Using roketmq to send a string, why did consumer receive a number?

send:
Message msg = new Message (/ /

                //  Topic Topic 
                "RocketMQ_test_by_bsy",
                // Message Tag,
                //  Gmail  Consumer  MQ 
                "TagA",
                // Message Body
                //  MQ 
                //  Producer  Consumer 
                "Hello MQ".getBytes());

accept:
Consumer consumer = ONSFactory.createConsumer (properties);

    consumer.subscribe("RocketMQ_test_by_bsy", "*", new MessageListener() {
        public Action consume(Message message, ConsumeContext context) {
            System.out.println("Receive: " + message);
            return Action.CommitMessage;
        }
    });
Aug.27,2021
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