JAVA BigDecimal数字转换成人民币及格式化

JAVA BigDecimal数字转换成人民币及格式化

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.NumberFormat;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * @Description: 数字转中文人民币工具类
 * @author: mingbiao
 */
public class NumberToRmbUtil {
	private static final Logger LOGGER = LoggerFactory.getLogger(NumberToRmbUtil.class);

	private static final String[] RMB_ARR = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
	private static final String[] UNIT_ARR = { "", "十", "佰", "仟" };
	private static final String[] HIGH_UINIT_ARR = { "", "万", "亿" };
	private static final String[] LOW_UNIT_ARR = { "角", "分" };
	private static final String RMB_UNIT = "元";
	private static final String RMB_INTEGER = "整";
	private static final String ZERO_STR = "0";
	private static final String DOUBLE_ZERO_STR = "00";
	private static final char ZERO_CHR = '0';
	private static final int SCALE = 0;

	private NumberToRmbUtil() {
		throw new IllegalStateException("Utility class");
    }

	/**
	 * BigDecimal类型数据取整数并转为字符串
	 */
	private static String greaterZeroToInt(BigDecimal amount) {
		if (amount == null) {
			return ZERO_STR;
		}
		return amount.divide(new BigDecimal(1), SCALE, RoundingMode.DOWN).toString();
	}

	/**
	 * BigDecimal类型数据取整数
	 */
	private static BigDecimal greaterZeroNum(BigDecimal amount) {
		return amount.divide(new BigDecimal(1), SCALE, RoundingMode.DOWN);
	}

	/**
	 * BigDecimal类型数据取2位小数转为字符串整数，不足2位十位补0
	 */
	private static String lessZeroToInt(BigDecimal amount) {
		String intStr = amount.movePointRight(2).divide(new BigDecimal(1), SCALE, RoundingMode.HALF_UP).toBigInteger()
				.toString();
		if (intStr.length() == 1) {
			return ZERO_STR + intStr;
		}
		return intStr;
	}

	/**
	 * 整数转人民币
	 */
	private static String itoRmbStr(String numStr) {
		StringBuilder result = new StringBuilder();
		if (ZERO_STR.equals(numStr)) {
			return result.toString();
		}
		int len = numStr.length();
                //CommonStatus.MAX_AMOUNT_LIMIT自定义即可
		if (len > CommonStatus.MAX_AMOUNT_LIMIT) {
			LOGGER.error("itoRmbStr={}, len={}", numStr, len);
                //BusinessException自定义即可
			throw new BusinessException(ResultCode.SYS_PARAM_ERROR.getCode(), "数字长度超过系统限制");
		}
		int col = (len - 1) / 4;
		int row = (len - 1) % 4;
		int index = 0;
		LOGGER.info("col = {}, row = {}", col, row);
		for (int i = 0; i <= col; i++) {
			for (int j = 0; j <= row; j++) {
				if (numStr.charAt(index) == ZERO_CHR) {
					if ((numStr.charAt(index - 1) == ZERO_CHR && j != 0) || j == row) {
						index++;
						continue;
					}
					result.append(RMB_ARR[numStr.charAt(index) - ZERO_CHR]);
				} else {
					result.append(RMB_ARR[numStr.charAt(index) - ZERO_CHR]);
					result.append(UNIT_ARR[row - j]);
				}
				index++;
			}
			result.append(HIGH_UINIT_ARR[col - i]);
			row = 3;
		}
		result.append(RMB_UNIT);
		return result.toString();
	}

	/**
	 * 小数转人民币
	 */
	private static String ftoRmbStr(String numStr) {
		String result = "";
		if (numStr.equals(DOUBLE_ZERO_STR) || numStr.equals(ZERO_STR))
			return RMB_INTEGER;
		result += RMB_ARR[numStr.charAt(0) - ZERO_CHR];
		if (numStr.charAt(0) != ZERO_CHR) {
			result += LOW_UNIT_ARR[0];
		}
		result += RMB_ARR[numStr.charAt(1) - ZERO_CHR];
		if (numStr.charAt(1) != ZERO_CHR) {
			result += LOW_UNIT_ARR[1];
		}
		return result;
	}

	/** 
	 * 数字转人民币
	 */
	public static String change(BigDecimal amount) {
		validAmount(amount);
		String greaterZeroToInt = greaterZeroToInt(amount);
		String itoRmbStr = itoRmbStr(greaterZeroToInt);
		BigDecimal lessZeroNum = amount.subtract(greaterZeroNum(amount));
		String lessZeroToInt = lessZeroToInt(lessZeroNum);
		String ftoRmbStr = ftoRmbStr(lessZeroToInt);
		return itoRmbStr + ftoRmbStr;
	}
	
	/** 
	 * 格式化人名币数字为￥12,343,171.60类似格式(带小数位)
	 */
	public static String formatYuan(BigDecimal amount) {
		return formatNumber(amount, 2, 4);
	}
	
	/** 
	 * 格式化人名币数字为￥12,343,171类似格式(不带小数位)
	 */
	public static String formatFen(BigDecimal amount) {
		return formatNumber(amount, 0, 0);
	}
	
	/** 
	 * 格式化人名币数字为￥12343171类似格式(不带小数位且不带分隔符)
	 */
	public static String formatFenNoSymbol(BigDecimal amount) {
		return formatFen(amount).replace(",", "");
	}
	
	/**
	 *  格式化人名币数字
	* @function formatNumber
	* @param amount 金额
	* @param minDigits 设置数的小数部分所允许的最小位数(如果不足后面补0)
	* @param maxDigits 设置数的小数部分所允许的最大位数(如果超过会四舍五入)
	* @return String
	* 
	 */
	private static String formatNumber(BigDecimal amount, int minDigits, int maxDigits) {
		validAmount(amount);
		NumberFormat currency = NumberFormat.getCurrencyInstance();
        currency.setMinimumFractionDigits(minDigits);
        currency.setMaximumFractionDigits(maxDigits);
        return currency.format(amount);
	}
	
	private static void validAmount(BigDecimal amount) {
		if (null == amount) {
			throw new BusinessException(ResultCode.SYS_PARAM_ERROR.getCode(), "数字不可为null");
		}
	}

}