How does RocketMQ implement message sending and receiving in Springboot?

springboot rockermq implements simple message sending and receiving

There are three ways to send ordinary messages: one-way sending, synchronous sending and asynchronous sending.

Let’s introduce springboot rockermq integration to realize the sending and receiving of ordinary messages

• Create a Springboot project and add rockermq dependency

<!--rocketMq依赖-->
<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-spring-boot-starter</artifactId>
    <version>2.2.1</version>
</dependency>

• Configure rocketmq

# Port
server:
port: 8083

# Configure rocketmq
rocketmq:
name-server: 127.0.0.1:9876
#producer
producer:
#Producer group name, it must be unique in an application
group: group1
#The default timeout for message sending is 3000ms
send-message-timeout: 3000
#When the message reaches 4096 bytes, the message will be compressed. Default 4096
compress-message-body-threshold: 4096
#Maximum message limit, default is 128K
max-message-size: 4194304
#Number of retries for failed synchronization message sending
retry-times-when-send-failed: 3
#Whether to retry other agents when internal sending fails, this parameter will only take effect when there are multiple brokers
retry-next-server: true
# Number of retries for failed asynchronous message sending
retry-times-when-send-async-failed: 3

• Create a new controller to send messages:

package com.example.springbootrocketdemo.controller;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * 普通信息的三种方式：同步、异步、单向
 * @author qzz
 */
@RestController
public class RocketMQCOntroller {
    @Autowired
    private RocketMQTemplate rocketMQTemplate;
    /**
     * 发送普通消息
     * convertAndSend(String destination, Object payload) 发送字符串比较方便
     */
    @RequestMapping("/send")
    public void send(){
        rocketMQTemplate.convertAndSend("test-topic","test-message");
    }
    /**
     * 发送同步消息
     */
    @RequestMapping("/testSyncSend")
    public void testSyncSend(){
        //参数一：topic   如果想添加tag,可以使用"topic:tag"的写法
        //参数二：消息内容
        SendResult sendResult = rocketMQTemplate.syncSend("test-topic","同步消息测试");
        System.out.println(sendResult);
    }
    /**
     * 发送异步消息
     */
    @RequestMapping("/testASyncSend")
    public void testASyncSend(){
        //参数一：topic   如果想添加tag,可以使用"topic:tag"的写法
        //参数二：消息内容
        //参数三：回调
        rocketMQTemplate.asyncSend("test-topic", "异步消息测试", new SendCallback() {
            @Override
            public void onSuccess(SendResult sendResult) {
                System.out.println(sendResult);
            }
            @Override
            public void onException(Throwable throwable) {
                System.out.println("消息发送异常");
                throwable.printStackTrace();
            }
        });
    }
    /**
     * 发送单向消息
     */
    @RequestMapping("/testOneWay")
    public void testOneWay(){
        //参数一：topic   如果想添加tag,可以使用"topic:tag"的写法
        //参数二：消息内容
        rocketMQTemplate.sendOneWay("test-topic","单向消息测试");
    }
}

SpringBoot provides us with the RocketMQTemplate template class, which we can use to send messages in various forms.

The sending method specifies the Topic topic test-topic.

• Create a new message consumer to listen to RocketMQConsumerListener, listen to messages, and consume messages

package com.example.springbootrocketdemo.config;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.stereotype.Service;
/**
 * 消费消息
 * 配置RocketMQ监听
 * @author qzz
 */
@Service
@RocketMQMessageListener(consumerGroup = "test",topic = "test-topic")
public class RocketMQConsumerListener implements RocketMQListener<String> {
    @Override
    public void onMessage(String s) {
        System.out.println("消费消息："+s);
    }
}

The consumer class must implement the RocketMQListener interface , and dynamically specify the message type String.

The @RocketMQMessageListener annotation should be added to the class, specify the topic topic test-topic, and the consumer group test

Simple message sending and receiving is completed!

• Start the service and test message consumption

Test synchronization Message:

Test asynchronous message:

## Test one-way message:

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