
        }
        while(cMoneyStringBuffer.indexOf("零亿")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零亿"),cMoneyStringBuffer.indexOf("零亿")+2,HUNDRED_MILLION);
        }
        while(cMoneyStringBuffer.indexOf("零零")!=-1){
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零零"),cMoneyStringBuffer.indexOf("零零")+2,ZERO);
        }
        if(cMoneyStringBuffer.lastIndexOf(ZERO)==cMoneyStringBuffer.length()-1){
         cMoneyStringBuffer.delete(cMoneyStringBuffer.length()-1,cMoneyStringBuffer.length());
        }
        cMoneyStringBuffer.append(fractionPart);
        result=cMoneyStringBuffer.toString();
        return result;
    }

    private String addUnitsToChineseMoenyString(String moneyStr){
     String result;
     StringBuffer cMoneyStringBuffer=new StringBuffer(moneyStr);

     int indexOfDot=cMoneyStringBuffer.indexOf(DOT);
     cMoneyStringBuffer.replace(indexOfDot,indexOfDot+1,YUAN);
     cMoneyStringBuffer.insert(cMoneyStringBuffer.length()-1,JIAO);
     cMoneyStringBuffer.insert(cMoneyStringBuffer.length(),FEN);

      //拾佰仟万亿等都是汉字里面才有的单位，加上它们
     if(cMoneyStringBuffer.indexOf("零角零分")!=-1)//去掉零头，加整
      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零角零分"),cMoneyStringBuffer.length(),"整");
     else if(cMoneyStringBuffer.indexOf("零分")!=-1)//去掉零分，加整
         cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零分"),
cMoneyStringBuffer.length(),"整");
     else if(cMoneyStringBuffer.indexOf("零角")!=-1)
      cMoneyStringBuffer.delete(cMoneyStringBuffer.indexOf("零角"),
           cMoneyStringBuffer.indexOf("零角")+2);
         result=cMoneyStringBuffer.toString();
         return result;
    }

    //检查精度的合法性
    private void checkPrecision(String moneyStr){
     int fractionDigits=moneyStr.length()-moneyStr.indexOf(DOT)-1;
     if(fractionDigits>2)//精度不能比分低
      throw new RuntimeException("金额"+moneyStr+"的小数位数多余两位.");
    }

    public static void main(String[] args){
     System.out.println(getInstance().format(new Double(10010001.01)));
    }

}

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