RocketMQ 入门

本文讲解前不久进入apache顶级项目的RocketMQ，几个简单的例子讲解如何搭建RocketMQ，以及发送消息，接受消息。

RocketMQ安装

RocketMQ的安装需要自行编译，接下来编译源码(本文下载源码放在windows系统D:\softwares\目录下)

1. 下载源码

   git clone -b develop https://github.com/apache/rocketmq.git

2. 编译

   cd rocketmqmvn -Prelease-all -DskipTests clean install -U

3. 启动rocketmq

   cd distribution\target\apache-rocketmqset ROCKETMQ_HOME=D:\softwares\rocketmq\distribution\target\apache-rocketmqbin\mqnamesrv.cmd# 再开启一个cmd窗口，进入到D:\softwares\rocketmq\distribution\target\apache-rocketmqd:cd D:\softwares\rocketmq\distribution\target\apache-rocketmqset ROCKETMQ_HOME=D:\softwares\rocketmq\distribution\target\apache-rocketmqbin\mqbroker.cmd -n localhost:9876

   mqnamesrv启动成功

   

   mqbroker启动后无输出

   PS:不要关闭两个窗口

   下面开始代码，写发送消息，接受消息。

   引入maven依赖

   <dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId><version>4.1.0-incubating</version></dependency>

   发送消息

   package org.xxz.test.mq;import org.apache.rocketmq.client.exception.MQBrokerException;import org.apache.rocketmq.client.exception.MQClientException;import org.apache.rocketmq.client.producer.DefaultMQProducer;import org.apache.rocketmq.client.producer.SendResult;import org.apache.rocketmq.client.producer.SendStatus;import org.apache.rocketmq.common.message.Message;import org.apache.rocketmq.remoting.exception.RemotingException;public class ProducerTest {   public static void main(String[] args) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {       DefaultMQProducer producer = new DefaultMQProducer("producerGroup");       producer.setNamesrvAddr("127.0.0.1:9876");       producer.start();       Message msg = new Message();       msg.setTopic("test");       msg.setBody("hello rocketmq".getBytes());       SendResult sendResult = producer.send(msg);       if (sendResult.getSendStatus() == SendStatus.SEND_OK) {           System.out.println("send msg ok...");       }       producer.shutdown();   }}

   ​

   

   接受消息

   package org.xxz.test.mq;import java.nio.charset.StandardCharsets;import java.util.List;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.client.exception.MQClientException;import org.apache.rocketmq.common.message.MessageExt;public class ConsumerTest {   public static void main(String[] args) throws MQClientException {       DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumerGroup");       consumer.setNamesrvAddr("127.0.0.1:9876");       consumer.subscribe("test", "*");       consumer.registerMessageListener(new MessageListenerConcurrently() {           @Override           public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {               try {                   for (MessageExt msg : msgs) {                       System.out.println(new String(msg.getBody(), StandardCharsets.UTF_8));                   }               } catch (Exception e) {                   return ConsumeConcurrentlyStatus.RECONSUME_LATER;               }               return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;           }       });       consumer.start();   }}

   

   ​

   就是这么简单，后续更精彩哦。。。