activeMQ之点对点（PTP）,监听器模式

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监听器模式

Consumer

import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class Consumer implements MessageListener {  private String user = ActiveMQConnection.DEFAULT_USER;     //默认 用户  private String password = ActiveMQConnection.DEFAULT_PASSWORD;    //默认 密码  private String url = ActiveMQConnection.DEFAULT_BROKER_URL; //默认的是localhost:8080  private String subject = "DEMO.LISTENER"; //消息目的地名称  private Destination destination = null;  //在点对点（PTP）消息传递域中，目的地被成为队列（queue）  private Topic topic = null;//在发布/订阅（PUB/SUB）消息传递域中，目的地被成为主题（topic）。  private Connection connection = null;  //初始化 一个JMS客户端到JMS Provider的连接  private Session session = null;     //初始化  一个接受消息的进程  private MessageConsumer consumer = null;   //初始化 消息消费者  // 初始化  private void initialize() throws JMSException, Exception {    ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(      user, password, url);    connection = connectionFactory.createConnection();    //false 参数表示 为非事务型消息，后面的参数表示消息的确认类型（见4.消息发出去后的确认模式）    session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);    //PTP消息方式   目的地被成为队列（queue）    destination = session.createQueue(subject);    consumer = session.createConsumer(destination);  }  // 消费消息  public void start() throws Exception {    initialize();    connection.start();    System.out.println("Consumer:->Begin listening...");    consumer.setMessageListener(this);  }  // 关闭连接  public void close() throws JMSException {    System.out.println("Consumer:->Closing connection");    if (consumer != null)      consumer.close();    if (session != null)      session.close();    if (connection != null)      connection.close();  }  // 消息处理函数  public void onMessage(Message message) {    try {      if (message instanceof TextMessage) {        TextMessage txtMsg = (TextMessage) message;        String msg = txtMsg.getText();        System.out.println("Consumer:->Received: " + msg);      } else {        System.out.println("Consumer:->Received: " + message);      }    } catch (JMSException e) {      e.printStackTrace();    }  }}

Producer

import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class Producer {    private String user = ActiveMQConnection.DEFAULT_USER; //默认 用户    private String password = ActiveMQConnection.DEFAULT_PASSWORD;  //默认 密码    private String url = ActiveMQConnection.DEFAULT_BROKER_URL; //默认的是localhost:8080    private String subject = "DEMO.LISTENER"; //消息目的地名称    private Destination destination = null;  //在点对点（PTP）消息传递域中，目的地被成为队列（queue）    private Connection connection = null;  //初始化 一个JMS客户端到JMS Provider的连接    private Session session = null;  //初始化  一个发送消息的进程    private MessageProducer producer = null;    //初始化 消息生产者 (它是由session 创建的)    // 初始化    private void initialize() throws JMSException, Exception {        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(                user, password, url);        connection = connectionFactory.createConnection();        //false 参数表示 为非事务型消息，后面的参数表示消息的确认类型（见4.消息发出去后的确认模式）        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);        //PTP消息方式   目的地被成为队列（queue）        destination = session.createQueue(subject);        producer = session.createProducer(destination);        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);    }    // 发送消息    public void produceMessage(String message) throws JMSException, Exception {        initialize();        TextMessage msg = session.createTextMessage(message);        connection.start();        System.out.println("Producer:->Sending message: " + message);        producer.send(msg);        System.out.println("Producer:->Message sent complete!");    }    // 关闭连接    public void close() throws JMSException {        System.out.println("Producer:->Closing connection");        if (producer != null)            producer.close();        if (session != null)            session.close();        if (connection != null)            connection.close();    }}

Test

public class Test {    public static void main(String[] args) throws  Exception {        Consumer consumer = new Consumer();        Producer producer = new Producer();        //通过监听Listener 开始监听        consumer.start();        // 延时500毫秒之后发送消息        Thread.sleep(500);        producer.produceMessage("Hello, world!");        producer.close();        consumer.close();    }}

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