這兩天寫Android遇到了進制的編解碼問題，記錄一下Byte數(shù)組與十六進制互轉(zhuǎn)。

Byte數(shù)組轉(zhuǎn)十六進制

public static String byte2HexString(byte[] bytes) {
        String hex = "";
        if (bytes != null) {
            for (Byte b : bytes) {
                hex += String.format("%02X", b.intValue() & 0xFF);
            }
        }
        return hex;
    }

十六進制轉(zhuǎn)Byte數(shù)組

public static byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        try {
            for (int i = 0; i < len; i += 2) {
                data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                        + Character.digit(s.charAt(i+1), 16));
            }
        } catch (Exception e) {
           // Log.d("", "Argument(s) for hexStringToByteArray(String s)"+ "was not a hex string");
        }
        return data;
    }