Base64传输字节码转换

public class Base64 {
    public static byte[] deCode(String src)
    {
        if (src.length() < 2)
        {
            return new byte[0];
        }
        byte dest[] = new byte[src.length() / 2];
        Arrays.fill(dest, (byte) 0);
        int index = 0;
        for (int ii = 0; ii < src.length() - 1; ii++)
        {
            String str = "#" + src.substring(ii, ii + 2);
            byte rb = (byte) Integer.decode(str).intValue();
            dest[index++] = rb;
            ii++;
        }

        return dest;
    }

    public static String enCode(byte bsrc[])
    {
        String dest = "";
        if (bsrc == null)
        {
            return "";
        }
        for (int ii = 0; ii < bsrc.length; ii++)
        {
            byte bb = bsrc[ii];
            int num;
            if (bb >= 0)
            {
                num = bb;
            }
            else
            {
                num = (bb & 0x7f) + 128;
            }
            String str = Integer.toHexString(num);
            if (str.length() < 2)
            {
                str = "0" + str;
            }
            dest = dest + str.toUpperCase();
        }

        return dest;
    }
}