教你怎么用Java完成人民币大写转化

<dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

public class ConvertUpMoney {
    //整数部分的人民币大写
    private static final String[] NUMBERS = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
    //数位部分
    private static final String[] IUNIT = {"元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟"};
    //小数部分的人民币大写
    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;
        }
        //判断输入的金额字符串
        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("-", "");
        }
        //如果输入字符串中包含逗号，替换为 "." 
        str = str.replaceAll(",", ".");

        String integerStr;//整数部分数字
        String decimalStr;//小数部分数字


        //分离整数部分和小数部分
        if (str.indexOf(".") > 0) {//整数部分和小数部分
            integerStr = str.substring(0, str.indexOf("."));
            decimalStr = str.substring(str.indexOf(".") + 1);
        } else if (str.indexOf(".") == 0) {//只存在小数部分 .34
            integerStr = "";
            decimalStr = str.substring(1);
        } else { //只存在整数部分 34
            integerStr = str;
            decimalStr = "";
        }

        //整数部分超出计算能力，直接返回
        if (integerStr.length() > IUNIT.length) {
            System.out.println(str + "：超出计算能力");
            return str;
        }

        //整数部分存入数组  目的是为了可以动态的在字符串数组中取对应的值
        int[] integers = toIntArray(integerStr);

        //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 = isWanUnits(integerStr);//设置万单位

        //小数部分数字存入数组
        int[] decimals = toIntArray(decimalStr);

        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) {
        //初始化一维数组长度
        int[] array = new int[number.length()];
        //循环遍历赋值
        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;
        // 对于输入的字符串为 "0." 存入数组后为 0
        if (length == 1 && integers[0] == 0) {
            return "";
        }
        for (int i = 0; i < length; i++) {
            String key = "";//0325464646464
            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) { //角 分 厘   038  壹分捌厘
        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 isWanUnits(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 void test() {
        String number = "1409.50";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//壹仟肆佰零玖元伍角
    }
    @Test
    public void test2() {
        String number = "6007.14";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//陆仟零柒元壹角肆分
    }
    @Test
    public void test3() {
        String number = "1680.32";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//壹仟陆佰捌拾元叁角贰分
    }
    @Test
    public void test4() {
        String number = "107000.53";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//壹拾万零柒仟元伍角叁分
    }
    @Test
    public void test5() {
        String number = "16409.02";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//壹万陆仟肆佰零玖元零贰分
    }
    @Test
    public void test6() {
        String number = "325.04";
        String afterStr = ConvertUpMoney.toChinese(number);
        System.out.println(number + ": " + afterStr);//叁佰贰拾伍元零肆分
    }

    @Test
    public void test7() {
        String number = "-0325.04";
        String afterStr = ConvertUpMoney.toChinese(number);//抱歉，请输入数字！
        System.out.println(number + ": " + afterStr);
    }

    @Test
    public void test8() {
        String number = "325#sdr";
        String afterStr = ConvertUpMoney.toChinese(number);//抱歉，请输入数字！
        System.out.println(number + ": " + afterStr);//325#sdr: 325#sdr
    }

    @Test
    public void test9() {
        String number = "-34327987";
        String afterStr = ConvertUpMoney.toChinese(number);//-34327987: 负叁仟肆佰叁拾贰万柒仟玖佰捌拾柒元
        System.out.println(number + ": " + afterStr);
    }

    @Test
    public void test10() {
        String number = "78934029675923532";
        System.out.println("长度 :" + number.length());//长度 :17
        String afterStr = ConvertUpMoney.toChinese(number);//78934029675923532：超出计算能力
        System.out.println(number + ": " + afterStr);
    }