【转】深入掌握JMS（二）：一个JMS例子
深入掌握JMS（二）：一个JMS例子
前一讲简单的介绍了一下JMS的基本概念, 这一讲结合一个例子让大家深入理解前一讲的基本概念.
??????????? 首先需要做的是选择一个JMS提供者, 如果在JavaEE环境中可以不用考虑这些. 我们选择ActiveMQ, 官方地址:
http://activemq.apache.org/. 网上有很多介绍ActiveMQ的文档, 所以在这里就不介绍了.
??????????? 按照上一讲的这个简图,
????????????? ConnectionFactory---->Connection--->Session--->Message
????????????? Destination + Session------------------------------------>Producer
????????????? Destination +
??????????? Session------------------------------------>MessageConsumer
??????????? 首先需要得到ConnectionFactoy和Destination，这里创建一个一对一的Queue作为Destination。
????????????? ConnectionFactory factory = new
??????????? ActiveMQConnectionFactory("vm://localhost");
????????????? Queue queue = new ActiveMQQueue("testQueue");
??????????? 然后又ConnectionFactory创建一个Connection, 再启动这个Connection:
????????????? Connection connection = factory.createConnection();
????????????? connection.start();
??????????? 接下来需要由Connection创建一个Session:
????????????? Session session = connection.createSession(false,
??????????? Session.AUTO_ACKNOWLEDGE)
??????????????? 现在暂且不用管参数的含义, 以后会详细讲到.
??????????? 下面就可以创建Message了,这里创建一个TextMessage。
????????????? Message message = session.createTextMessage("Hello JMS!");
??????????? 要想把刚才创建的消息发送出去，需要由Session和Destination创建一个消息生产者：
????????????? MessageProducer producer = session.createProducer(queue);
??????????? 下面就可以发送刚才创建的消息了：
????????????? producer.send(message);
??????????? 消息发送完成之后，我们需要创建一个消息消费者来接收这个消息：
????????????? MessageConsumer comsumer = session.createConsumer(queue);
????????????? Message recvMessage = comsumer.receive();
??????????? 消息消费者接收到这个消息之后，就可以得到它的内容：
????????????? System.out.println(((TextMessage)recvMessage).getText());
??????????? 至此，一个简单的JMS例子就完成了。下面是全部源码 ：
??????????? import javax.jms.Connection;
??????????? import javax.jms.Message;
??????????? import javax.jms.MessageConsumer;
??????????? import javax.jms.MessageProducer;
??????????? import javax.jms.Queue;
??????????? import javax.jms.Session;
??????????? import javax.jms.TextMessage;
??????????? import org.apache.activemq.ActiveMQConnectionFactory;
??????????? import org.apache.activemq.command.ActiveMQQueue;
??????????? public class MessageSendAndReceive {
??????????????? public static void main(String[] args) throws Exception {
??????????????????? ConnectionFactory factory = new
??????????? ActiveMQConnectionFactory("vm://localhost");
??????????????????? Connection connection = factory.createConnection();
??????????????????? connection.start();
??????????????????? Queue queue = new ActiveMQQueue("testQueue");
??????????????????? final Session session = connection.createSession(false,
??????????? Session.AUTO_ACKNOWLEDGE);
??????????????????? Message message = session.createTextMessage("Hello JMS!");
??????????????????? MessageProducer producer = session.createProducer(queue);
??????????????????? producer.send(message);
??????????????????? System.out.println("Send Message Completed!");
??????????????????? MessageConsumer comsumer = session.createConsumer(queue);
??????????????????? Message recvMessage = comsumer.receive();
??????????????????? System.out.println(((TextMessage)recvMessage).getText());
??????????????? }
??????????? }
