RocketMQ教程(一) - 基础

目录

正文

1. 下载

选择Binary包

这里解压缩后放到了D盘, 且为了操作方便, 把文件夹从rocketmq-all-4.5.0-bin-release改名为RocketMQ

默认设置占用内存很大, 如果不是土豪配置需要修改一下

NameServer设置: D:RocketMQin unserver.cmd

修改为512m 512m 256m即可

Broker设置: D:RocketMQin unbroker.cmd

2. 设置环境变量

桌面的计算机上点击右键 -> 属性

3. 启动NameServer

在D:RocketMQin目录下启动命令行, 执行 runserver.cmd

4. 启动Broker

执行mqbroker.cmd -n localhost:9876

注意图中, Broker注册的地址是192.168.12.22：10911, 接下来需要用到

5. 创建Topic

执行mqadmin.cmd updateTopic -n localhost:9876 -b 192.168.12.22:10911 -t demo

其中用-b指定Broker, 即步骤4中显示的地址

6. 开发生产者Producer

建立一个SpringBoot项目, 添加依赖

<!-- https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-client -->
<dependency>
   <groupId>org.apache.rocketmq</groupId>
   <artifactId>rocketmq-client</artifactId>
   <version>4.4.0</version>
</dependency>

创建ProducerService

import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.common.message.Message;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

@Service
public class ProducerService {

    private DefaultMQProducer producer = null;

    @PostConstruct
    public void initMQProducer() {
        producer = new DefaultMQProducer("defaultGroup");
        producer.setNamesrvAddr("localhost:9876");
        producer.setRetryTimesWhenSendFailed(3);

        try {
            producer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

    public boolean send(String topic, String tags, String content) {
        Message msg = new Message(topic, tags, "", content.getBytes());
        try {
            producer.send(msg);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    @PreDestroy
    public void shutDownProducer() {
        if(producer != null) {
            producer.shutdown();
        }
    }
}

测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class RocketmqDemoApplicationTests {

    @Autowired
    private ProducerService producerService;

    @Test
    public void contextLoads() {
        boolean result = producerService.send("demo", "TAG-A", "Hello RocketMQ");
        assertTrue(result);
    }

}

7. 开发消费者

创建ConsumerService

@Service
public class ConsumerService {

    private DefaultMQPushConsumer consumer = null;

    @PostConstruct
    public void initMQConsumer() {
        consumer = new DefaultMQPushConsumer("defaultGroup");
        consumer.setNamesrvAddr("localhost:9876");
        try {
            consumer.subscribe("demo", "*");
            consumer.registerMessageListener(new MessageListenerConcurrently() {

                @Override
                public ConsumeConcurrentlyStatus consumeMessage(
                        List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                    for (MessageExt msg : msgs) {
                        System.out.println("Message Received: " + new String(msg.getBody()));

                    }
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                }
            });
            consumer.start();
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

    @PreDestroy
    public void shutDownConsumer() {
        if (consumer != null) {
            consumer.shutdown();
        }
    }

启动项目