编程小技巧阿拉伯数字转中文汉字的Java方法

　　之前做财务相关的系统时，阿拉伯数字需要转换成中文汉字。
　　当时知识储备不足。一直没有满意的方案。
　　今天特意思考这个问题，写下此方法，到目前为止算是最满意的方案了。import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern;  import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.Test;  public class TestNumberToChinese {      @Test     public void testConvertNumberToChinese() {         Assertions.assertArrayEquals(new Object[] { ＂零元＂//                 , ＂零元＂ } //                 , new Object[] { TestNumberToChinese.convertNumberToChinese(＂0＂)//                         , TestNumberToChinese.convertNumberToChinese(＂0.00＂) });     }      public static String convertNumberToChinese(String inputData) {          Map decimalUnit = new HashMap<>();         decimalUnit.put(-2, ＂分＂);         decimalUnit.put(-1, ＂角＂);         decimalUnit.put(1, ＂元＂);         decimalUnit.put(2, ＂拾＂);         decimalUnit.put(3, ＂佰＂);         decimalUnit.put(4, ＂仟＂);         decimalUnit.put(5, ＂万＂);         decimalUnit.put(6, ＂拾＂);// 十万         decimalUnit.put(7, ＂佰＂);// 佰万         decimalUnit.put(8, ＂仟＂);// 仟万         decimalUnit.put(9, ＂亿＂);         decimalUnit.put(10, ＂拾＂);// 十亿         decimalUnit.put(11, ＂佰＂);// 佰亿         decimalUnit.put(12, ＂仟＂);// 仟亿         decimalUnit.put(13, ＂兆＂);         decimalUnit.put(14, ＂拾＂);// 十兆         decimalUnit.put(15, ＂佰＂);// 佰兆         decimalUnit.put(16, ＂仟＂);// 仟兆          List extraUnit = new ArrayList<>();         extraUnit.add(＂万＂);         extraUnit.add(＂亿＂);         extraUnit.add(＂兆＂);          Map unitCount = new HashMap<>();         unitCount.put(0, ＂零＂);         unitCount.put(1, ＂壹＂);         unitCount.put(2, ＂贰＂);         unitCount.put(3, ＂叁＂);         unitCount.put(4, ＂肆＂);         unitCount.put(5, ＂伍＂);         unitCount.put(6, ＂陆＂);         unitCount.put(7, ＂柒＂);         unitCount.put(8, ＂捌＂);         unitCount.put(9, ＂玖＂);          StringBuffer outputBufferData = new StringBuffer();          String integerData = null;         String scaleData = null;          Pattern decimalPattern = Pattern.compile(＂^(d{1,16}).(d{0,2})#34;);         Matcher decimalMatcher = decimalPattern.matcher(inputData);         Pattern integerPattern = Pattern.compile(＂^(d{1,16})#34;);         Matcher integerMatcher = integerPattern.matcher(inputData);         if (decimalMatcher.find()) {// 小数的场合             integerData = decimalMatcher.group(1);             scaleData = decimalMatcher.group(2);         } else if (integerMatcher.matches()) {// 整数的场合             integerData = inputData;         }          // 转换整数         if (integerData != null && integerData != ＂＂) {             for (int k = 0; k < integerData.length(); k++) {                 char inputChar = integerData.charAt(k);                 int currentUnitCount = Character.getNumericValue(inputChar);                 String currentUnit = decimalUnit.get(integerData.length() - k);                 String numToChinese = null;                 if (currentUnitCount == 0) {                     numToChinese = unitCount.get(currentUnitCount);                     if (k == integerData.length() - 1) {                         numToChinese = unitCount.get(currentUnitCount) + currentUnit;                     } else if (extraUnit.contains(currentUnit)) {                         numToChinese = currentUnit;                     }                  } else {                     numToChinese = unitCount.get(currentUnitCount) + currentUnit;                 }                 outputBufferData.append(numToChinese);             }         }         // 转换小数         if (scaleData != null && scaleData != ＂＂) {             for (int k = 0; k < scaleData.length(); k++) {                 char inputChar = scaleData.charAt(k);                 int currentUnitCount = Character.getNumericValue(inputChar);                 String currentUnit = decimalUnit.get(Math.negateExact(k + 1));                 String numToChinese = null;                 if (currentUnitCount == 0) {                     numToChinese = unitCount.get(currentUnitCount);                 } else {                     numToChinese = unitCount.get(currentUnitCount) + currentUnit;                 }                 outputBufferData.append(numToChinese);             }         }          String ouputData = outputBufferData.toString();          // 去除重复的零         ouputData = ouputData.replaceAll(＂(零{2,})＂, ＂＂);         if (!ouputData.equals(＂零元＂)) {             // 去除不合理的单位             ouputData = ouputData.replaceAll(＂^(零元)＂, ＂＂);             ouputData = ouputData.replaceAll(＂(亿万)＂, ＂亿＂);             ouputData = ouputData.replaceAll(＂(兆亿)＂, ＂兆＂);             // 去除首位的零             ouputData = ouputData.replaceAll(＂^(零{1})＂, ＂＂);             // 去除末位的零             ouputData = ouputData.replaceAll(＂(零{1})#34;, ＂＂);         }          return ouputData;     } }