ActiveMQ初体验

0.前文

http://blog.csdn.net/caicongyang/article/details/50650136

链接地址的文章是我个人利用DelayQueue实现的简易版MQ，获取有助于你理解ActiveMQ;

1.ActiveMQ

Java消息服务（Java Message Service，JMS）应用程序接口是一个Java平台中关于面向消息中间件（MOM）的API，用于在两个应用程序之间，或分布式系统中发送消息，进行异步通信。Java消息服务是一个与具体平台无关的API，绝大多数MOM提供商都对JMS提供支持。

     Java消息服务的规范包括两种消息模式，点对点和发布者／订阅者。

     Java消息服务支持同步和异步的消息处理。

2.安装（CentOS 6.7 final）

安装包：apache-activemq-5.13.1-bin.tar.gz

解压即可

#tar -zxvf apache-activemq-5.13.1-bin.tar.gz

3.启动

bin目录下的activemq启动文件

#./activemq start

4.启动测试

访问地址：http://192.168.150.138:8161/index.html

5.消息模型

P2P即点对点，也称请求应答

Sender.java

package com.caicongyang.demo;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
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 {
	public static void main(String[] args) {
		Sender sender = new Sender();
		String msg = "Hello World!";
		sender.send(msg);
		System.out.println("发送消息结束：" + msg);
	}

	public void send(String msg) {
		String user = ActiveMQConnection.DEFAULT_USER;
		String password = ActiveMQConnection.DEFAULT_PASSWORD;
		// DEFAULT_BROKER_URL =failover://tcp://localhost:61616
		String url = "failover://tcp://192.168.150.138:61616";
		String subject = "TOOL.DEFAULT";
		// 1. 初始化连接工厂
		ConnectionFactory contectionFactory = new ActiveMQConnectionFactory(user, password, url);
		try {
			// 2. 创建连接
			Connection connection = contectionFactory.createConnection();
			connection.start();
			// 3.创建会话
			Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
			// 4. 打开队列
			Destination destination = session.createQueue(subject);
			// 5. MessageProducer负责发送消息
			MessageProducer producer = session.createProducer(destination);
			TextMessage message = session.createTextMessage();
			for (int i = 0; i < 10; i++) {
				String tmp = i + ":" + msg;
				message.setStringProperty("hello", tmp);
				// 6. 发送消息
				producer.send(message);
				System.out.println("send: " + tmp);
				Thread.sleep(3000);
				// 只有commit之后，消息才会进入队列
				session.commit();
			}
			// 7. 关闭会话和连接
			session.close();
			connection.close();
		} catch (JMSException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}

Receiver.java

package com.caicongyang.demo;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
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) {
		String user = ActiveMQConnection.DEFAULT_USER;
		String password = ActiveMQConnection.DEFAULT_PASSWORD;
		// String url = ActiveMQConnection.DEFAULT_BROKER_URL;
		String url = "failover://tcp://192.168.150.138:61616";
		String subject = "TOOL.DEFAULT";
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, url);
		Connection connection;
		try {
			connection = connectionFactory.createConnection();
			connection.start();
			final Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
			Destination destination = session.createQueue(subject);
			// MessageConsumer负责接受消息
			MessageConsumer consumer = session.createConsumer(destination);
			consumer.setMessageListener(new MessageListener() {
				public void onMessage(Message msg) {
					TextMessage message = (TextMessage) msg;
					try {
						String hello = message.getStringProperty("hello");
						System.out.println("收到消息：\t" + hello);
						session.commit();
					} catch (JMSException e) {
						e.printStackTrace();
					}
				}
			});
			// 为了演示接受消息，这里把关闭会话和连接注释掉了。
			// session.close();
			// connection.close();
		} catch (JMSException e) {
			e.printStackTrace();
		}
	}
}

测试结果：

发布订阅模型

Publisher.java（发布者）

package com.caicongyang.demo;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class Publisher {
	
	public static void main(String[] args) {
		    Publisher pb = new Publisher();
		    String msg = "Hello World!~~~~~";
		    pb.sendMessage(msg);
		    System.out.println("发送消息结束：" + msg);
	}
	
	
	
	/**
	   * 使用JMS向MQ发送消息
	   * 
	   * @param msg 消息内容
	   */
	  public void sendMessage(String msg) {
	    // defualt user & password both are null
	    String user = ActiveMQConnection.DEFAULT_USER;
	    String password = ActiveMQConnection.DEFAULT_PASSWORD;
	    // DEFAULT_BROKER_URL =failover://tcp://localhost:61616
	    String url = "failover://tcp://192.168.150.138:61616";
	    String subject = "MQ.TOPIC";
	 
	    // 1. 初始化连接工厂
	    ConnectionFactory contectionFactory = new ActiveMQConnectionFactory(user, password, url);
	    try {
	      // 2. 创建连接
	      Connection connection = contectionFactory.createConnection();
	      connection.start();
	      // 3.创建会话
	      Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
	      // 4. 创建要发布的主题，和Queue的区别就在此
	      Destination destination = session.createTopic(subject);
	      // 5. MessageProducer负责发送消息
	      MessageProducer producer = session.createProducer(destination);
	      TextMessage message = session.createTextMessage();
	      message.setStringProperty("hello", msg);
	      // 6. 发送消息
	      producer.send(message);
	      // 7. 关闭会话和连接
	      session.commit();
	      session.close();
	      connection.close();
	    } catch (JMSException e) {
	      e.printStackTrace();
	    }
	  }
	}

Subscriber.java(订阅者)

package com.caicongyang.demo;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class Subscriber {
	public static void main(String[] args) {
		String user = ActiveMQConnection.DEFAULT_USER;
		String password = ActiveMQConnection.DEFAULT_PASSWORD;

		// String url = ActiveMQConnection.DEFAULT_BROKER_URL;
		String url = "failover://tcp://192.168.150.138:61616";
		String subject = "MQ.TOPIC";
		ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, url);
		Connection connection;
		try {
			connection = connectionFactory.createConnection();
			connection.start();
			final Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
			Topic topic = session.createTopic(subject);
			// MessageConsumer负责接受消息
			MessageConsumer consumer = session.createConsumer(topic);
			consumer.setMessageListener(new MessageListener() {
				public void onMessage(Message msg) {
					TextMessage message = (TextMessage) msg;
					try {
						String hello = message.getStringProperty("hello");
						System.out.println("订阅者---SecondSubscriber---收到消息：\t" + hello);
						session.commit();
					} catch (JMSException e) {
						e.printStackTrace();
					}
				}
			});
			// 为了测试效果，注释掉了两行代码，使Session和connection一直处于打开状态
			// session.close();
			// connection.close();
		} catch (JMSException e) {
			e.printStackTrace();
		}
	}
}

测试结果：

其他学习资源：

http://my.oschina.net/xiaoxishan/blog/378743

http://blog.csdn.net/column/details/activemq.html

http://www.cnblogs.com/chenying99/archive/2012/10/28/2744089.html（大全）

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