简介
将阿拉伯数字转换成中文大写,如将123.45转换成壹佰贰拾叁元肆角伍分。
代码实现
import java.util.regex.Pattern;
public class CurrencyUtil {
private CurrencyUtil() {
}
//无效字符
private static final Pattern INVALID_CHARACTER = Pattern.compile("[^,.\d]");
//有效数字格式
private static final Pattern VALID_DIGIT = Pattern
.compile("^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$");
//最大值999亿多
private static final double MAXIMUM_NUMBER = 99999999999.99;
//货币符号
private static final String CN_ZERO = "零";
private static final String CN_ONE = "壹";
private static final String CN_TWO = "贰";
private static final String CN_THREE = "叁";
private static final String CN_FOUR = "肆";
private static final String CN_FIVE = "伍";
private static final String CN_SIX = "陆";
private static final String CN_SEVEN = "柒";
private static final String CN_EIGHT = "捌";
private static final String CN_NINE = "玖";
private static final String CN_TEN = "拾";
private static final String CN_HUNDRED = "佰";
private static final String CN_THOUSAND = "仟";
private static final String CN_TEN_THOUSAND = "万";
private static final String CN_HUNDRED_MILLION = "亿";
private static final String CN_DOLLAR = "元";
private static final String CN_TEN_CENT = "角";
private static final String CN_CENT = "分";
private static final String CN_INTEGER = "整";
//整数 0-9
private static final String[] DIGITS = {
CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE};
//基数 百 千
private static final String[] RADICES = {"", CN_TEN, CN_HUNDRED, CN_THOUSAND};
//大基数 万 亿
private static final String[] BIGRADICES = {"", CN_TEN_THOUSAND, CN_HUNDRED_MILLION};
//小数 角 分
private static final String[] DECIMALS = {CN_TEN_CENT, CN_CENT};
private static String convertCurrency(String currencyDigits) {
if (currencyDigits == null || currencyDigits.length() == 0) {
System.out.println("不能为空");
return "";
}
//字符串中不能包含除了逗号点号和数字的其他字符
if (INVALID_CHARACTER.matcher(currencyDigits).matches()) {
System.out.println("包含无效字符");
return "";
}
if (!VALID_DIGIT.matcher(currencyDigits).matches()) {
System.out.println("数字格式错误");
return "";
}
//移除所有的逗号
currencyDigits = currencyDigits.replaceAll(",", "");
//移除所有的前导零
currencyDigits = currencyDigits.replaceAll("^0+", "");
// Assert the number is not greater than the maximum number.
if (Double.parseDouble(currencyDigits) > MAXIMUM_NUMBER) {
return "";
}
//根据点号分割成两部分整数和小数
String[] parts = currencyDigits.split("\.");
//整数
String integral;
//小数
String decimal;
if (parts.length > 1) {
integral = parts[0];
decimal = parts[1];
//小数最多保留2位
if (decimal.length() >= 2) {
decimal = decimal.substring(0, 2);
} else {
decimal = decimal.substring(0, 1);
}
} else {
integral = parts[0];
decimal = "";
}
StringBuilder outputCharacters = new StringBuilder();
//处理整数
if (Integer.parseInt(integral) > 0) {
int zeroCount = 0;
for (int i = 0; i < integral.length(); i++) {
int p = integral.length() - i - 1;
int d = integral.charAt(i) - '0';
int quotient = p / 4;
int modulus = p % 4;
if (d == 0) {
zeroCount++;
} else {
if (zeroCount > 0) {
outputCharacters.append(DIGITS[0]);
}
zeroCount = 0;
outputCharacters.append(DIGITS[d]).append(RADICES[modulus]);
}
if (modulus == 0 && zeroCount < 4) {
outputCharacters.append(BIGRADICES[quotient]);
}
}
outputCharacters.append(CN_DOLLAR);
}
//处理小数
if (!decimal.isEmpty()) {
for (int i = 0; i < decimal.length(); i++) {
int d = decimal.charAt(i) - '0';
int ds = decimal.charAt(decimal.length() - 1) - '0';
if (d == 0) {
if (ds != 0) {
outputCharacters.append(DIGITS[d]);
}
} else {
outputCharacters.append(DIGITS[d]).append(DECIMALS[i]);
}
}
}
if (outputCharacters.length() == 0) {
outputCharacters.append(CN_ZERO).append(CN_DOLLAR);
}
if (decimal.isEmpty()) {
outputCharacters.append(CN_INTEGER);
}
return outputCharacters.toString();
}
public static void main(String[] args) {
System.out.println(convertCurrency("12.045"));
}
}
最大支持999亿,支持小数。