Getting Started with ActiveMQ

1. Download ActiveMQ, go to the activemq official website to download the corresponding installation package for Windows or Linux

2. Install ActiveMQ 

Under Windows system, unzip  apache-activemq-5.15.3-bin.zip , and then there are win32 and win64 folders in the bin directory (select according to your computer system), activemq.bat in the win64 directory (right click, run as administrator) ) can be run from the command line. In addition, double-clicking InstallService.bat can also run it as a service after installation.

The Linux installation runs.

Download apache-activemq-5.15.3-bin.tar.gz , then unzip it, then run bin/activemq start

Test whether the installation is successful: visit http://localhost:8161 , if you can access it, the installation is successful.

3. Create a simple spring-boot project to introduce ActiveMQ

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-activemq</artifactId>
</dependency>

4. Write experimental code

Queue mode (consumers consume messages under the producer queue on average)

package com.codingos.springboot.activemq.queue;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
/**
 * 队列模式 生产者
 */
public class AppProducer {

	private static final String url = "tcp://localhost:61616";
	private static final String queueName = "queue-test";

	public static void main(String[] args) throws JMSException {
		// 1.常见ConnectionFactory
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
		// 2.创建Connection
		Connection connection = connectionFactory.createConnection();
		// 3.启动连接
		connection.start();
		// 4.创建会话 (1参: 是否在事务中处理, 2参: 使用自动应答模式)
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		// 5.创建一个目标队列
		Destination destination = session.createQueue(queueName);
		// 6.创建生产者
		MessageProducer producer = session.createProducer(destination);

		for (int i = 0; i < 100; i++) {
			// 7.创建消息
			TextMessage textMessage = session.createTextMessage("Message " + i);
			// 8.发送消息
			producer.send(textMessage);
			System.out.println("发送消息: " + textMessage.getText());
		}
		// 9.关闭连接
		connection.close();
	}
}

package com.codingos.springboot.activemq.queue;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
/**
 * 队列模式 消费者
 */
public class AppConsumer {
	
	private static final String url = "tcp://localhost:61616";
	private static final String queueName = "queue-test";

	public static void main(String[] args) throws JMSException {
		// 1.常见ConnectionFactory
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
		// 2.创建Connection
		Connection connection = connectionFactory.createConnection();
		// 3.启动连接
		connection.start();
		// 4.创建会话 (1参: 是否在事务中处理, 2参: 使用自动应答模式)
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		// 5.创建一个目标队列
		Destination destination = session.createQueue(queueName);
		// 6.创建消费者
		MessageConsumer consumer = session.createConsumer(destination);
		// 7.创建监听器
		consumer.setMessageListener(new MessageListener() {
			@Override
			public void onMessage(Message message) {
				TextMessage textMessage = (TextMessage) message;
				try {
					System.out.println("接收消息: "+textMessage.getText());
				} catch (JMSException e) {
					e.printStackTrace();
				}
			}
		});
	}
}

Topic mode (subscribers fully consume messages under the publisher's topic)

package com.codingos.springboot.activemq.topic;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
/**
 * 主题模式 发布者
 */
public class AppProducer {

	private static final String url = "tcp://localhost:61616";
	private static final String topicName = "topic-test";

	public static void main(String[] args) throws JMSException {
		// 1.常见ConnectionFactory
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
		// 2.创建Connection
		Connection connection = connectionFactory.createConnection();
		// 3.启动连接
		connection.start();
		// 4.创建会话 (1参: 是否在事务中处理, 2参: 使用自动应答模式)
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		// 5.创建一个目标主题
		Destination destination = session.createTopic(topicName);
		// 6.创建发布者
		MessageProducer producer = session.createProducer(destination);

		for (int i = 0; i < 100; i++) {
			// 7.创建消息
			TextMessage textMessage = session.createTextMessage("Message " + i);
			// 8.发送消息
			producer.send(textMessage);
			System.out.println("发送消息: " + textMessage.getText());
		}
		// 9.关闭连接
		connection.close();
	}
}

package com.codingos.springboot.activemq.topic;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
/**
 * 主题模式 订阅者
 */
public class AppConsumer {
	
	private static final String url = "tcp://localhost:61616";
	private static final String topicName = "topic-test";

	public static void main(String[] args) throws JMSException {
		// 1.常见ConnectionFactory
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
		// 2.创建Connection
		Connection connection = connectionFactory.createConnection();
		// 3.启动连接
		connection.start();
		// 4.创建会话 (1参: 是否在事务中处理, 2参: 使用自动应答模式)
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		// 5.创建一个目标主题
		Destination destination = session.createTopic(topicName);
		// 6.创建订阅者
		MessageConsumer consumer = session.createConsumer(destination);
		// 7.创建监听器
		consumer.setMessageListener(new MessageListener() {
			@Override
			public void onMessage(Message message) {
				TextMessage textMessage = (TextMessage) message;
				try {
					System.out.println("接收消息: "+textMessage.getText());
				} catch (JMSException e) {
					e.printStackTrace();
				}
			}
		});
	}
}