Rocketmq的单机搭建和消息分发时遇到的坑

1.首先准备 Jdk、rocketmq-dashboard-master、apache-maven-3.9.7-bin.tar.gz、rocketmq-all-5.1.0-bin-release.zip 这几样，dashboard是rocketmq的可视化工具，需要maven编译所以需要。

 2.创建一个app目录将所有文件解压，

maven要修改config文件更换数据源，创建一个repository仓库

<settings xmlns="http://maven.apache.org/SETTINGS/1.2.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 https://maven.apache.org/xsd/settings-1.2.0.xsd">
  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ${user.home}/.m2/repository
   -->
  <localRepository>/app/repository</localRepository> 
  <pluginGroups>
  </pluginGroups>
  <proxies>
  </proxies>
  <servers>  
  </servers>
  <mirrors>
  <mirror> 
  　　<id>nexus-aliyun</id> 
  　　<mirrorOf>*</mirrorOf>
 　　 <name>Nexus aliyun</name> 
 　　 <url>https://maven.aliyun.com/repository/public</url> 
  </mirror>
</mirrors>
<profiles>
</profiles>
</settings>

修改/etc/profile文件内容,放到文件最下面，修改完后用source /etc/profile更新环境

export JAVA_HOME=/app/jdk/
PATH=$MAVEN_HOME/bin:$ROCKETMQ_HOME/bin:$JAVA_HOME/bin:$PATH:$HOME/.local/bin:$HOME/bin
export ROCKETMQ_HOME=/app/rocketmq-all-5.1.0-bin-release
export NAMESRV_ADDR=公网IP:9876
export MAVEN_HOME=/app/apache-maven-3.9.7

修改/app/rocketmq-all-5.1.0-bin-release/conf中的配置

#允许自动创建topic
autoCreateTopicEnable=true
#添加nameserver地址
namesrvAddr=公网ip:9876
brokerIP1=公网ip

修改runborker。sh文件

 修改runserver.sh文件

在rocketmq-dashboard-master中使用mvn命令编辑mvn clean package maven.test.skip=true，打包失败的话可以换mvn clean install -U  -Dmaven.test.skip=true清除后重新编译

编译成功后，先在cd /app/rocketmq-all-5.1.0-bin-release/bin/中去

运行 nameserver----》nohup ./mqnamesrv &，

运行borker---》 nohup ./mqbroker -c ../conf/broker.conf &

回到cd /app/rocketmq-dashboard-master/target/中去

启动rocketmq-dashboard---》nohup java -jar rocketmq-dashboard-1.0.1-SNAPSHOT.jar &

启动完成后用jps命令查看启动情况，

在阿里云服务器上需要放开namersrv-9876，borker-10911，dashboard-8080端口

注意如果按了宝塔需要到安全中开放相应端口，否则请求不通。

 然后创建一个maven项目引入jar包

 <dependency>
        <groupId>org.apache.rocketmq</groupId>
        <artifactId>rocketmq-client</artifactId>
        <version>5.1.0</version>
</dependency>

　创建producer

public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {

        DefaultMQProducer producer = new DefaultMQProducer("SyncProducer");
　　　　
        producer.setNamesrvAddr("公网ip:9876");
        producer.start();

        for (int i = 0; i < 10; i++) {
            try {
                {
                    Message msg = new Message("SyncProducer",
                        "TagA"+i,
                        "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
                    SendResult sendResult = producer.send(msg,8000);
                    System.out.printf("%s%n", sendResult);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
　　　　　　
        //producer.shutdown();
    }
}

　创建消费者

public class PushConsumer {

    public static void main(String[] args) throws InterruptedException, MQClientException {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("SyncProducer");
        consumer.subscribe("SyncProducer", "*");
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
        //wrong time format 2017_0422_221800
        //consumer.setConsumeTimestamp("20181109221800");
        consumer.setNamesrvAddr("公网ip:9876");
        consumer.registerMessageListener(new MessageListenerConcurrently() {

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