Rocketmq一个生产者多个消费者的问题

消费者同组时，有两种消息模式。

1.集群模式，多个消费者通过负载均衡一起消费信息

2.广播模式，一个消息会复制成多份分发给每一个消费者

消费者不同组时

一个消息会复制多份发给不同的消费者组

public class SyncProducer {

    public static void main(String[] args) throws Exception{
        //Instantiate with a producer group name
        DefaultMQProducer producer = new DefaultMQProducer("producer_group_01");
        //Specify name server addresses
        producer.setNamesrvAddr("localhost:9876");
        //Launch the instance
        producer.start();
        for(int i = 0; i < 10; i++){
            //Create a message instance, specifying topic, tag and message body.
            Message msg = new Message("TopicTest",
            "TagA",
                    ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET));
            //Call send message to deliver message to one of brokers.
            SendResult sendResult = producer.send(msg);
            System.out.printf("%s%n", sendResult);
            //Shut down once the producer instance is not longer in use.
        }
        producer.shutdown();

    }
}

public class Consumer {

    public static void main(String[] args) throws Exception{
        //Instantiate with specified consumer group name.
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumer_group_01");
        //Specify name server addresses.
        consumer.setNamesrvAddr("localhost:9876");

        //Subscribe one more more topics to consume.
        consumer.subscribe("TopicTest", "*");
        consumer.setMessageModel(MessageModel.BROADCASTING);
        //Register callback to execute on arrival of messages fetched from brokers.
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), list);
                for (MessageExt messageExt : list) {
                    System.out.println("收到消息" + new String(messageExt.getBody()));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        //Launch the consumer instance.
        consumer.start();

        System.out.printf("Consumer Started. %n");

    }
}