activeMQ(1)

消息中间件

作用：解耦 削峰  异步

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JMS编码总体架构：

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一般代码流程

 @Test
    public void test1(){
        //创建连接工厂
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(MQ_URL);
        try {
            Connection connection = factory.createConnection();
            connection.start();

            //创建会话session
            Session session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);

            //创建目的地(具体是队列还是主题)
            Queue queue = session.createQueue("myFirstQueue");

            //创建消息的生产者
            MessageProducer producer = session.createProducer(queue);
            for (int i = 0; i < 3; i++) {
                //创建消息
                TextMessage message = session.createTextMessage("hello--->"+i);
                //通过消息生产者发送消息至mq
                producer.send(message);
            }
            producer.close();
            session.close();
            connection.close();

        }catch (Exception e){
            e.printStackTrace();
        }

        System.out.println("********************");

    }

 @Test
    public void test2(){
        //创建连接工厂
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(MQ_URL);
        try {
            Connection connection = factory.createConnection();
            connection.start();

            //创建会话session
            Session session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);

            //创建目的地(具体是队列还是主题)
            Queue queue = session.createQueue("myFirstQueue");

            //创建消息的消费者
            MessageConsumer consumer = session.createConsumer(queue);
            for (int i = 0; i < 3; i++) {
                TextMessage message = (TextMessage)consumer.receive();   //阻塞式接收
                if(message!=null){
                    System.out.println("receive---->"+message.getText());
                }
            }
    //监听器式接收
　　　　　　　consumer.setMessageListener((Message message) -> {

    if (message != null && message instanceof TextMessage) {
        try {
            System.out.println(((TextMessage) message).getText());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
});

consumer.close(); session.close(); connection.close(); }catch (Exception e){ e.printStackTrace(); } System.out.println("********************"); }

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consumer.setMessageListener((Message message) -> {
    if (message != null && message instanceof TextMessage) {
        try {
            System.out.println(((TextMessage) message).getText());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
});