RocketMq(六)消息传输方式

在前面的基础上，

一、消息传输方式:在RocketMQ中，可以通过设置消费组的方式实现消息的广播和点对点传输。

1、默认方式:多个消费者轮询消费，若只有一个消费者则全部消费。通过下面的举例可以看到这其实就是点对点模式。

（1）生产者

 @RequestMapping("/sendUser")
    public void sendUser(@RequestBody UserDTO userDTO,int count){
        try{
            String userName = userDTO.getUserName();
            //同步发送多条消息
            for(int i=0;i<=count;i++){
                userDTO.setUserName(userName+i);
                Message msg = new Message(userTopic,userTag, JSON.toJSONString(userDTO).getBytes(StandardCharsets.UTF_8));
                msg.setKeys("key"+i);
                SendResult sendResult = defaultMQProducer.send(msg);
                System.out.println(userDTO.getUserName()+"发送结果:"+sendResult);
            }
}

（2）消费者 :

@Component
public class DefaultMQConsumeListener {
    private static Logger logger = LoggerFactory.getLogger(DefaultMQConsumeListener.class);

    @Value("${mq.groupname}")
    private String groupName;

    @Value("${mq.nameserveraddress}")
    private String nameserveraddress;

    @Value("${mq.user.topic}")
    private String userTopic;

    @Value("${mq.school.topic}")
    private String schoolTopic;

    /**
     * 订阅用户、学校mq
     */
    @PostConstruct
    public void defaultMQProducer(){
        try{
            logger.info("mq producer 配置 start");
            DefaultMQPushConsumer  consumer = new DefaultMQPushConsumer (groupName);
            consumer.setNamesrvAddr(nameserveraddress);
            // 订阅一个或多个Topic,以及Tag来过滤需要消费的消息
            //1、订阅用户消息
            consumer.subscribe(userTopic,"*");
            //consumer.registerMessageListener(new UserListener());
            //2、订阅学校消息
            consumer.subscribe(schoolTopic,"*");
            //consumer.registerMessageListener(new SchoolListener());
            consumer.registerMessageListener(new UserAndSchoolListener());
            //设置消费最大批量消息条数为2
            consumer.setConsumeMessageBatchMaxSize(2);
            consumer.start();
            logger.info("mq producer 配置 end");
        }
        catch (Exception e){
            logger.error("mq consume启动失败,errorMsg={}",e.getMessage(),e);
        }
    }
}

public class UserAndSchoolListener implements MessageListenerConcurrently {
    private static Logger logger = LoggerFactory.getLogger(UserAndSchoolListener.class);

    @Override
    public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
        try{
            logger.info("{}消息条数:{} ", Thread.currentThread().getName(), list.size());
            for(MessageExt message : list){
                String body = new String(message.getBody(), "UTF-8");
                System.out.println("消息:"+body);
            }
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        }catch (Exception e){
            logger.error("接收消息异常{}",e.getMessage(),e);
            return ConsumeConcurrentlyStatus.RECONSUME_LATER;
        }
    }
}

（3）消费者1:配置同（2），打印处加了个区分

 logger.info("{}消息1条数:{} ", Thread.currentThread().getName(), list.size());
            for(MessageExt message : list){
                String body = new String(message.getBody(), "UTF-8");
                System.out.println("消费者-1 :"+body);
            }

访问http://localhost:8888/mqProviderTest/sendMessage/sendUser?count=6

生产者发送成功

张三0发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F0D0000, offsetMsgId=AC1F070900002A9F00000000000709C8, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=1], queueOffset=81]
张三1发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F1F0001, offsetMsgId=AC1F070900002A9F0000000000070ACC, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=0], queueOffset=82]
张三2发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F260002, offsetMsgId=AC1F070900002A9F0000000000070BD0, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=1], queueOffset=82]
张三3发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F2D0003, offsetMsgId=AC1F070900002A9F0000000000070CD4, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=0], queueOffset=83]
张三4发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F370004, offsetMsgId=AC1F070900002A9F0000000000070DD8, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=1], queueOffset=83]
张三5发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F3F0005, offsetMsgId=AC1F070900002A9F0000000000070EDC, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=0], queueOffset=84]
张三6发送结果:SendResult [sendStatus=SEND_OK, msgId=7F0000012BB418B4AAC2509B4F4A0006, offsetMsgId=AC1F070900002A9F0000000000070FE0, messageQueue=MessageQueue [topic=test-mq-user-topic, brokerName=i-8847E0CB, queueId=1], queueOffset=84]

消费者消费

2023-10-16 15:39:15.633  INFO 22376 --- [-mq-groupname_1] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_1消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三1"}
2023-10-16 15:39:15.639  INFO 22376 --- [-mq-groupname_2] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_2消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三3"}
2023-10-16 15:39:15.658  INFO 22376 --- [-mq-groupname_3] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_3消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三5"}

消费者1消费

2023-10-16 15:39:15.623  INFO 7496 --- [-mq-groupname_1] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_1消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三0"}
2023-10-16 15:39:15.630  INFO 7496 --- [-mq-groupname_2] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_2消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三2"}
2023-10-16 15:39:15.647  INFO 7496 --- [-mq-groupname_3] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_3消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三4"}
2023-10-16 15:39:15.664  INFO 7496 --- [-mq-groupname_4] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_4消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三6"}

多次访问，可以看到两个消费者在轮询消费

2、消息的广播:广播模式下，一个消息可以被多个消费者消费，每个消费者都能够接收到该消息的一个副本。实现消息的广播可以通过设置消费组的方式，将消费组的模式设置为广播模式。

consumer.setMessageModel(MessageModel.BROADCASTING);

在两个消费者的配置中都加上这句

生产者发送成功后，两个消费者打印如下

2023-10-16 16:04:01.886  INFO 8260 --- [-mq-groupname_7] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_7消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三0"}
2023-10-16 16:04:01.893  INFO 8260 --- [-mq-groupname_8] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_8消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三1"}
2023-10-16 16:04:01.905  INFO 8260 --- [-mq-groupname_9] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_9消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三2"}
2023-10-16 16:04:01.923  INFO 8260 --- [mq-groupname_10] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_10消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三3"}
2023-10-16 16:04:01.944  INFO 8260 --- [mq-groupname_11] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_11消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三4"}
2023-10-16 16:04:01.946  INFO 8260 --- [mq-groupname_12] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_12消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三5"}
2023-10-16 16:04:01.955  INFO 8260 --- [mq-groupname_13] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_13消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三6"}

2023-10-16 16:04:01.886  INFO 23564 --- [-mq-groupname_7] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_7消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三0"}
2023-10-16 16:04:01.893  INFO 23564 --- [-mq-groupname_8] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_8消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三1"}
2023-10-16 16:04:01.904  INFO 23564 --- [-mq-groupname_9] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_9消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三2"}
2023-10-16 16:04:01.922  INFO 23564 --- [mq-groupname_10] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_10消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三3"}
2023-10-16 16:04:01.944  INFO 23564 --- [mq-groupname_12] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_12消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三5"}
2023-10-16 16:04:01.944  INFO 23564 --- [mq-groupname_11] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_11消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三4"}
2023-10-16 16:04:01.951  INFO 23564 --- [mq-groupname_13] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_13消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三6"}

3、点对点传输:点对点传输模式下，一个消息只能被一个消费者消费，该消费者消费该消息后，其他消费者将无法再次接收到该消息的副本。实现消息的点对点传输可以通过设置消费组的方式，将消费组的模式设置为集群模式。这里将两个消费者设置如下

consumer.setMessageModel(MessageModel.CLUSTERING);

效果同（1）

4、两个消费者一个设置为点对点，一个设置为广播。如我设置消费者-1为广播式

发送者发送成功后，设置为广播式的全部消费，设置为点对点的轮询消费。

2023-10-16 16:11:45.793  INFO 10852 --- [mq-groupname_14] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_14消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三0"}
2023-10-16 16:11:45.806  INFO 10852 --- [mq-groupname_15] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_15消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三2"}
2023-10-16 16:11:45.821  INFO 10852 --- [mq-groupname_16] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_16消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三4"}
2023-10-16 16:11:45.835  INFO 10852 --- [mq-groupname_17] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_17消息条数:1 
消息:{"age":1,"userAccount":"zhangsan","userName":"张三6"}

2023-10-16 16:11:45.793  INFO 3812 --- [mq-groupname_16] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_16消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三0"}
2023-10-16 16:11:45.801  INFO 3812 --- [mq-groupname_17] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_17消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三1"}
2023-10-16 16:11:45.806  INFO 3812 --- [mq-groupname_18] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_18消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三2"}
2023-10-16 16:11:45.813  INFO 3812 --- [mq-groupname_19] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_19消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三3"}
2023-10-16 16:11:45.821  INFO 3812 --- [mq-groupname_20] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_20消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三4"}
2023-10-16 16:11:45.827  INFO 3812 --- [-mq-groupname_3] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_3消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三5"}
2023-10-16 16:11:45.833  INFO 3812 --- [-mq-groupname_6] com.demo.listener.UserAndSchoolListener  : ConsumeMessageThread_test-mq-groupname_6消息1条数:1 
消费者-1 :{"age":1,"userAccount":"zhangsan","userName":"张三6"}