JMS五种消息的发送/接收的例子

1、消息发送

 

//连接工厂
ConnectionFactory connFactory = new ActiveMQConnectionFactory(
        ActiveMQConnection.DEFAULT_USER,
        ActiveMQConnection.DEFAULT_PASSWORD,
        "tcp://localhost:61616");

//连接到JMS提供者
Connection conn = connFactory.createConnection();
conn.start();

//事务性会话，自动确认消息
Session session = conn.createSession(true, Session.AUTO_ACKNOWLEDGE);

//消息的目的地
Destination destination = session.createQueue("queue.hello");

//消息生产者
MessageProducer producer = session.createProducer(destination);
producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT); //不持久化


//文本消息
TextMessage textMessage = session.createTextMessage("文本消息");
producer.send(textMessage);

//键值对消息
MapMessage mapMessage = session.createMapMessage();
mapMessage.setLong("age", new Long(32));
mapMessage.setDouble("sarray", new Double(5867.15));
mapMessage.setString("username", "键值对消息");
producer.send(mapMessage);

//流消息
StreamMessage streamMessage = session.createStreamMessage();
streamMessage.writeString("streamMessage流消息");
streamMessage.writeLong(55);
producer.send(streamMessage);

//字节消息
String s = "BytesMessage字节消息";
BytesMessage bytesMessage = session.createBytesMessage();
bytesMessage.writeBytes(s.getBytes());
producer.send(bytesMessage);

//对象消息
User user = new User("cjm", "对象消息"); //User对象必须实现Serializable接口
ObjectMessage objectMessage = session.createObjectMessage();
objectMessage.setObject(user);
producer.send(objectMessage);


session.commit(); //在事务性会话中，只有commit之后，消息才会真正到达目的地
producer.close();
session.close();
conn.close();

 

 2、消息接收：通过消息监听器的方式接收消息

 

public class Receiver implements MessageListener{
    private boolean stop = false;

    public void execute() throws Exception {
        //连接工厂
        ConnectionFactory connFactory = new ActiveMQConnectionFactory(
                ActiveMQConnection.DEFAULT_USER,
                ActiveMQConnection.DEFAULT_PASSWORD,
                "tcp://localhost:61616");

        //连接到JMS提供者
        Connection conn = connFactory.createConnection();
        conn.start();

        //事务性会话，自动确认消息
        Session session = conn.createSession(true, Session.AUTO_ACKNOWLEDGE);

        //消息的来源地
        Destination destination = session.createQueue("queue.hello");

        //消息消费者
        MessageConsumer consumer = session.createConsumer(destination);
        consumer.setMessageListener(this);

        //等待接收消息
        while(!stop){
            Thread.sleep(5000);
        }

        session.commit();

        consumer.close();
        session.close();
        conn.close();
    }

    public void onMessage(Message m) {
        try{
            if(m instanceof TextMessage){ //接收文本消息
                TextMessage message = (TextMessage)m;
                System.out.println(message.getText());
            }else if(m instanceof MapMessage){ //接收键值对消息
                MapMessage message = (MapMessage)m;
                System.out.println(message.getLong("age"));
                System.out.println(message.getDouble("sarray"));
                System.out.println(message.getString("username"));
            }else if(m instanceof StreamMessage){ //接收流消息
                StreamMessage message = (StreamMessage)m;
                System.out.println(message.readString());
                System.out.println(message.readLong());
            }else if(m instanceof BytesMessage){ //接收字节消息
                byte[] b = new byte[1024];
                int len = -1;
                BytesMessage message = (BytesMessage)m;
                while((len=message.readBytes(b))!=-1){
                    System.out.println(new String(b, 0, len));
                }
            }else if(m instanceof ObjectMessage){ //接收对象消息
                ObjectMessage message = (ObjectMessage)m;
                User user = (User)message.getObject();
                System.out.println(user.getUsername() + " _ " + user.getPassword());
            }else{
                System.out.println(m);
            }

            stop = true;
        }catch(JMSException e){
            stop = true;
            e.printStackTrace();
        }
    }
}