java数字转汉字工具类详解

/** * Created by 33303 on 2017/7/28. */import java.math.BigDecimal;/** * 数字转换为汉语中人民币的大写<br> * */public class NumberToCN { /** * 汉语中数字大写 */ private static final String[] CN_UPPER_NUMBER = { "零", "壹", "贰", "叁", "肆",  "伍", "陆", "柒", "捌", "玖" }; /** * 汉语中货币单位大写，这样的设计类似于占位符 */ private static final String[] CN_UPPER_MONETRAY_UNIT = { "分", "角", "元",  "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "兆", "拾",  "佰", "仟" }; /** * 特殊字符：整 */ private static final String CN_FULL = "整"; /** * 特殊字符：负 */ private static final String CN_NEGATIVE = "负"; /** * 金额的精度，默认值为2 */ private static final int MONEY_PRECISION = 2; /** * 特殊字符：零元整 */ private static final String CN_ZEOR_FULL = "零元" + CN_FULL; /** * 把输入的金额转换为汉语中人民币的大写 * * @param numberOfMoney *  输入的金额 * @return 对应的汉语大写 */ public static String number2CNMontrayUnit(BigDecimal numberOfMoney) { StringBuffer sb = new StringBuffer(); // -1, 0, or 1 as the value of this BigDecimal is negative, zero, or // positive. int signum = numberOfMoney.signum(); // 零元整的情况 if (signum == 0) {  return CN_ZEOR_FULL; } //这里会进行金额的四舍五入 long number = numberOfMoney.movePointRight(MONEY_PRECISION)  .setScale(0, 4).abs().longValue(); // 得到小数点后两位值 long scale = number % 100; int numUnit = 0; int numIndex = 0; boolean getZero = false; // 判断最后两位数，一共有四中情况：00 = 0, 01 = 1, 10, 11 if (!(scale > 0)) {  numIndex = 2;  number = number / 100;  getZero = true; } if ((scale > 0) && (!(scale % 10 > 0))) {  numIndex = 1;  number = number / 10;  getZero = true; } int zeroSize = 0; while (true) {  if (number <= 0) {  break;  }  // 每次获取到最后一个数  numUnit = (int) (number % 10);  if (numUnit > 0) {  if ((numIndex == 9) && (zeroSize >= 3)) {   sb.insert(0, CN_UPPER_MONETRAY_UNIT[6]);  }  if ((numIndex == 13) && (zeroSize >= 3)) {   sb.insert(0, CN_UPPER_MONETRAY_UNIT[10]);  }  sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]);  sb.insert(0, CN_UPPER_NUMBER[numUnit]);  getZero = false;  zeroSize = 0;  } else {  ++zeroSize;  if (!(getZero)) {   sb.insert(0, CN_UPPER_NUMBER[numUnit]);  }  if (numIndex == 2) {   if (number > 0) {   sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]);   }  } else if (((numIndex - 2) % 4 == 0) && (number % 1000 > 0)) {   sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]);  }  getZero = true;  }  // 让number每次都去掉最后一个数  number = number / 10;  ++numIndex; } // 如果signum == -1，则说明输入的数字为负数，就在最前面追加特殊字符：负 if (signum == -1) {  sb.insert(0, CN_NEGATIVE); } // 输入的数字小数点后两位为"00"的情况，则要在最后追加特殊字符：整 if (!(scale > 0)) {  sb.append(CN_FULL); } return sb.toString(); } public static void main(String[] args) { double money = 2020004.01; BigDecimal numberOfMoney = new BigDecimal(money); String s = NumberToCN.number2CNMontrayUnit(numberOfMoney); System.out.println("你输入的金额为：【"+ money +"】 #--# [" +s.toString()+"]"); }}