字节数组转16进制字符串

简单记录下如何讲字节数组转成16进制字符串

public static String Bytes2HexString(byte[] b) {
        StringBuilder ret = new StringBuilder();
        for (byte value : b) {
            String hex = Integer.toHexString(value & 0xFF);// 将高24位置0
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            ret.append(hex.toUpperCase());
        }
        return ret.toString();
    }