Data amount of money into capital of java tools

1. Background

1.1. Because the needs of the project, the amount of money needs to be converted to uppercase Arab amount of tools directly on the code below.

2.Util

import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class ChineseYuanUtil {
 
    private static final Pattern AMOUNT_PATTERN = Pattern.compile("^(0|[1-9]\\d{0,11})\\.(\\d\\d)$"); // 不考虑分隔符的正确性
    private static final char[] RMB_NUMS = "零壹贰叁肆伍陆柒捌玖".toCharArray();
    private static final String[] UNITS = { "元", "角", "分", "整" };
    private static final String[] U1 = { "", "拾", "佰", "仟" };
    private static final String[] U2 = { "", "万", "亿" };
 
    /**
     * 将金额（整数部分等于或少于 12 位，小数部分 2 位）转换为中文大写形式.
     * 
     * @param amount 金额数字
     * @return 中文大写
     * @throws IllegalArgumentException
     */
    public static String convert(String amount) throws IllegalArgumentException {
        // 去掉分隔符
        amount = amount.replace(",", "");
 
        // 验证金额正确性
        if (amount.equals("0.00")) {
            throw new IllegalArgumentException("金额不能为零.");
        }
        Matcher matcher = AMOUNT_PATTERN.matcher(amount);
        if (!matcher.find()) {
            throw new IllegalArgumentException("输入金额有误.");
        }
 
        String integer = matcher.group(1); // 整数部分
        String fraction = matcher.group(2); // 小数部分
 
        String result = "";
        if (!integer.equals("0")) {
            result += integer2rmb(integer) + UNITS[0]; // 整数部分
        }
        if (fraction.equals("00")) {
            result += UNITS[3]; // 添加[整]
        } else if (fraction.startsWith("0") && integer.equals("0")) {
            result += fraction2rmb(fraction).substring(1); // 去掉分前面的[零]
        } else {
            result += fraction2rmb(fraction); // 小数部分
        }
 
        return result;
    }
 
    // 将金额小数部分转换为中文大写
    private static String fraction2rmb(String fraction) {
        char jiao = fraction.charAt(0); // 角
        char fen = fraction.charAt(1); // 分
        return (RMB_NUMS[jiao - '0'] + (jiao > '0' ? UNITS[1] : ""))
                + (fen > '0' ? RMB_NUMS[fen - '0'] + UNITS[2] : "");
    }
 
    // 将金额整数部分转换为中文大写
    private static String integer2rmb(String integer) {
        StringBuilder buffer = new StringBuilder();
        // 从个位数开始转换
        int i, j;
        for (i = integer.length() - 1, j = 0; i >= 0; i--, j++) {
            char n = integer.charAt(i);
            if (n == '0') {
                // 当 n 是 0 且 n 的右边一位不是 0 时，插入[零]
                if (i < integer.length() - 1 && integer.charAt(i + 1) != '0') {
                    buffer.append(RMB_NUMS[0]);
                }
                // 插入[万]或者[亿]
                if (j % 4 == 0) {
                    if (i > 0 && integer.charAt(i - 1) != '0' || i > 1 && integer.charAt(i - 2) != '0'
                            || i > 2 && integer.charAt(i - 3) != '0') {
                        buffer.append(U2[j / 4]);
                    }
                }
            } else {
                if (j % 4 == 0) {
                    buffer.append(U2[j / 4]); // 插入[万]或者[亿]
                }
                buffer.append(U1[j % 4]); // 插入[拾]、[佰]或[仟]
                buffer.append(RMB_NUMS[n - '0']); // 插入数字
            }
        }
        return buffer.reverse().toString();
    }
}

3. Use Tools

 public static void main(String[] args) {
        System.out.println(ChineseYuanUtil.convert("16,409.02"));
    }

4. Results

壹万陆仟肆佰零玖元零贰分

5. End

Always keep the faith!!!