Java金额转换工具类

package com.healthy.prms.common.util;

import java.math.BigDecimal;

/**
 * @ClassName: RMBUtils
 * @Description: 金额元分之间转换工具类
 */
public class RMBUtils {
	
	private RMBUtils() {}
	
	/** 金额为分的格式 */
	public static final String CURRENCY_FEN_REGEX = "\\-?[0-9]+";

	private static String HanDigiStr[] = new String[] { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };

	private static String HanDiviStr[] = new String[] { "", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "万",
			"拾", "佰", "仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟" };

	/**
	 * @Title: numToRMBStr 
	 * @Description: 将货币转换为大写形式
	 * @param val	  传入的数据
	 * @return: String	返回的人民币大写形式字符串
	 */
	public static final String numToRMBStr(double val) {
		String SignStr = "";
		String TailStr = "";
		long fraction, integer;
		int jiao, fen;
		if (val < 0) {
			val = -val;
			SignStr = "负";
		}
		if (val > 99999999999999.999 || val < -99999999999999.999) {
			return "数值位数过大!";
		}
		// 四舍五入到分
		long temp = Math.round(val * 100);
		integer = temp / 100;
		fraction = temp % 100;
		jiao = (int) fraction / 10;
		fen = (int) fraction % 10;
		if (jiao == 0 && fen == 0) {
			TailStr = "整";
		} else {
			TailStr = HanDigiStr[jiao];
			if (jiao != 0) {
				TailStr += "角";
			}
			// 零元后不写零几分
			if (integer == 0 && jiao == 0) {
				TailStr = "";
			}
			if (fen != 0) {
				TailStr += HanDigiStr[fen] + "分";
			}
		}
		// 下一行可用于非正规金融场合，0.03只显示“叁分”而不是“零元叁分”
		return SignStr + PositiveIntegerToHanStr(String.valueOf(integer)) + "元" + TailStr;
	}

	/**
	 * @Title: PositiveIntegerToHanStr 
	 * @Description: 将货币转换为大写形式(类内部调用)	输入字符串必须正整数，只允许前导空格(必须右对齐)，不宜有前导零
	 * @param NumStr
	 * @return: String
	 */
	private static String PositiveIntegerToHanStr(String NumStr) {
		// 输入字符串必须正整数，只允许前导空格(必须右对齐)，不宜有前导零
		String RMBStr = "";
		boolean lastzero = false;
		boolean hasvalue = false; // 亿、万进位前有数值标记
		int len, n;
		len = NumStr.length();
		if (len > 15) {
			return "数值过大!";
		}
		for (int i = len - 1; i >= 0; i--) {
			if (NumStr.charAt(len - i - 1) == ' ') {
				continue;
			}
			n = NumStr.charAt(len - i - 1) - '0';
			if (n < 0 || n > 9) {
				return "输入含非数字字符!";
			}
			if (n != 0) {
				if (lastzero) {
					RMBStr += HanDigiStr[0]; // 若干零后若跟非零值，只显示一个零
				}
				// 除了亿万前的零不带到后面
				// 如十进位前有零也不发壹音用此行
				if (!(n == 1 && (i % 4) == 1 && i == len - 1)) { // 十进位处于第一位不发壹音
					RMBStr += HanDigiStr[n];
				}
				RMBStr += HanDiviStr[i]; // 非零值后加进位，个位为空
				hasvalue = true; // 置万进位前有值标记
			} else {
				if ((i % 8) == 0 || ((i % 8) == 4 && hasvalue)) // 亿万之间必须有非零值方显示万
					RMBStr += HanDiviStr[i]; // “亿”或“万”
			}
			if (i % 8 == 0) {
				hasvalue = false; // 万进位前有值标记逢亿复位
			}
			lastzero = (n == 0) && (i % 4 != 0);
		}
		if (RMBStr.length() == 0) {
			return HanDigiStr[0]; // 输入空字符或"0"，返回"零"
		}
		return RMBStr;
	}

	/**
	 * @Title: changeF2Y
	 * @Description: 将分为单位的转换为元并返回金额格式的字符串 （除100）
	 * @param amount
	 * @throws Exception
	 * @return: String
	 */
	public static String changeF2Y(Long amount) throws Exception {
		if (!amount.toString().matches(CURRENCY_FEN_REGEX)) {
			throw new Exception("金额格式有误");
		}

		int flag = 0;
		String amString = amount.toString();
		if (amString.charAt(0) == '-') {
			flag = 1;
			amString = amString.substring(1);
		}
		StringBuffer result = new StringBuffer();
		if (amString.length() == 1) {
			result.append("0.0").append(amString);
		} else if (amString.length() == 2) {
			result.append("0.").append(amString);
		} else {
			String intString = amString.substring(0, amString.length() - 2);
			for (int i = 1; i <= intString.length(); i++) {
				if ((i - 1) % 3 == 0 && i != 1) {
					result.append(",");
				}
				result.append(intString.substring(intString.length() - i, intString.length() - i + 1));
			}
			result.reverse().append(".").append(amString.substring(amString.length() - 2));
		}
		if (flag == 1) {
			return "-" + result.toString();
		} else {
			return result.toString();
		}
	}

	/**
	 * @Title: changeF2Y
	 * @Description: 将分为单位的转换为元 （除100）
	 * @param amount
	 * @throws Exception
	 * @return: String
	 */
	public static String changeF2Y(String amount) throws Exception {
		if (!amount.matches(CURRENCY_FEN_REGEX)) {
			throw new Exception("金额格式有误");
		}
		return BigDecimal.valueOf(Long.valueOf(amount)).divide(new BigDecimal(100)).toString();
	}

	/**
	 * @Title: changeY2F
	 * @Description: 将元为单位的转换为分 （乘100）
	 * @param amount
	 * @return: String
	 */
	public static String changeY2F(Long amount) {
		return BigDecimal.valueOf(amount).multiply(new BigDecimal(100)).toString();
	}

	/**
	 * @Title: changeY2F
	 * @Description: 将元为单位的转换为分 替换小数点，支持以逗号区分的金额
	 * @param amount
	 * @return: String
	 */
	public static String changeY2F(String amount) {
		String currency = amount.replaceAll("\\$|\\￥|\\,", ""); // 处理包含, ￥ 或者$的金额
		int index = currency.indexOf(".");
		int length = currency.length();
		Long amLong = 0l;
		if (index == -1) {
			amLong = Long.valueOf(currency + "00");
		} else if (length - index >= 3) {
			amLong = Long.valueOf((currency.substring(0, index + 3)).replace(".", ""));
		} else if (length - index == 2) {
			amLong = Long.valueOf((currency.substring(0, index + 2)).replace(".", "") + 0);
		} else {
			amLong = Long.valueOf((currency.substring(0, index + 1)).replace(".", "") + "00");
		}
		return amLong.toString();
	}
}