金额转换，阿拉伯数字的金额转换成中国传统的形式如：（￥1011）－>（一千零一拾一元整）输出。

package cn.itcast.framework.interview;

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

//金额转换，阿拉伯数字的金额转换成中国传统的形式如：（￥1011）－>（一千零一拾一元整）输出。
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 chineseMoneyPattern = new HashMap();
	private NumberFormat numberFormat = NumberFormat.getInstance();
	
	private SimpleMoneyFormat(){
		numberFormat.setMaximumFractionDigits(4);
		numberFormat.setMinimumFractionDigits(2);
		numberFormat.setGroupingUsed(false);
		chineseNumberMap.put("0", ZERO);
		chineseNumberMap.put("1", ONE);
		chineseNumberMap.put("2", TWO);
		chineseMoneyPattern.put("3", THREE);
		chineseMoneyPattern.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);
		
		chineseMoneyPattern.put("1", TEN);
		chineseMoneyPattern.put("2", HUNDRED);
		chineseMoneyPattern.put("3", THOUSAND);
		chineseMoneyPattern.put("4", TEN_THOUSAND);
		chineseMoneyPattern.put("5", TEN);
		chineseMoneyPattern.put("6", HUNDRED);
		chineseMoneyPattern.put("7", THOUSAND);
		chineseMoneyPattern.put("8", HUNDRED_MILLION);
	}
	
	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 = addUnitsToChineseMoneyString(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)));
		}
		//拾佰仟万亿等都是汉字里面才有的单位，加上它们
		int indexOfDot = cMoneyStringBuffer.indexOf(DOT);
		int moneyPatternCursor = 1;
		for(int i=indexOfDot-1;i>0;i--){
			cMoneyStringBuffer.insert(i,chineseMoneyPattern.get(EMPTY+moneyPatternCursor));
			moneyPatternCursor = moneyPatternCursor == 8?1:moneyPatternCursor+1;
		}
		String fractionPat = 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(fractionPat);
			result = cMoneyStringBuffer.toString();
		return result;
	}
	
	private String addUnitsToChineseMoneyString(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);
		if (cMoneyStringBuffer.indexOf("零角零分") != -1)//没有零头，加整
		cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf("零角零分"), cMoneyStringBuffer.length(), "整");
		else
		if (cMoneyStringBuffer.indexOf("零分") != -1)//没有零分，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);
		// tmpBuffer.append("整");
		}
		result = cMoneyStringBuffer.toString();
		return result;
	}
	
	private void checkPrecision(String moneyStr){
		int fractionDigits = moneyStr.length()-moneyStr.indexOf(DOT)-1;
		if(fractionDigits>2)
			throw new RuntimeException("金额"+moneyStr+"的小数位多于两位。");//精度不能比分低
	}
	
	public static void main(String [] args){
		System.out.println(getInstance().format(new Double(100100001.01)));
	}
	
}

结果如下：

壹亿零壹拾万零壹元壹分