16进制转10进制和2进制

/**
     * 16进制转10进制
     * 
     * @param str
     * @return
     */
    public static String sixteenToTen(String str) {
        int ten = Integer.parseInt(str, 16);
        String result = String.valueOf(ten);
        return result;
    }
    
    /**
     * 16进制转2进制
     * @param str
     * @return
     */
    public static String hexStringTobinaryString(String hexString){
        if(null==hexString||hexString.length()%2!=0){
            return null;
        }
        String bString="";
        String temp="";
        for (int i = 0; i < hexString.length(); i++) {
            temp = "0000"  
                    + Integer.toBinaryString(Integer.parseInt(hexString  
                            .substring(i, i + 1), 16));  
            bString += temp.substring(temp.length() - 4); 
        }
        return bString;
    }