rocketMQ实战（四）: hello world

最新推荐文章于 2024-08-12 21:00:00 发布

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本文通过示例介绍了如何使用 RocketMQ 进行消息的生产和消费。首先，在项目的 pom 文件中添加了 RocketMQ 相关依赖。然后，通过 Java 代码创建了一个同步生产者并发送了消息到指定主题及标签。接着，创建了一个默认的推送消费者来监听并消费这些消息。

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step1：pom文件中引入依赖

<dependency>
   <groupId>org.apache.rocketmq</groupId>
   <artifactId>rocketmq-client</artifactId>
   <version>4.0.0-incubating</version>
</dependency>
<dependency>
   <groupId>org.apache.rocketmq</groupId>
   <artifactId>rocketmq-all</artifactId>
   <version>4.0.0-incubating</version>
</dependency>

step2 : 创建生产者生产消息

package com.example.demo.rocketmq.simpledemo;

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

public class SyncProducer {
    public static void main(String[] args) throws Exception {
        //Instantiate with a producer group name.
        DefaultMQProducer producer = new DefaultMQProducer("testProducer");
        producer.setNamesrvAddr("ip:9876"); //多个nameserver用;隔开
        producer.setVipChannelEnabled(false);//假设你brokerIP  10911的话VIP通道端口为10911-2（阿里云部署的特别注意）
        //Launch the instance.
        producer.start();
        for (int i = 0; i < 100; i++) {
            //Create a message instance, specifying topic, tag and message body.
            Message msg = new Message("TopicTest" /* Topic */,
                    "TagA" /* Tag */,
                    ("Hello RocketMQ " +
                            i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
            );
            //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();
    }
}

创建生产者生产消息：

package com.example.demo.rocketmq.simpledemo;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;

import java.util.List;

public class Consumer {
    public static void main(String[] args) throws Exception {
        //DefaultMQPushConsumer注册监听器消费，没有控制权。
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("testPushConsumer");
        consumer.setVipChannelEnabled(false);
        consumer.setNamesrvAddr("ip:9876");
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        consumer.subscribe("TopicTest", "TagA || TagC || TagD");//*订阅全部tag

        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) {
                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        consumer.start();
        System.out.printf("Broadcast Consumer Started.%n");
    }
}

这个只是hello world级别的demo，rocketmq提供了丰富的生产消息机制和消费消息机制，后续章节会进行全面介绍。