Java ActiveMQ: A Practical Guide to Message Queuing

1. Install and configure ActiveMQ

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activemq start

After executing this command, ActiveMQ will start and start running.

2. Send messages using Java application

Now, we can use Java application to send messages. First, you need to create a Java project, and then import the following dependencies into the project:

<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-client</artifactId>
<version>5.16.0</version>
</dependency>

After importing dependencies, you can use Java code to send messages. The following is a sample code:

import javax.jms.*;

public class SendMessage {

public static void main(String[] args) {
// 设置ActiveMQ的URL
String url = "tcp://localhost:61616";

// 创建一个连接工厂
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);

// 创建一个连接
Connection connection = connectionFactory.createConnection();

// 启动连接
connection.start();

// 创建一个会话
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

// 创建一个消息目的地
Destination destination = session.createQueue("myQueue");

// 创建一个消息生产者
MessageProducer producer = session.createProducer(destination);

// 创建一个文本消息
TextMessage message = session.createTextMessage("Hello, ActiveMQ!");

// 发送消息
producer.send(message);

// 关闭连接
connection.close();
}
}

3. Receive messages using Java application

Now, we can use Java application to receive messages. First, you need to create a Java project, and then import the following dependencies into the project:

<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-client</artifactId>
<version>5.16.0</version>
</dependency>

After importing dependencies, you can use Java code to receive messages. The following is a sample code:

import javax.jms.*;

public class ReceiveMessage {

public static void main(String[] args) {
// 设置ActiveMQ的URL
String url = "tcp://localhost:61616";

// 创建一个连接工厂
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);

// 创建一个连接
Connection connection = connectionFactory.createConnection();

// 启动连接
connection.start();

// 创建一个会话
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

// 创建一个消息目的地
Destination destination = session.createQueue("myQueue");

// 创建一个消息消费者
MessageConsumer consumer = session.createConsumer(destination);

// 接收消息
Message message = consumer.receive();

// 打印消息内容
System.out.println("Received message: " + message.getBody(String.class));

// 关闭连接
connection.close();
}
}

4. Summary

In this article, we introduce how to use ActiveMQ to build a simple Message queue system. We first covered how to install and configure ActiveMQ, then how to use a Java application to send and receive messages. Hope this article is helpful to you.

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