RocketMQTemplate发送带tag的消息

RocketMQUtil

private static Message getAndWrapMessage(String destination, MessageHeaders headers, byte[] payloads) {
	if (destination == null || destination.length() < 1) {
		return null;
	}
	if (payloads == null || payloads.length < 1) {
		return null;
	}
	// 注意这里  topic:tag
	String[] tempArr = destination.split(":", 2);
	String topic = tempArr[0];
	String tags = "";
	if (tempArr.length > 1) { // 冒号后面有值
		tags = tempArr[1];  // tag
	}
	Message rocketMsg = new Message(topic, tags, payloads);
	if (Objects.nonNull(headers) && !headers.isEmpty()) {
		Object keys = headers.get(RocketMQHeaders.KEYS);
		// if headers not have 'KEYS', try add prefix when getting keys
		if (StringUtils.isEmpty(keys)) {
			keys = headers.get(toRocketHeaderKey(RocketMQHeaders.KEYS));
		}
		if (!StringUtils.isEmpty(keys)) { // if headers has 'KEYS', set rocketMQ message key
			rocketMsg.setKeys(keys.toString());
		}
		Object flagObj = headers.getOrDefault("FLAG", "0");
		int flag = 0;
		try {
			flag = Integer.parseInt(flagObj.toString());
		} catch (NumberFormatException e) {
			// Ignore it
			if (log.isInfoEnabled()) {
				log.info("flag must be integer, flagObj:{}", flagObj);
			}
		}
		rocketMsg.setFlag(flag);
		Object waitStoreMsgOkObj = headers.getOrDefault("WAIT_STORE_MSG_OK", "true");
		rocketMsg.setWaitStoreMsgOK(Boolean.TRUE.equals(waitStoreMsgOkObj));
		headers.entrySet().stream()
			.filter(entry -> !Objects.equals(entry.getKey(), "FLAG")
				&& !Objects.equals(entry.getKey(), "WAIT_STORE_MSG_OK")) // exclude "FLAG", "WAIT_STORE_MSG_OK"
			.forEach(entry -> {
				if (!MessageConst.STRING_HASH_SET.contains(entry.getKey())) {
					rocketMsg.putUserProperty(entry.getKey(), String.valueOf(entry.getValue()));
				}
			});

	}
	return rocketMsg;
}

结论

# 指定tag
destination = ${topic}:${tag}