rocketmq 的安装与简单的示例代码java

参考官方文档 https://rocketmq.apache.org/docs/quick-start/

下载rocketmq源码 https://rocketmq.apache.org/dowloading/releases/ （我的版本为4.5.0 。最新的4.8.0安装namesrv时报错）

解压源码

unzip rocketmq-all-4.5.0-source-release.zip

进入解压文件夹，使用mvn编译（需要maven版本3.0以上）

mvn -Prelease-all -DskipTests clean install -U

启动namesrv

修改bin目录下的runserver.sh虚拟机内存参数

cd distribution/target/apache-rocketmq/
vim bin/runserver.sh

将

JAVA_OPT="${JAVA_OPT} -server -Xms2g -Xmx2g -Xmn1g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"

修改为

JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn512m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"

启动命令

nohub sh bin/mqnamesrv >namesrv.log 2>&1 &

启动broker

修改bin目录下runbroker.sh的java虚拟机内存参数

JAVA_OPT="${JAVA_OPT} -server -Xms4g -Xmx4g -Xmn2g"

修改为

JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn512m"

启动broker

nohub sh bin/mqbroker -n localhost:9876 -c conf/2m-noslave/broker-a.properties >broker-a.log 2>&1 &

注意 localhost是namesrv的ip地址或域名

namesrv与broker都可以是集群部署，参考conf目录下的2m-2s-async（2主2从异步）目录下的配置文件，只需要执行sh bin/mqbroker命令时替换不同的配置文件即可

关闭 namesrv和broker

sh bin/mqshutdown broker
sh bin/mqshutdown namesrv

java示例代码

pom依赖

    <dependency>
      <groupId>org.apache.rocketmq</groupId>
      <artifactId>rocketmq-spring-boot-starter</artifactId>
      <version>2.0.4</version>
    </dependency>

application.properties

#=======================================================ROCKET MQ====================================================#

rocketmq.name-server=192.168.92.128:9876
#消息发送组
rocketmq.producer.group=rocket-group

ProducerService.java

package com.wl.mq.rocket;

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.messaging.Message;
import org.springframework.stereotype.Service;

/**
 * Created by Administrator on 2021/3/6.
 */
@Service
public class ProducerService {

    private RocketMQTemplate rocketMQTemplate;

    @Autowired
    public ProducerService(RocketMQTemplate rocketMQTemplate){
        this.rocketMQTemplate = rocketMQTemplate;
    }

    /**
     * 同步发送消息
     * destination formats: `topicName:tags`
     *  最终调用 RocketMQTemplate 中的 doSend 方法
     */
    public void convertAndSend(String destination,String message){
        rocketMQTemplate.convertAndSend(destination,message);
    }

    /**
     * MessageBuilder.withPayload("Hello, World! I'm from spring message").build()
     * 最终调用 RocketMQTemplate 中的 doSend 方法
     */
    public void send(String destination, Message message){
        rocketMQTemplate.send(destination, message);
    }

    public void syncSend(String destination,String message){
        rocketMQTemplate.syncSend(destination,message);
    }

    public SendResult syncSendOrderly(String destination, String message, String hashKey){
        return rocketMQTemplate.syncSendOrderly(destination,message,hashKey);
    }

    //========================================================================
    //send messgae asynchronously

    public void asyncSend(String destination,String message){
        rocketMQTemplate.asyncSend(destination,message,null);
    }

    public void asyncSend(String destination, String message, SendCallback callback){
        rocketMQTemplate.asyncSend(destination,message,callback);
    }

    public void asyncSendOrderly(String destination,String message,String hashKey){
        rocketMQTemplate.asyncSendOrderly(destination,message,hashKey,null);
    }

    public void asyncSendOrderly(String destination,String message,String hashKey,SendCallback callback){
        rocketMQTemplate.asyncSendOrderly(destination,message,hashKey,callback);
    }


}

ConsumerServiceA.java

package com.wl.mq.rocket;

import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.stereotype.Service;

/**
 * Created by Administrator on 2021/3/6.
 * RocketMQMessageListener 监听相同的topic 如果consumerGroup不一样则会所有的consumerGroup都会被消费(将ConsumerServiceB注释打开执行RocketMqTest 会发现消息被消费两次)
 * 在集群环境下consumerGroup一样（例如将这个服务分别部署到两台服务器上）则 ConsumerServiceA只会消费一次OnMessage(相当于activeMq中的虚拟topic)
注意 一个应用里面consumerGroup必须全局唯一，否则应用将启动失败。
 *
 */
@Service
@RocketMQMessageListener(topic = "rocket-order-topic", consumerGroup = "rocket-consumer-order-topic-a")
public class ConsumerServiceA implements RocketMQListener<String> {
    @Override
    public void onMessage(String message) {
        System.out.println("================================================ rocket-consumer-order-topic-a");
        System.out.println("=============rocket-order-topic=================");
        System.out.println(message);
        System.out.println("=============rocket-order-topic=================");
    }
}

测试代码

package com.wl.mq;

import com.wl.mq.rocket.ProducerService;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * Created by Administrator on 2021/3/6.
 */
@SpringBootTest(classes = Application.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class RocketMqTest {

    @Autowired
    private ProducerService producerService;

    @Test
    public void testConvertAndSend() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testConvertAndSend";
        producerService.convertAndSend(destination,message);
        Thread.sleep(100000);
    }

    @Test
    public void testSend() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testSend";
        producerService.convertAndSend(destination,message);
        Thread.sleep(100000);
    }

    @Test
    public void testSyncSend() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testSyncSend";
        producerService.syncSend(destination,message);
        Thread.sleep(100000);
    }

    @Test
    public void testSyncSendOrderly() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testSyncSendOrderly";
        String hashKey = "hashKey";
        SendResult sendResult = producerService.syncSendOrderly(destination,message,hashKey);
        System.out.println(sendResult.getSendStatus());
        Thread.sleep(100000);
    }

    @Test
    public void testAsyncSend() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testAsyncSend";
        producerService.asyncSend(destination,message);
        Thread.sleep(100000);
    }


    @Test
    public void testAsyncSendCallBack() throws Exception{
        String destination = "rocket-order-topic";
        String message = "hello this is rocketMq topic message testAsyncSendCallBack";
        producerService.asyncSend(destination, message, new SendCallback() {
            @Override
            public void onSuccess(SendResult sendResult) {
                System.out.println("===========success==============");
            }

            @Override
            public void onException(Throwable throwable) {
                System.out.println("============exception===========");
            }
        });
        Thread.sleep(100000);
    }




}

在rocketmq中，集群环境下如果监听的topic相同且consumerGroup相同，那么该消息只会被执行一次，完美解决了activemq中集群环境下topic会被重复消费的问题（activemq可以通过虚拟topic解决该问题）

rocketmq 控制台

进入github https://github.com/apache/rocketmq-externals

打开rocketmq-console项目，这是一个spring-boot项目修改其application.properties中的rocketmq.config.namesrvAddr=192.168.92.128:9876参数

启动application打开locahost:8080如下

rocketmq 的安装与简单的示例代码java

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