public static String hmac_sha256(String sessionKey) throws NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException { if (!StringUtils.hasText(sessionKey)) { return null; } SecretKeySpec secretKeySpec = new SecretKeySpec(sessionKey.getBytes(), "HmacSHA256"); Mac mac = Mac.getInstance("HmacSHA256"); mac.init(secretKeySpec); byte[] hmac = mac.doFinal("".getBytes("utf-8")); return Base64.getEncoder().encodeToString(hmac); } [图片]

没有了，只是想找文档，没找到！感谢