ActiveMQ入门：点对点模型

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消息生产者：

import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class Producer {    private static final String USERNAME= ActiveMQConnection.DEFAULT_USER; //默认连接用户名    private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;//默认连接密码    private static final String BROKER_URL=ActiveMQConnection.DEFAULT_BROKER_URL;//默认连接地址    private static final int SENDNUM=10; //发送的消息数量    public static void main(String[] args) {        ConnectionFactory connectionFactory;        Connection connection=null;        Session session; //接收或发送消息        Destination destination; //消息的目的地        MessageProducer messageProducer; //消息生产者        try {            connectionFactory=new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);            connection=connectionFactory.createConnection(); //通过连接工厂获取连接            connection.start(); //启动连接            //第一个参数表示是否开启事务,第二个表示确认事务的方式            session=connection.createSession(true,Session.AUTO_ACKNOWLEDGE); //创建Session            destination=session.createQueue("FirstQueue"); //创建消息队列            messageProducer=session.createProducer(destination);//创建消息生产者            sendMessage(session,messageProducer);  //发送消息            session.commit(); //由于开启了事务,所以要提交事务        } catch (JMSException e) {            e.printStackTrace();        } finally {            if (connection!=null){                try {                    connection.close();                } catch (JMSException e) {                    e.printStackTrace();                }            }        }    }    //发送消息    private static void sendMessage(Session session,MessageProducer messageProducer){        try {            for (int i = 0; i < SENDNUM; i++) {                TextMessage message=session.createTextMessage("ActiveMQ 发送的消息"+i);                System.out.println("发送的消息 : ActiveMQ 发送的消息"+i);                messageProducer.send(message);  //发送消息            }        } catch (JMSException e){            e.printStackTrace();        }    }}

消息消费者：

import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class Customer {    private static final String USERNAME= ActiveMQConnection.DEFAULT_USER; //默认连接用户名    private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;//默认连接密码    private static final String BROKER_URL=ActiveMQConnection.DEFAULT_BROKER_URL;//默认连接地址    public static void main(String[] args) {        ConnectionFactory connectionFactory;        Connection connection=null;        Session session; //接收或发送消息        Destination destination; //消息的目的地        MessageConsumer messageConsumer; //消息消费者        try {            connectionFactory=new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);            connection=connectionFactory.createConnection();            connection.start();            session=connection.createSession(false,Session.AUTO_ACKNOWLEDGE);            destination=session.createQueue("FirstQueue"); //创建连接的消息队列            messageConsumer=session.createConsumer(destination);            /*while (true){                TextMessage textMessage= (TextMessage) messageConsumer.receive(1000);                if (textMessage!=null){                    System.out.println("收到的消息："+textMessage.getText());                }                else {                    break;                }            }*/            messageConsumer.setMessageListener(new Listener()); //注册消息监听        } catch (JMSException e){            e.printStackTrace();        }    }}

监听器：

import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageListener;import javax.jms.TextMessage;public class Listener implements MessageListener{    //消息监听    @Override    public void onMessage(Message message) {        try {            System.out.println("收到的消息: "+((TextMessage)message).getText());        } catch (JMSException e) {            e.printStackTrace();        }    }}

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