ActiveMQ（二）———使用Quene来发送消息

本文链接：https://blog.youkuaiyun.com/u013755987/article/details/53750303

摘要：点对点的发送消息，使用消息队列Queue。每个消息只有一个消费者（Consumer）(即一旦被消费，消息就不再在消息队列中)发送者和接收者之间在时间上没有依赖性，也就是说当发送者发送了消息之后，不管接收者有没有正在运行，它不会影响到消息被发送到队列，接收者在成功接收消息之后需向队列应答成功。

引入三个jar包，这些jar包在activeMQ的安装包中都有：
geronimo-j2ee-management_1.1_spec-1.0.1.jar
geronimo-jms_1.1_spec-1.1.1.jar
activemq-core-5.5.0.jar

消息生产者：

package com.ds.test.activemq.queue;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class Sender {
    private static final int SEND_NUMBER = 5;

    public static void main(String[] args) {
        // ConnectionFactory ：连接工厂，JMS 用它创建连接
        ConnectionFactory connectionFactory;
        // Connection ：JMS 客户端到JMS Provider 的连接
        Connection connection = null;
        // Session： 一个发送或接收消息的线程
        Session session;
        // Destination ：消息的目的地;消息发送给谁.
        Destination destination;
        // MessageProducer：消息发送者
        MessageProducer producer;
        // TextMessage message;
        // 构造ConnectionFactory实例对象，此处采用ActiveMq的实现jar
        connectionFactory = new ActiveMQConnectionFactory(
                ActiveMQConnection.DEFAULT_USER,
                ActiveMQConnection.DEFAULT_PASSWORD,
                "tcp://localhost:61616");
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(Boolean.TRUE,
                    Session.AUTO_ACKNOWLEDGE);
            destination = session.createQueue("FirstQueue");
            producer = session.createProducer(destination);
            sendMessage(session, producer);
            session.commit();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != connection)
                    connection.close();
            } catch (Throwable ignore) {
            }
        }
    }

    public static void sendMessage(Session session, MessageProducer producer)
            throws Exception {
        for (int i = 1; i <= SEND_NUMBER; i++) {
            TextMessage message = session
                    .createTextMessage("ActiveMq 发送的消息" + i);
            // 发送消息到目的地方
            System.out.println("发送消息：" + "ActiveMq 发送的消息" + i);
            producer.send(message);
        }
    }
}

消息消费者：

package com.ds.test.activemq.queue;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.MessageConsumer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class Receiver {
    public static void main(String[] args) {
        // ConnectionFactory ：连接工厂，JMS 用它创建连接
        ConnectionFactory connectionFactory;
        // Connection ：JMS 客户端到JMS Provider 的连接
        Connection connection = null;
        // Session： 一个发送或接收消息的线程
        Session session;
        // Destination ：消息的目的地;消息发送给谁.
        Destination destination;
        // 消费者，消息接收者
        MessageConsumer consumer;
        connectionFactory = new ActiveMQConnectionFactory(
                ActiveMQConnection.DEFAULT_USER,
                ActiveMQConnection.DEFAULT_PASSWORD,
                "tcp://localhost:61616");
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(Boolean.FALSE,
                    Session.AUTO_ACKNOWLEDGE);
            destination = session.createQueue("FirstQueue");
            consumer = session.createConsumer(destination);
            while (true) {
                //接收在指定的超时间隔内到达的下一个消息
                TextMessage message = (TextMessage) consumer.receive(1000*100);
                if (null != message) {
                    System.out.println("收到消息" + message.getText());
                } else {
                    break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != connection)
                    connection.close();
            } catch (Throwable ignore) {
            }
        }
    }
}