動機

業務系統開發的報表中經常需要將人民幣數值轉換為大寫，所以江蘇南大先騰java研發框架中寫了一個通用的大寫轉換函式。由於報表的數值一般比較大所以在java開發中不建議使用float或者int型別，請用BigDecimal型別，為了更加方便呼叫函式的引數使用字串型別。

原始碼

    final static private String CNum[]={"零","壹","貳","叄","肆","伍","陸","柒","捌","玖"};
    final static private String CNum2[]={"〇","一","二","三","四","五","六","七","八"
 
,"九"};
    final static private String CBit[]={"","拾","佰","仟"};
          //拾佰仟萬拾佰仟億拾佰仟萬
    /*
     * 將數值大寫
     */
    public static String capitalization(String szNum)
    {
        StringBuilder resstr = new StringBuilder();
        String tmpstr = szNum.trim();
        int sl = tmpstr.length();
        int
 
 sp=0;
        int dotpos = tmpstr.indexOf('.');
        if(dotpos != -1){
            while(sl>1 && tmpstr.charAt(sl-1) == '0') sl--;
            if(tmpstr.charAt(sl-1)=='.') sl--;
            if(sl != tmpstr.length()){
                tmpstr = tmpstr.substring(0,sl);
            }
        }else
 
 dotpos = sl;
        if(sl<1) return CNum[0];
        if(tmpstr.charAt(0) == '-'){
            resstr.append("負");
            sp = 1;
        }
        String integerNum = tmpstr.substring(sp,dotpos-sp);
        String decimalNum ="";
        if(dotpos+1<sl) decimalNum = tmpstr.substring(dotpos+1);
        sl = integerNum.length();
        sp=0; while(sp<sl && integerNum.charAt(sp)=='0') sp++;
        if(sp > 0) integerNum = integerNum.substring(sp);
        int inl = integerNum.length();
        if(inl>0){
            int h = (inl-1) % 4 ;
            int j = (inl-1) / 4 + 1;
            sp=0;
            boolean allzero = false;
            boolean preallzero = false;
            for(;j>0;j--){
                int k=h;
                h = 3;
                boolean preiszero = allzero;
                allzero = true;
                for(;k>=0;k--,sp++){
                    if(integerNum.charAt(sp) == '0')
                        preiszero = true;
                    else{
                        allzero = false;
                        if(preiszero)
                            resstr.append("零");
                        preiszero = false;
                        resstr.append(CNum[(byte) (integerNum.charAt(sp)) - 48]).append(CBit[k]);
                    }
                }// end for k
                if(/*j!=0 &&*/ j % 2 == 0 ){
                    if(!allzero)
                        resstr.append("萬");
                }
                else
                {
                    if(!allzero || !preallzero){
                        int repyi = j/2;
                        for(int i=0; i<repyi; i++)
                            resstr.append("億");
                    }
                }
                preallzero = allzero;
            }//end for j
        }else
            resstr.append("零");

        int dnl = decimalNum.length();
        if(dnl>0){
            resstr.append("點");
            for(int i=0; i<dnl; i++){
                resstr.append(CNum[(byte)(decimalNum.charAt(i))-48]);
            }
        }
        return resstr.toString();
    }
    /*
     * 僅僅是把 0~9 轉換為 "〇","一","二","三","四","五","六","七","八","九"
     */
    public static String uppercaseCN(String szNum)
    {
        StringBuilder resstr = new StringBuilder();
        String tmpstr = szNum.trim();
        int sl = tmpstr.length();
        int sp=0;

        if(sl<1) return CNum2[0];
        for(;sp<sl;sp++)
            if(tmpstr.charAt(sp)>='0' && tmpstr.charAt(sp)<='9')
                resstr.append(CNum2[tmpstr.charAt(sp)-'0']);
            else
                resstr.append(tmpstr.charAt(sp));
        return resstr.toString();
    }


    public static String capitalization(String szNum,final boolean isSimple)
    {
        if (isSimple){
            return uppercaseCN(szNum);
        }
        return capitalization(szNum);
    }

測試程式

public static String rmbDX(String f){
        return NumberBaseOpt.capitalization(
                        (f.indexOf('.')>=0? f.substring(0,f.indexOf('.')):f)) + "元"
        + NumberBaseOpt.capitalization(
                String.valueOf(NumberBaseOpt.getNumByte(f,-1)))+"角"
        + NumberBaseOpt.capitalization(
                String.valueOf(NumberBaseOpt.getNumByte(f,-2)))+"分";
    }

    public static void main(String[] args) {
        System.out.println(rmbDX("123.45"));
        System.out.println(rmbDX("3456700000000089123.45"));
    }

執行結果：

壹佰貳拾叄元肆角伍分
叄佰肆拾伍億億陸仟柒佰萬億零捌萬玖仟壹佰貳拾叄元肆角伍分