java - 消费来自 MQ 的消息

Question

我正在尝试使用来自 MQ 的消息，但代码挂起并且不显示输出。

JmsFactoryFactory FF = jmsFactoryFactory.getInstance(WMQConstants.WMQ_PROVIDER);
JmsConnectionFactory cf = FF.createConnectionFactory();
cf.setStringProperty(WMQConstants.WMQ_HOST_NAME, HOST);
cf.setStringProperty(WMQConstants.WMQ_PORT, PORT);
cf.setStringProperty(WMQConstants.WMQ_CHANNEL, CHANNEL);
cf.setStringProperty(WMQConstants.WMQ_CONNECTION_MODE, WMQConstants.WMQ_CM_CLIENT);
cf.setStringProperty(WMQConstants.WMQ_QUEUE_MANAGER, QMGR);
cf.setStringProperty(WMQConstants.WMQ_APPLICATIONNAME, "JMS");
Connection connection = cf.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
destination = session.createQueue(queuename);
MessageConsumer consumer1 = session.createConsumer(destination);

Message reply = consumer1.receive();
System.out.println(reply);

它不显示消息并挂起，甚至不终止。

Answer 1

您需要调用start()在您的 javax.jms.Connection 实例上，以便让消息流向消费者，例如:

connection.start()

另外，值得注意的是，调用javax.jms.MessageConsumer#receive()预计会阻塞，直到收到消息，因此您会看到预期的行为。如果您不想屏蔽可以调用javax.jms.MessageConsumer#receive(long)并指定超时(以毫秒为单位)。