ActiveMQ_消费者编码

public class JmsConsumer {

    public static final String ACTIVEMQ_URL = "tcp://192.168.xx.xx:61616";

    public static void main(String[] args) throws Exception{
        //创建activemq连接工厂
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(ACTIVEMQ_URL);
        //获得连接
        Connection connection = factory.createConnection();
        //打开连接
        connection.start();
        //创建session
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        //创建目的地对象
        Destination queue = session.createQueue("queue01");

        //创建消费者
        MessageConsumer consumer = session.createConsumer(queue);

        //消费消息
        while (true){

            //接收消息
            TextMessage message = (TextMessage) consumer.receive();
            //判断消息是否为空
            if(null != message){
                System.out.println(message.getText());
            }else{
                break;
            }

        }
        //关闭资源
        consumer.close();
        session.close();
        connection.close();
    }

}

　　强调：consumer的receive有两个，无参receive()：表示一直等着，程序挂着那；有参receive（timeout）：在规定时间内等待;所以我们的receive它是同步阻塞的

　　上面是通过receive来消费消息，现在采用监听器的方式（异步非阻塞）：

public class JmsConsumer2 {

    public static final String ACTIVEMQ_URL = "tcp://192.168.xx.xxx:61616";

    public static void main(String[] args) throws Exception{
        //创建activemq连接工厂
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(ACTIVEMQ_URL);
        //获得连接
        Connection connection = factory.createConnection();
        //打开连接
        connection.start();
        //创建session
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        //创建目的地对象
        Destination queue = session.createQueue("queue01");

        //创建消费者
        MessageConsumer consumer = session.createConsumer(queue);

        //监听消息
        consumer.setMessageListener(new MessageListener() {
            @Override
            public void onMessage(Message message) {
                if(null != message && message instanceof TextMessage){
                    TextMessage textMessage = (TextMessage) message;
                    try {
                        System.out.println(textMessage.getText());
                    } catch (JMSException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
        System.in.read();
        //关闭资源
        consumer.close();
        session.close();
        connection.close();
    }

}