Broker ActiveMQ learning

First, the concept

           ActiveMQ is equivalent to a service instance

                    Broker is actually realized in the form of code started embedding ActiveMQ MQ to java code, so feel free to use at any time to start, when to go to start with this will save resources, but also to ensure reliability.

Second, start ActiveMQ according to different profiles

           1, first ActiveMQ conf folder under the root directory activemq.xml copy and rename activemq02.xml

                Command (cp activemq.xml activemq02.xml)

           2, start activemq02.xml, default startup is activemq.xml

                命令（./activemq start xbean:file:/usr/local/activeMQ/apache-activemq-5.15.11/conf/activemq02.xml）

Third, embedded Broker

           Java application constructed using ActiveMQ Broker as a separate messaging server. ActiveMQ also supports virtual machine communication, based on the embedded broker, able to seamlessly integrate with other applications java

Fourth, the code

            1, pom.xml packet introduced

  <!--activemq-->
    <dependency>
      <groupId>org.apache.activemq</groupId> <artifactId>activemq-all</artifactId> <version>5.15.9</version> </dependency> <!--fastjson--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.9</version> </dependency>

            2, broker Code             

import org.apache.activemq.broker.BrokerService;

/**
 * @ProjectName: springbootActiveMQ
 * @Package: cn.**.test
 * @Author: huat * @Date: 2020/1/10 16:04 * @Version: 1.0 */ public class EmbedBroker { public static void main(String[] args) throws Exception { //ActiveMQ也支持在虚拟机中通信,嵌入broker BrokerService brokerService=new BrokerService(); //将activeMQ嵌入到java程序中 brokerService.setUseJmx(true); //现在是将activeMQ嵌入到java程序中，所以使用本机 brokerService.addConnector("tcp://127.0.0.1:61616"); //启动程序 brokerService.start(); } } 

            3, the code producer queue    

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * @ProjectName: springbootActiveMQ
 * @Package: cn.**.test * @Author: huat * @Date: 2020/1/2 17:04 * @Version: 1.0 */ public class ActiveMQTest { //url路径 private static final String ACTRIVE_URL="tcp://127.0.0.1:61616"; //队列名称 private static final String QUEUE_NAME="queue01"; public static void main(String[] args) { //1、创建连接工厂 //如果账号密码没有修改的话，账号密码默认均为admin ActiveMQConnectionFactory activeMQConnectionFactory=new ActiveMQConnectionFactory(ACTRIVE_URL); try { //2、通过连接工厂获取连接 Connection connection = activeMQConnectionFactory.createConnection(); connection.start(); //3、创建session会话 //里面会有两个参数，第一个为事物，第二个是签收 Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE); //4、创建目的地（具体是队列还是主题）,这里是创建队列 Queue queue=session.createQueue(QUEUE_NAME); //5、创建消息生产者，队列模式 MessageProducer messageProducer = session.createProducer(queue); //6、通过messageProducer生产三条消息发送到MQ消息队列中 for (int i=0;i<3;i++){ //7、创建消息 TextMessage textMessage = session.createTextMessage("msg----->" + i);//创建一个文本消息 //8、通过messageProducer发送给mq messageProducer.send(textMessage); //9、数据非持久化 messageProducer.setDeliveryMode(DeliveryMode.PERSISTENT); } messageProducer.close(); session.commit(); session.close(); connection.close(); System.out.println("消息发送成功"); } catch (JMSException e) { e.printStackTrace(); } } } 

            3, consumers queue Code   

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * @ProjectName: springbootActiveMQ
 * @Package: cn.**.test * @Author: huat * @Date: 2020/1/3 8:47 * @Version: 1.0 */ public class ActiveMQConsumer { //url路径 private static final String ACTRIVE_URL="tcp://127.0.0.1:61616"; //队列名称 private static final String QUEUE_NAME="queue01"; public static void main(String[] args) { //1、创建连接工厂 //如果账号密码没有修改的话，账号密码默认均为admin ActiveMQConnectionFactory activeMQConnectionFactory=new ActiveMQConnectionFactory(ACTRIVE_URL); //如果账号密码修改的话 //第一个参数为账号，第二个为密码，第三个为请求的url //ActiveMQConnectionFactory activeMQConnectionFactory1=new ActiveMQConnectionFactory("admin","admin",ACTRIVE_URL); try { //2、通过连接工厂获取连接 Connection connection = activeMQConnectionFactory.createConnection(); connection.start(); //3、创建session会话 //里面会有两个参数，第一个为事物，第二个是签收 Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); //4、这里接受的queue的名称要和发送者的一致 Queue queue = session.createQueue(QUEUE_NAME); //5、创建消费者 MessageConsumer consumer = session.createConsumer(queue); //6、通过监听的方式消费消息 while(true){ //MessageConsumer 调用的receive方法为同步调用，在消息到达之前一直阻塞线程 //用什么格式发送，这里就用什么格式接受 //receive等待消息，不限制时间 TextMessage message=(TextMessage)consumer.receive(); //receive带参数等待消息，限制时间，单位毫秒 //TextMessage message=(TextMessage)consumer.receive(4000L); if(null != message){ System.out.println("接受的消息为------>"+message.getText()); }else{ break; } } //7、闭资源 consumer.close(); session.close(); connection.close(); }catch (Exception e){ e.printStackTrace(); } } } 

 

 Source: webmaster platform