Java实现 将数字金额转为大写中文金额

/**
 *@Title: ConvertUpMoney 
 * @Description:  将数字金额转为大写汉字金额
 * @date: 2019年6月18日 下午10:52:27
 */
public class ConvertUpMoney {
	
	//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"};
	
	//转成中文的大写金额
	public static String toChinese(String str) {
		//判断输入的金额字符串是否符合要求
		if (StringUtils.isBlank(str) || !str.matches("(-)?[\\d]*(.)?[\\d]*")) {
			System.out.println("抱歉，请输入数字！");
			return str;
		}
		
		if("0".equals(str) || "0.00".equals(str) || "0.0".equals(str)) {
			return "零元";
		}
		
		//判断是否存在负号"-"
		boolean flag = false;
		if(str.startsWith("-")){
			flag = true;
			str = str.replaceAll("-", "");
		}
		
		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 = "";
		}
		
		//beyond超出计算能力，直接返回
		if(integerStr.length()>IUNIT.length) {
			System.out.println(str+"：超出计算能力");
			return str;
		}
		
		int[] integers = toIntArray(integerStr);//整数部分数字
		//判断整数部分是否存在输入012的情况
		if (integers.length>1 && integers[0] == 0) {
			System.out.println("抱歉，请输入数字！");
			if (flag) {
				str = "-"+str;
			}
			return str;
		}
		boolean isWan = isWan5(integerStr);//设置万单位
		int[] decimals = toIntArray(decimalStr);//小数部分数字
		String result = getChineseInteger(integers,isWan)+getChineseDecimal(decimals);//返回最终的大写金额
		if(flag){
			return "负"+result;//如果是负数，加上"负"
		}else{
			return result;
		}
	}
	
	//将字符串转为int数组
	private static int[] toIntArray(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;
	}
	//将整数部分转为大写的金额
	public static String getChineseInteger(int[] integers,boolean isWan) {
		StringBuffer chineseInteger = new StringBuffer("");
		int length = integers.length;
		if (length == 1 && integers[0] == 0) {
			return "";
		}
		for(int i=0;i<length;i++) {
			String key = "";
			if(integers[i] == 0) {
				if((length - i) == 13)//万（亿）
					key = IUNIT[4];
				else if((length - i) == 9) {//亿
					key = IUNIT[8];
				}else if((length - i) == 5 && isWan) {//万
					key = IUNIT[4];
				}else if((length - i) == 1) {//元
					key = IUNIT[0];
				}
				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();
	}
	//将小数部分转为大写的金额
	private static String getChineseDecimal(int[] decimals) {
		StringBuffer chineseDecimal = new StringBuffer("");
		for(int i = 0;i<decimals.length;i++) {
			if(i == 3) {
				break;
			}
			chineseDecimal.append(decimals[i]==0?"":(NUMBERS[decimals[i]]+DUNIT[i]));
		}
		return chineseDecimal.toString();
	}
	//判断当前整数部分是否已经是达到【万】
	private static boolean isWan5(String integerStr) {
		int length = integerStr.length();
		if(length > 4) {
			String subInteger = "";
			if(length > 8) {
				subInteger = integerStr.substring(length- 8,length -4);
			}else {
				subInteger = integerStr.substring(0,length - 4);
			}
			return Integer.parseInt(subInteger) > 0;
		}else {
			return false;
		}
	}
	
	//Test
	public static void main(String[] args) {
		String number = "12.56";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "1234567890563886.123";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "1600";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "156,0";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "-156,0";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "0.12";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "0.0";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "01.12";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "0125";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "-0125";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		number = "sdw5655";
		System.out.println(number+": "+ConvertUpMoney.toChinese(number));
		
		System.out.println(null+": "+ConvertUpMoney.toChinese(null));
	}
 
}