十六进制转成字符串形式与字符串形式转hex

1.计算机只会知道010101的二进制,到底层10进制和16进制还是会转成位数被识别,所以可以通过byte数组去进行转换
private byte[] hexStringToBytes(String hexString) {
		if (hexString == null || hexString.equals("")) {
			return null;
		}
		hexString = hexString.toUpperCase(Locale.getDefault());
		int length = hexString.length() / 2;
		char[] hexChars = hexString.toCharArray();
		byte[] data = new byte[length];
		for (int i = 0; i < length; i++) {
			int pos = i * 2;
			data[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
		}
		return data;
	}	
	// 获取字符串对应的16进制数
	private byte charToByte(char c) {
		return (byte) "0123456789ABCDEF".indexOf(c);
	}



	// 转换HEX为字符串
	private  String changeHexToString(final byte[] buffer, final int size) {
		StringBuffer strbuf = new StringBuffer("");
		if (buffer == null || buffer.length <= 0) {
			return null;
		}
		for (int i = 0; i < size; i++) {
			int temp = buffer[i] & 0xFF;
			String strTemp = Integer.toHexString(temp);
			if (strTemp.length() < 2) {
				strbuf.append(0);
			}
			strbuf.append(strTemp);
		}
		return strbuf.toString();
	}

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