ActiveMQ中队列模式和主题模式

ActiveMQ是什么：ActiveMQ是基于JMS规范实现的一种消息中间件。
JMS(JAVA MESSAGE SERVICE)是一种规范，API。
JMS接口间的关系如下：
工厂创建连接，连接创建会话，会话创建消息、生产者和消费者，生产者向目标对象发送信息，消费者从目标对象订阅信息。

下面是ActiveMQ中Queue模式和Topic模式的对比。

Queue模式

生产者

public class AppQueueConsumer {
    private static final String url = "tcp://127.0.0.1:61617";
    private static final String queueName = "testQueue";

    public static void main(String[] args) throws JMSException {
        //创建工厂
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
        //创建连接
        Connection connection = connectionFactory.createConnection();
        // 启动连接
        connection.start();
        // 创建会话 false指是否在事务上处理，Session.AUTO_ACKNOWLEDGE为应答模式，这里是自动应答
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //创建一个目标
        Queue queue = session.createQueue(queueName);
        //创建消费者
        MessageConsumer consumer = session.createConsumer(queue);
        //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();
                }
            }
        });
    }
}

消费者

public class AppQueueProducer {
    private  static  final String url="tcp://127.0.0.1:61617";
    private  static  final String queueName="testQueue";

    public static void main(String[] args) throws JMSException {
        //创建工厂
        ConnectionFactory connectionFactory=new ActiveMQConnectionFactory(url);
        //创建连接
        Connection connection = connectionFactory.createConnection();
        // 启动连接
        connection.start();
        // 创建会话 false指是否在事务上处理，Session.AUTO_ACKNOWLEDGE为应答模式，这里是自动应答
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //创建一个目标
        Queue queue = session.createQueue(queueName);
        //创建生产者
        MessageProducer producer = session.createProducer(queue);

        for (int i = 0; i < 100; i++) {
        //创建消息
            TextMessage textMessage = session.createTextMessage("test:" + i);
            //发送消息
            producer.send(textMessage);
            System.out.println(" 发送消息："+textMessage.getText());![在这里插入图片描述](https://img-blog.csdnimg.cn/20190519192111611.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc3MDU0NQ==,size_16,color_FFFFFF,t_70)
        }
        //关闭连接
        connection.close();
    }
}

运行效果：消费者我开了两个进程测试，如下：可以看到两个进程分摊了发送的信息

Topic模式

生产者

public class AppTopicProducer {
 private static final String url = "tcp://127.0.0.1:61617";
 private static final String topicName = "testTopic";

 public static void main(String[] args) throws JMSException {
     //创建工厂
     ConnectionFactory connectionFactory=new ActiveMQConnectionFactory(url);
     //创建连接
     Connection connection = connectionFactory.createConnection();
     // 启动连接
     connection.start();
     // 创建会话 false指是否在事务上处理，Session.AUTO_ACKNOWLEDGE为应答模式，这里是自动应答
     Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
     //创建一个目标
     Topic topic = session.createTopic(topicName);
     //创建生产者
     MessageProducer producer = session.createProducer(topic);

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

消费者

public class AppTopicConsumer {
   private static final String url = "tcp://127.0.0.1:61617";
   private static final String topicName = "testTopic";

   public static void main(String[] args) throws JMSException {
       //创建工厂
       ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
       //创建连接
       Connection connection = connectionFactory.createConnection();
       // 启动连接
       connection.start();
       // 创建会话 false指是否在事务上处理，Session.AUTO_ACKNOWLEDGE为应答模式，这里是自动应答
       Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
       //创建一个目标
       Topic topic = session.createTopic(topicName);
       //创建消费者
       MessageConsumer consumer = session.createConsumer(topic);
       //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();
               }
           }
       });
   }
}