java-字符串截取及转换为byte数组

字符串截取：

String data = "380000000000000000000000000000000000000000031";

		StringBuffer s1 = new StringBuffer(data);
		int index;
		for (index = 2; index < s1.length(); index += 3) {
			s1.insert(index, ',');
		}
		String[] array = s1.toString().split(",");

                两两一组，可用array[i]来取出其中的数据；

String转byte[]数组：

                byte[] p = null;
		try {
			p = Hex.decodeHex(data.toCharArray());
		} catch (DecoderException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		for (byte b : p) {
			
			System.out.println("byte:"+b);
		}

而，不能使用这种方式来将String字符串转为byte[]；

byte[] bBytes = payload.getBytes();