public class Num2Rmb {

    private String[] hanArr = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
          private String[] unitArr = { "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟" };

    private String toHanStr(String numStr) {

        String result = "";
        int numLen = numStr.length();

        for (int i = 0; i < numLen; i++) {

            int num = numStr.charAt(i) - 48;

            if (i != numLen - 1 && num != 0) {
                result += hanArr[num] + unitArr[numLen - 2 - i];
            } else {
                result += hanArr[num];
            }
        }
        return result;
    }

    public static void main(String[] args) {
        Num2Rmb nr = new Num2Rmb();
        System.out.println(nr.toHanStr("633779433451"));
        System.out.println(nr.toHanStr("63377"));
    }

}

工具类_java 数字转化为汉字大写