java金额数字转中文工具类详解

package light.mvc.utils;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
/**
 * 金额数字转中文工具类
 * 
 * @author ardo
 * 
 */
public class ConvertNum {
 
 /**
 * 把金额阿拉伯数字转换为汉字表示，小数点后四舍五入保留两位
 * 还有一种方法可以在转换的过程中不考虑连续0的情况，然后对最终的结果进行一次遍历合并连续的零
 */
 public static String[] ChineseNum = new String[] { "零", "壹", "贰", "叁", "肆",
  "伍", "陆", "柒", "捌", "玖" };
 
 public static String NumToChinese(double num) {
 if (num > 99999999999999.99 || num < -99999999999999.99)
  throw new IllegalArgumentException(
   "参数值超出允许范围 (-99999999999999.99 ～ 99999999999999.99)！");
 boolean negative = false;// 正负标号
 if (num < 0) {
  negative = true;
  num = num * (-1);
 }
 long temp = Math.round(num * 100);
 int numFen = (int) (temp % 10);// 分
 temp = temp / 10;
 int numJiao = (int) (temp % 10);// 角
 temp = temp / 10;
 // 此时temp只包含整数部分
 int[] parts = new int[20];// 将金额整数部分分为在0-9999之间数的各个部分
 int numParts = 0;// 记录把原来金额整数部分分割为几个部分
 for (int i = 0;; i++) {
  if (temp == 0)
  break;
  int part = (int) (temp % 10000);
  parts[i] = part;
  temp = temp / 10000;
  numParts++;
 }
 boolean beforeWanIsZero = true;// 标志位，记录万的下一级是否为0
 String chineseStr = "";
 for (int i = 0; i < numParts; i++) {
  String partChinese = partConvert(parts[i]);
  if (i % 2 == 0) {
  if ("".equals(partChinese))
   beforeWanIsZero = true;
  else
   beforeWanIsZero = false;
  }
  if (i != 0) {
  if (i % 2 == 0)// 亿的部分
   chineseStr = "亿" + chineseStr;
  else {
   if ("".equals(partChinese) && !beforeWanIsZero)// 如果“万”对应的
         // part 为
         // 0，而“万”下面一级不为
         // 0，则不加“万”，而加“零”
   chineseStr = "零" + chineseStr;
   else {
   if (parts[i - 1] < 1000 && parts[i - 1] > 0)// 如果万的部分不为0，而万前面的部分小于1000大于0，则万后面应该跟零
    chineseStr = "零" + chineseStr;
   chineseStr = "万" + chineseStr;
   }
  }
  }
  chineseStr = partChinese + chineseStr;
 }
 if ("".equals(chineseStr))// 整数部分为0，则表示为零元
  chineseStr = ChineseNum[0];
 else if (negative)// 整数部分部位0，但是为负数
  chineseStr = "负" + chineseStr;
 chineseStr = chineseStr + "元";
 if (numFen == 0 && numJiao == 0) {
  chineseStr = chineseStr + "整";
 } else if (numFen == 0) {// 0分
  chineseStr = chineseStr + ChineseNum[numJiao] + "角";
 } else {
  if (numJiao == 0)
  chineseStr = chineseStr + "零" + ChineseNum[numFen] + "分";
  else
  chineseStr = chineseStr + ChineseNum[numJiao] + "角"
   + ChineseNum[numFen] + "分";
 }
 return chineseStr;
 }
 
 // 转换拆分后的每个部分，0-9999之间
 public static String partConvert(int partNum) {
 if (partNum < 0 || partNum > 10000) {
  throw new IllegalArgumentException("参数必须是大于等于0或小于10000的整数");
 }
 String[] units = new String[] { "", "拾", "佰", "仟" };
 int temp = partNum;
 String partResult = new Integer(partNum).toString();
 int partResultLength = partResult.length();
 boolean lastIsZero = true;// 记录上一位是否为0
 String chineseStr = "";
 for (int i = 0; i < partResultLength; i++) {
  if (temp == 0)// 高位无数字
  break;
  int digit = temp % 10;
  if (digit == 0) {
  if (!lastIsZero)// 如果前一个数字不是0则在当前汉字串前加零
   chineseStr = "零" + chineseStr;
  lastIsZero = true;
  } else {
  chineseStr = ChineseNum[digit] + units[i] + chineseStr;
  lastIsZero = false;
  }
  temp = temp / 10;
 }
 return chineseStr;
 }
 
 public static void main(String args[]) {
 double num = 0;
 System.out.println("请输入金额数字,-1退出");
 try {
  BufferedReader br = new BufferedReader(new InputStreamReader(
   System.in));
  num = Double.parseDouble(br.readLine());
 } catch (IOException e) {
  System.out.println(e.toString());
 }
 while (num != -1) {
  System.out.println(num + NumToChinese(num));
  try {
  BufferedReader br = new BufferedReader(new InputStreamReader(
   System.in));
  num = Double.parseDouble(br.readLine());
  } catch (IOException e) {
  System.out.println(e.toString());
  }
 }
 System.out.println("其他测试：");
 System.out.println("100120: " + NumToChinese(100120));
 System.out.println("25000000000005.999: "
  + NumToChinese(25000000000005.999));
 System.out.println("45689263.626: " + NumToChinese(45689263.626));
 System.out.println("0.69457: " + NumToChinese(0.69457));
 System.out.println("253.0: " + NumToChinese(253.0));
 System.out.println("0: " + NumToChinese(0));
 }
}