[java]飞书机器人签名校验GenSign方法

public String getSign(String timestamp){
    //注意timestamp必须是10位的，秒，不能是毫秒
    // String timestamp=String.valueOf(System.currentTimeMillis()).substring(0,10);
    //这里换成你的secret
        String secret="xxxxxxxxxxxxxx";
        String content=timestamp+"\n"+secret;
        byte[] message1={};
        try {
            Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
            SecretKeySpec secret_key = new SecretKeySpec(content.getBytes(), "HmacSHA256");
            sha256_HMAC.init(secret_key);
            String hash = Base64.encodeBase64String(sha256_HMAC.doFinal(message1));
            System.out.println(hash);
            return hash;
        }catch (Exception e){
            UnifyLogger.info(LogUtil.getLogId(),"加密失败");
        }
        return null;
    }