数字转英文.md

使用英文描述数字

代码

/**
 * 将浮点数类型的number转换成英语的表达方式 <br>
 * 参考博客：http://blog.csdn.net/eric_sunah/article/details/8713226
 * 
 * @author Looly
 * @since 3.0.9
 * @see <a href=
 *      "http://blog.csdn.net/eric_sunah/article/details/8713226">http://blog.csdn.net/eric_sunah/article/details/8713226</a>
 */
public class NumberWordFormater {

	private static final String[] NUMBER = new String[] { "", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN",
			"EIGHT", "NINE" };
	private static final String[] NUMBER_TEEN = new String[] { "TEN", "ELEVEN", "TWELEVE", "THIRTEEN", "FOURTEEN",
			"FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN" };
	private static final String[] NUMBER_TEN = new String[] { "TEN", "TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY",
			"SEVENTY", "EIGHTY", "NINETY" };
	private static final String[] NUMBER_MORE = new String[] { "", "THOUSAND", "MILLION", "BILLION" };

	/**
	 * 将阿拉伯数字转为英文表达式
	 * 
	 * @param x
	 *            阿拉伯数字，可以为{@link Number}对象，也可以是普通对象，最后会使用字符串方式处理
	 * @return 英文表达式
	 */
	public static String format(Object x) {
		if (x != null) {
			return format(x.toString());
		} else {
			return "";
		}
	}

	/**
	 * 将阿拉伯数字转为英文表达式
	 * 
	 * @param x
	 *            阿拉伯数字字符串
	 * @return 英文表达式
	 */
	private static String format(String x) {
		int z = x.indexOf("."); // 取小数点位置
		String lstr = "", rstr = "";
		if (z > -1) { // 看是否有小数，如果有，则分别取左边和右边
			lstr = x.substring(0, z);
			rstr = x.substring(z + 1);
		} else {
			// 否则就是全部
			lstr = x;
		}

		String lstrrev = reverse(lstr); // 对左边的字串取反
		String[] a = new String[5]; // 定义5个字串变量来存放解析出来的叁位一组的字串

		switch (lstrrev.length() % 3) {
		case 1:
			lstrrev += "00";
			break;
		case 2:
			lstrrev += "0";
			break;
		}
		String lm = ""; // 用来存放转换後的整数部分
		for (int i = 0; i < lstrrev.length() / 3; i++) {
			a[i] = reverse(lstrrev.substring(3 * i, 3 * i + 3)); // 截取第一个叁位
			if (!a[i].equals("000")) { // 用来避免这种情况：1000000 = one million
										// thousand only
				if (i != 0) {
					lm = transThree(a[i]) + " " + parseMore(String.valueOf(i)) + " " + lm; // 加:
																							// thousand、million、billion
				} else {
					lm = transThree(a[i]); // 防止i=0时， 在多加两个空格.
				}
			} else {
				lm += transThree(a[i]);
			}
		}

		String xs = ""; // 用来存放转换後小数部分
		if (z > -1) {
			xs = "AND CENTS " + transTwo(rstr) + " "; // 小数部分存在时转换小数
		}

		return lm.trim() + " " + xs + "ONLY";
	}

	private static String reverse(String substring) {
		char[] chars = substring.toCharArray();
		int len = chars.length - 1;
		for (int i = 0; i < chars.length / 2; i++) {
			char tmp = chars[i];
			chars[i] = chars[len];
			chars[len] = tmp;
			len--;
		}

		return new String(chars);
	}

	private static String parseFirst(String s) {
		return NUMBER[Integer.parseInt(s.substring(s.length() - 1))];
	}

	private static String parseTeen(String s) {
		return NUMBER_TEEN[Integer.parseInt(s) - 10];
	}

	private static String parseTen(String s) {
		return NUMBER_TEN[Integer.parseInt(s.substring(0, 1)) - 1];
	}

	private static String parseMore(String s) {
		return NUMBER_MORE[Integer.parseInt(s)];
	}

	// 两位
	private static String transTwo(String s) {
		String value = "";
		// 判断位数
		if (s.length() > 2) {
			s = s.substring(0, 2);
		} else if (s.length() < 2) {
			s = "0" + s;
		}

		if (s.startsWith("0")) {// 07 - seven 是否小於10
			value = parseFirst(s);
		} else if (s.startsWith("1")) {// 17 seventeen 是否在10和20之间
			value = parseTeen(s);
		} else if (s.endsWith("0")) {// 是否在10与100之间的能被10整除的数
			value = parseTen(s);
		} else {
			value = parseTen(s) + " " + parseFirst(s);
		}
		return value;
	}

	// 制作叁位的数
	// s.length = 3
	private static String transThree(String s) {
		String value = "";
		if (s.startsWith("0")) {// 是否小於100
			value = transTwo(s.substring(1));
		} else if (s.substring(1).equals("00")) {// 是否被100整除
			value = parseFirst(s.substring(0, 1)) + " HUNDRED";
		} else {
			value = parseFirst(s.substring(0, 1)) + " HUNDRED AND " + transTwo(s.substring(1));
		}
		return value;
	}
}

测试

	@Test
	public void formatTest() {
		String format = NumberWordFormater.format(100.23);
		Assert.assertEquals("ONE HUNDRED AND CENTS TWENTY THREE ONLY", format);
		
		String format2 = NumberWordFormater.format("2100.00");
		Assert.assertEquals("TWO THOUSAND ONE HUNDRED AND CENTS  ONLY", format2);
	}

引用

Hutool NumberWordFormater