activeMQ初学

最近项目中可能会用到队列，特网上一番查找，发现Apache的ActiveMQ还不错，便尝试了一把。

一、下载Apache ActiveMQ

https://repository.apache.org/content/repositories/snapshots/org/apache/activemq/apache-activemq/5.10-SNAPSHOT/

最新的稳定版是5.10：

二、建立消费者类

package com.test;

import javax.jms.Connection;
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 ConsumerTool  implements MessageListener  {
	private String user = ActiveMQConnection.DEFAULT_USER;     
    
    private String password = ActiveMQConnection.DEFAULT_PASSWORD;     
    
    private String url = ActiveMQConnection.DEFAULT_BROKER_URL;     
    
    private String subject = "TOOL.DEFAULT";     
    
    private Destination destination = null;     
    
    private Connection connection = null;     
    
    private Session session = null;     
    
    private MessageConsumer consumer = null;     
    
    // 初始化     
    private void initialize() throws JMSException, Exception {  
     //连接工厂是用户创建连接的对象，这里使用的是ActiveMQ的ActiveMQConnectionFactory根据url，username和password创建连接工厂。  
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(     
                user, password, url);   
        //连接工厂创建一个jms connection  
        connection = connectionFactory.createConnection();     
        //是生产和消费的一个单线程上下文。会话用于创建消息的生产者，消费者和消息。会话提供了一个事务性的上下文。  
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);  //不支持事务   
        //目的地是客户用来指定他生产消息的目标还有他消费消息的来源的对象，两种消息传递方式：点对点和发布/订阅  
        destination = session.createQueue(subject);   
        //会话创建消息的生产者将消息发送到目的地  
        consumer = session.createConsumer(destination);     
             
    }     
    
    // 消费消息     
    public void consumeMessage() throws JMSException, Exception {     
        initialize();     
        connection.start();     
             
        System.out.println("Consumer:->Begin listening...");     
        // 开始监听     
        consumer.setMessageListener(this);     
        //Message message = consumer.receive();     
        
    }     
    
    // 关闭连接     
    public void close() throws JMSException {     
        System.out.println("Consumer:->Closing connection");     
        if (consumer != null)     
            consumer.close();     
        if (session != null)     
            session.close();     
        if (connection != null)     
            connection.close();     
    }     
    
    // 消息处理函数     
    @Override
    public void onMessage(Message message) {     
        try {     
            if (message instanceof TextMessage) {     
                TextMessage txtMsg = (TextMessage) message;     
                String msg = txtMsg.getText();     
                System.out.println("Consumer:->Received: " + msg);     
            } else {     
                System.out.println("Consumer:->Received: " + message);     
            }     
        } catch (JMSException e) {     
            // TODO Auto-generated catch block     
            e.printStackTrace();     
        }     
    }

}

三、建立生产者类

package com.test;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
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 ProducerTool {
	private String user = ActiveMQConnection.DEFAULT_USER;     
    
    private String password = ActiveMQConnection.DEFAULT_PASSWORD;     
    
    private String url = ActiveMQConnection.DEFAULT_BROKER_URL;     
    
    private String subject = "TOOL.DEFAULT";     
    
    private Destination destination = null;     
    
    private Connection connection = null;     
    
    private Session session = null;     
    
    private MessageProducer producer = null;     
    
    // 初始化     
    private void initialize() throws JMSException, Exception {     
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(     
                user, password, url);     
        connection = connectionFactory.createConnection();     
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);     
        destination = session.createQueue(subject);     
        producer = session.createProducer(destination);     
        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);     
    }     
    
    // 发送消息     
    public void produceMessage(String message) throws JMSException, Exception {     
        initialize();     
        TextMessage msg = session.createTextMessage(message);     
        connection.start();     
        System.out.println("Producer:->Sending message: " + message);     
        producer.send(msg);     
        System.out.println("Producer:->Message sent complete!");     
    }     
    
    // 关闭连接     
    public void close() throws JMSException {     
        System.out.println("Producer:->Closing connection");     
        if (producer != null)     
            producer.close();     
        if (session != null)     
            session.close();     
        if (connection != null)     
            connection.close();     
    }  
}

四、编写测试类

package com.test;

import javax.jms.JMSException;

import org.apache.activemq.ActiveMQConnection;

public class Test {
	 /**   
     * @param args   
     */    
    public static void main(String[] args) throws JMSException, Exception {     
       
     // TODO Auto-generated method stub     
        ConsumerTool consumer = new ConsumerTool();     
        ProducerTool producer = new ProducerTool();    
        System.out.println(ActiveMQConnection.DEFAULT_BROKER_URL+"------------");  
        // 开始监听     
        consumer.consumeMessage();
        // 延时500毫秒之后发送消息     
        Thread.sleep(500);     
        
        for (int i = 0; i < 10; i++) {
        	producer.produceMessage("Hello, world! " + i);     
        }
        
        producer.close(); 
             
        // 延时500毫秒之后停止接受消息     
        Thread.sleep(500);     
         consumer.close();     
    }  
}

在运行测试类之前，需要启动Apache  activeMQ服务,如下图所示,双击穷的那个activemq.bat启动MQ消息服务：

启动后，在浏览器中输入http://127.0.0.1:8161/，如能访问，则说明启动成功：

五、运行测试类中的main方法，变可以看到运行结果：