// int转byte
	public static byte[] intToBytes(int i) {
        byte[] result = new byte[4];
        result[0] = (byte)((i >> 24) & 0xFF);
        result[1] = (byte)((i >> 16) & 0xFF);
        result[2] = (byte)((i >> 8) & 0xFF);
        result[3] = (byte)(i & 0xFF);
        return result;
    }

// byte转为int
	public static int byteToInt(byte[] bytes) {
		int value = 0;
		for (int i = 0; i < 4; i++) {
			int shift = (3 - i) * 8;
			value += (bytes[i] & 0xFF) << shift;
		}
		return value;
	}