Java消息机制 ActiveMQ实例概述

Step1:下载安装

 Download URL : http://activemq.apache.org/download.html

 Version : apache-activemq-5.11.0-bin.zip

Step2: 运行ActiveMQ,启动服务

   基于电脑不同位数，运行win32或者win64目录下的activemq.bat

Step3：客户端界面

  URL: http://localhost:8161/admin/     

 用户名&密码:admin/admin

Step4: ActiveMQ API使用

Maven依赖:

<dependencies><!-- https://mvnrepository.com/artifact/org.apache.activemq/activemq-all --><dependency><groupId>org.apache.activemq</groupId><artifactId>activemq-all</artifactId><version>5.11.0</version></dependency></dependencies>

1.基于点对点的模式

消息生产者:

package com.harry.activitymq.demo;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageProducer;import javax.jms.Session;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;/** * 消息生产者 * @author Harry Wan * */public class JMSProducer {public static final String USERNAME = ActiveMQConnection.DEFAULT_USER; //apache默认提供的用户名public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;//apache默认提供的密码public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;//默认的链接地址，消息总线(failover://tcp://localhost:61616)public static final Integer SEND_COUNT = 10; //发送10条消息public static void main(String[] args) {try {//实例化链接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);//通过链接工厂获取链接Connection connection = connectionFactory.createConnection();//启动链接connection.start();//创建session消息总线,true=是否启动事物，Session.AUTO_ACKNOWLEDGE = 自动确认客户端受到的消息 Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);//通过session创建消息队列，指向消息的目的地址Destination destination = session.createQueue("First");//创建消息生产者MessageProducer messageProducer = session.createProducer(destination);for (int i = 0; i < SEND_COUNT; i++) {//Session  创建消息实体Message msg = session.createTextMessage("ActivityMQ Send Msg: " + i);//生产者发送消息messageProducer.send(msg);//添加了事物，最后提交发送session.commit();System.out.println("Message has been sent: " + i );}} catch (JMSException e) {e.printStackTrace();}}}

消息消费者:

package com.harry.activitymq.demo;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.MessageConsumer;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;/** * 消息的消费者(点对点方式) *  * @author Harry Wan * */public class JMSConsumer {public static final String USERNAME = ActiveMQConnection.DEFAULT_USER; // apache默认提供的用户名public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;// apache默认提供的密码public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;// 默认的链接地址，消息总线(failover://tcp://localhost:61616)public static void main(String[] args) {try {//实例化链接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);//通过链接工厂获取链接Connection connection = connectionFactory.createConnection();//启动链接connection.start();Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);//通过session创建消息队列，指向消息的目的地址Destination destination = session.createQueue("First");//创建消息的消费者MessageConsumer  messageConsumer = session.createConsumer(destination);for (;;) {TextMessage textMessage = (TextMessage)messageConsumer.receive(1000);// 每隔1000ms接受一次if(textMessage != null){System.out.println("收到的消息: " + textMessage.getText());}else{break;}}} catch (JMSException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

注: 这里消息的消费者,一直处于无限循环的方式每隔1000ms接收一次消息，实际开发中通常是使用注册监听的方式，当有消息产生时,触发监听器从而接受消息。

监听器实现:

package com.harry.activitymq.demo;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageListener;import javax.jms.TextMessage;public class Listener implements MessageListener {/** * 消息监听 */public void onMessage(Message message) {try {System.out.println("收到的消息: " + ((TextMessage) message).getText());} catch (JMSException e) {e.printStackTrace();}}}

向消息的消费者注册监听,代替无限循环的接受方式:

try {//实例化链接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);//通过链接工厂获取链接Connection connection = connectionFactory.createConnection();//启动链接connection.start();Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);//通过session创建消息队列，指向消息的目的地址Destination destination = session.createQueue("First");//创建消息的消费者MessageConsumer  messageConsumer = session.createConsumer(destination);messageConsumer.setMessageListener(new Listener());//注册消息监听} catch (JMSException e) {// TODO Auto-generated catch blocke.printStackTrace();}

2.基于发布订阅的模式

消息发布者:

package com.harry.activitymq.publish.demo;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageProducer;import javax.jms.Session;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;/** * 消息发布者 * @author Harry Wan * */public class JMSPublisher {public static final String USERNAME = ActiveMQConnection.DEFAULT_USER; //apache默认提供的用户名public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;//apache默认提供的密码public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;//默认的链接地址，消息总线(failover://tcp://localhost:61616)public static final Integer SEND_COUNT = 10; //发送10条消息public static void main(String[] args) {try {//实例化链接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);//通过链接工厂获取链接Connection connection = connectionFactory.createConnection();//启动链接connection.start();//创建session消息总线,true=是否启动事物，Session.AUTO_ACKNOWLEDGE = 自动确认客户端受到的消息 Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);//通过session创建消息队列，指向消息的目的地址//Destination destination = session.createQueue("First");Destination destination = session.createTopic("FirstTopic");//创建消息生产者MessageProducer messageProducer = session.createProducer(destination);for (int i = 0; i < SEND_COUNT; i++) {//Session  创建消息实体Message msg = session.createTextMessage("ActivityMQ Send Msg: " + i);//生产者发送消息messageProducer.send(msg);//添加了事物，最后提交发送session.commit();System.out.println("Message has been publish: " + i );}} catch (JMSException e) {e.printStackTrace();}}}

消息的订阅者:

package com.harry.activitymq.publish.demo;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.MessageConsumer;import javax.jms.Session;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;/** * 消息的订阅者(发布订阅方式) *  * @author Harry Wan * */public class JMSubscriber {public static final String USERNAME = ActiveMQConnection.DEFAULT_USER; // apache默认提供的用户名public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;// apache默认提供的密码public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;// 默认的链接地址，消息总线(failover://tcp://localhost:61616)public static void main(String[] args) {try {//实例化链接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME,PASSWORD,BROKER_URL);//通过链接工厂获取链接Connection connection = connectionFactory.createConnection();//启动链接connection.start();Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);//通过session创建消息队列，指向消息的目的地址//Destination destination = session.createQueue("First");//创建消息订阅者Destination destination = session.createTopic("FirstTopic");//创建消息的消费者MessageConsumer  messageConsumer = session.createConsumer(destination);messageConsumer.setMessageListener(new Listener());//注册消息监听} catch (JMSException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

相比较于点对点的发送，主要是将创建的消息队列改为创建会话,发布会话所有的订阅者都能接收，1对多模式

实际开发中用的比较多的也是发布订阅模式

Final: 消息的状态,以及消息的发布者,消费者,消息队列等均可以在客户端界面进行管理！！