java decimal 比较数值 java金额比较

package com.gerrard.pmc.util;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

/**
 * 金额工具类
 *
 * @author GERRARD 
 */
public final class MoneyUtil {

	/**
	 * 大写数字 
	 */
	private static final String[] NUMBERS = { "零", "壹", "贰", "叁", "肆", "伍",
			"陆", "柒", "捌", "玖" };

	/**
	 * 整数单位
	 */
	private static final String[] IUNIT = { "元", "拾", "佰", "仟", "万", "拾", "佰",
			"仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟" };

	/**
	 * 小数单位
	 */
	private static final String[] DUNIT = { "角", "分", "厘" };

	/**
	 * 大写金额
	 * @param str
	 * @return
	 */
	public static String toChinese(String str) 
	{
		str = str.replaceAll(",", "");// 去掉","
		
		String integerStr;// 整数部分数字
		
		String decimalStr;// 小数部分数字

		// 初始化：分离整数部分和小数部分
		if (str.indexOf(".") > 0) 
		{
			integerStr = str.substring(0, str.indexOf("."));
			
			decimalStr = str.substring(str.indexOf(".") + 1);
			
		} else if (str.indexOf(".") == 0) 
		{
			integerStr = "";
			decimalStr = str.substring(1);
			
		} else 
		{
			integerStr = str;
			decimalStr = "";
		}
		
		// integerStr去掉首0，不必去掉decimalStr的尾0(超出部分舍去)
		if (!integerStr.equals("")) 
		{
			integerStr = Long.toString(Long.parseLong(integerStr));
			
			if (integerStr.equals("0")) 
			{
				integerStr = "";
			}
		}
		
		// overflow超出处理能力，直接返回
		if (integerStr.length() > IUNIT.length) 
		{
			System.out.println(str + ":超出处理能力");
			return str;
		}

		int[] integers = toArray(integerStr);// 整数部分数字
		
		boolean isMust5 = isMust5(integerStr);// 设置万单位
		
		int[] decimals = toArray(decimalStr);// 小数部分数字
		
		return getChineseInteger(integers, isMust5)
				+ getChineseDecimal(decimals);
	}

	/**
	 * 整数部分和小数部分转换为数组，从高位至低位
	 * @param number
	 * @return
	 */
	private static int[] toArray(String number) 
	{
		int[] array = new int[number.length()];
		
		for (int i = 0; i < number.length(); i++) 
		{
			array[i] = Integer.parseInt(number.substring(i, i + 1));
		}
		return array;
	}

	/**
	 * 中文整数金额
	 * @param integers
	 * @param isMust5
	 * @return
	 */
	private static String getChineseInteger(int[] integers, boolean isMust5) 
	{
		StringBuffer chineseInteger = new StringBuffer("");
		
		int length = integers.length;
		
		for (int i = 0; i < length; i++) 
		{
			// 0出现在关键位置：1234(万)5678(亿)9012(万)3456(元)
			// 特殊情况：10(拾元、壹拾元、壹拾万元、拾万元)
			String key = "";
			
			if (integers[i] == 0) 
			{
				if ((length - i) == 13)// 万(亿)(必填)
				{
					key = IUNIT[4];
				}
					
				else if ((length - i) == 9)// 亿(必填)
				{
					key = IUNIT[8];
				}
					
				else if ((length - i) == 5 && isMust5)// 万(不必填)
				{
					key = IUNIT[4];
				}
					
				else if ((length - i) == 1)// 元(必填) 
				{
					key = IUNIT[0];
				}
					
				// 0遇非0时补零，不包含最后一位
				if ((length - i) > 1 && integers[i + 1] != 0)
				{
					key += NUMBERS[0];
				}
					
			}
			chineseInteger.append(integers[i] == 0 ? key
					: (NUMBERS[integers[i]] + IUNIT[length - i - 1]));
		}
		return chineseInteger.toString();
	}

	/**
	 * 中文小数金额
	 * @param decimals
	 * @return
	 */
	private static String getChineseDecimal(int[] decimals) 
	{
		StringBuffer chineseDecimal = new StringBuffer("");
		
		for (int i = 0; i < decimals.length; i++) 
		{
			// 舍去3位小数之后的
			if (i == 3)
				break;
			
			chineseDecimal.append(decimals[i] == 0 ? ""
					: (NUMBERS[decimals[i]] + DUNIT[i]));
		}
		return chineseDecimal.toString();
	}

	/**
	 * 第五位数字是否加万
	 * @param integerStr
	 * @return
	 */
	private static boolean isMust5(String integerStr) 
	{
		int length = integerStr.length();
		
		if (length > 4) 
		{
			String subInteger = "";
			
			if (length > 8) 
			{
				// 取得从低位数，第5到第8位的字串
				subInteger = integerStr.substring(length - 8, length - 4);
			} else 
			{
				subInteger = integerStr.substring(0, length - 4);
			}
			return Integer.parseInt(subInteger) > 0;
		} else 
		{
			return false;
		}
	}

	/**
	 * 大小写金额比较 支持最小单位：厘
	 * 
	 * @param amount
	 *            小写金额
	 * @param chineseAmount
	 *            大写金额
	 * @return
	 */
	public static boolean isAmtEqChn(String amount, String chineseAmount) {

		if (StringUtils.isBlank(chineseAmount)) 
		{
			return false;
		}

		// 格式化大写金额去整
		chineseAmount = chineseAmount.replace("整", "");
		chineseAmount = chineseAmount.replace("正", "");
		chineseAmount = chineseAmount.replace("人民币", "");

		chineseAmount = toSimplified(chineseAmount);

		String toChnAmt = toChinese(amount);

		if (chineseAmount.equals(toChnAmt)) 
		{
			return true;
		}
		return false;
	}

	/**
	 * 大写金额简体化
	 * 
	 * @param chnAmt
	 * @return
	 */
	public static String toSimplified(String chnAmt) {

		if (StringUtils.isBlank(chnAmt)) 
		{
			return null;
		}

		char[] amtArrChar = chnAmt.toCharArray();

		Map<String, String> mapping = getSimpToTradMapping();

		for (int i = 0; i < amtArrChar.length; i++) 
		{
			if (mapping.containsKey(String.valueOf(amtArrChar[i]))) 
			{
				amtArrChar[i] = mapping.get(String.valueOf(amtArrChar[i]))
						.charAt(0);
			}
		}

		return String.valueOf(amtArrChar);
	}

	/**
	 * 繁体对应
	 * 
	 * @return
	 */
	private static Map<String, String> getSimpToTradMapping() 
	{

		Map<String, String> mapping = new HashMap<String, String>();

		mapping.put("圆", "元");
		mapping.put("圓", "元");
		mapping.put("貳", "贰");
		mapping.put("陸", "陆");
		mapping.put("億", "亿");
		mapping.put("萬", "万");

		return mapping;
	}
	
	public static void main(String[] args) {
		
		String amount = "99999.99";
		
		System.out.println("小写金额" + amount + "转换大写金额:" + toChinese("99999.99"));
		
		String chnAmount = "玖萬玖仟玖佰玖拾玖圓玖角玖分";
		
		System.out.println(chnAmount + "-简体化:" + toSimplified(chnAmount));

		System.out.println("小写金额：" + amount + " 与 大写金额:" + chnAmount + "比较结果--------"+ isAmtEqChn(amount, chnAmount));
	}
}

网上的代码，自己又修改添加了一部分