ObjectSerializer

public class ObjectSerializer {

    public static String serialize(Serializable obj) throws IOException {
        if (obj == null) return "";
        ByteArrayOutputStream serialObj = new ByteArrayOutputStream();
        ObjectOutputStream objStream = new ObjectOutputStream(serialObj);
        objStream.writeObject(obj);
        objStream.close();
        return encodeBytes(serialObj.toByteArray());
    }

    public static Object deserialize(CharSequence str) throws IOException, ClassNotFoundException {
        if (str == null || str.length() == 0) return null;
        ByteArrayInputStream serialObj = new ByteArrayInputStream(decodeBytes(str));
        ObjectInput objStream = new ObjectInputStream(serialObj);
        return objStream.readObject();
    }

    public static String encodeBytes(byte[] bytes) {
        StringBuilder strBuf = new StringBuilder();

        for (byte aByte : bytes) {
            strBuf.append((char) (((aByte >> 4) & 0xF) + ((int) 'a')));
            strBuf.append((char) (((aByte) & 0xF) + ((int) 'a')));
        }

        return strBuf.toString();
    }

    public static byte[] decodeBytes(CharSequence str) {
        byte[] bytes = new byte[str.length() / 2];
        for (int i = 0; i < str.length(); i+=2) {
            char c = str.charAt(i);
            bytes[i/2] = (byte) ((c - 'a') << 4);
            c = str.charAt(i+1);
            bytes[i/2] += (c - 'a');
        }
        return bytes;
    }

}