PS: 讲个故事，老王要给他的两个女儿讲故事，他要一个一个讲很费劲，后来他使用了微信公众号，让订阅微信公众号的人关注就减轻了负担。
PS: 传统的如果一个用户进行登录，会调用分多的服务，如果没有消息中间件等待的时间就会很长（这样同步的效率很低），有了消息中间件首先
能有异步的保证登录，然后还能保证服务不会被一个一个执行
PS:生活中的应用
PS: kafka性能高，但是数据会丢失
rabbitmp保证数据不丢失，性能比activemq强
activeMq满足80%以上的业务场景
关于消息队列的介绍----ActiveMQ，RabbitMQ，ZeroMQ，Kafka，MetaMQ，RocketMQ
PS: JMS是一种规范，不同的公司有不同的实现，其中最常用的是ActiveMQ， 类似于JDBC感觉
队列是一两万，消息流量几十万条也是可以使用的
PS： 也就是对方不在的时候也可以发送
PS: JMS规定点对点 和 发布和订阅模式， 如果是点对点的模式就把数据扔到 Queue中，如果是 发布订阅就发送到topic中；
消息中间件可以理解为 数据库，通过ConnecttionFactory连接，从而获得一个Connecttion，然后把消息发送到指定的目的地
--------------------------------------------------------------------------------------------
PS:这是Java Message Service的体系。
PS:体系架构是重点，分为消费者和发送者两者。统称为客户
PS: 消息的两种模式 ： 队列和话题
1.下载ActiveMQ
去官方网站下载：http://activemq.apache.org/
2.运行ActiveMQ
解压缩apache-activemq-5.5.1-bin.zip，
PS :要用这个老版本的； 后来学习的时候使用5.11.1
修改配置文件activeMQ.xml，将0.0.0.0修改为localhost
|
<transportConnectors> <transportConnector name="openwire" uri="tcp://localhost:61616"/> <transportConnector name="ssl" uri="ssl://localhost:61617"/> <transportConnector name="stomp" uri="stomp://localhost:61613"/> <transportConnector uri="http://localhost:8081"/> <transportConnector uri="udp://localhost:61618"/> |
然后双击apache-activemq-5.5.1inactivemq.bat运行ActiveMQ程序。
启动ActiveMQ以后，登陆：http://localhost:8161/admin/，创建一个Queue，命名为FirstQueue。
PS:不会的话，直接看百度怎么配置JMS
1.安装包2.修改配置 3.bat启动 4.执行代码看业务流程
PS :安全机制主要是配置用户
PS: 配置好的话，会自动创建三个表，处理完数据以后自动会清空
PS: 事物的设置主要在发送端， 最后一种提交方式用的比较少
------------------------------------------------------------------------------------------------------------------------------------------------------
PS:JMS用在J2EE生产环境中，kafka用在大数据开发环境中 。 都是消息队列的处理。。。。
PS:比如上图，在web系统接收数据，然后会生成相应的日志文件，应用kafka读取数据，然后再执行相应的业务处理。
package cn.itcast_03_mq.topic; 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 = "mytopic"; 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.createTopic(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(); } }
package cn.itcast_03_mq.topic; import java.util.Random; import javax.jms.JMSException; public class ProducerTest { /** * @param args */ public static void main(String[] args) throws JMSException, Exception { ProducerTool producer = new ProducerTool(); Random random = new Random(); for(int i=0;i<20;i++){ Thread.sleep(random.nextInt(10)*1000); producer.produceMessage("Hello, world!--"+i); producer.close(); } } }
package cn.itcast_03_mq.topic; import javax.jms.Connection; import javax.jms.Destination; import javax.jms.ExceptionListener; import javax.jms.JMSException; import javax.jms.MessageConsumer; import javax.jms.Session; import javax.jms.MessageListener; import javax.jms.Message; import javax.jms.TextMessage; import org.apache.activemq.ActiveMQConnection; import org.apache.activemq.ActiveMQConnectionFactory; public class ConsumerTool implements MessageListener,ExceptionListener {
//这些都是体系架构的东西 private String user = ActiveMQConnection.DEFAULT_USER; private String password = ActiveMQConnection.DEFAULT_PASSWORD; private String url =ActiveMQConnection.DEFAULT_BROKER_URL; private String subject = "mytopic"; private Destination destination = null; private Connection connection = null; private Session session = null; private MessageConsumer consumer = null; public static Boolean isconnection=false; // 初始化 private void initialize() throws JMSException, Exception { ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory( user, password, url); //创建工厂 connection = connectionFactory.createConnection(); //创建链接 session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); destination = session.createTopic(subject); consumer = session.createConsumer(destination); } // 消费消息 public void consumeMessage() throws JMSException, Exception { initialize(); connection.start(); consumer.setMessageListener(this); //监听消息 connection.setExceptionListener(this);//异常监听 isconnection=true; System.out.println("Consumer:->Begin listening..."); // 开始监听 // 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 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(); } } public void onException(JMSException arg0) { isconnection=false; } }
package cn.itcast_03_mq.topic; import javax.jms.JMSException; public class ConsumerTest implements Runnable { static Thread t1 = null; /** * @param args * @throws InterruptedException * @throws InterruptedException * @throws JMSException * @throws InterruptedException */ public static void main(String[] args) throws InterruptedException { t1 = new Thread(new ConsumerTest()); t1.setDaemon(false); t1.start(); /** * 如果发生异常，则重启consumer */ /*while (true) { System.out.println(t1.isAlive()); if (!t1.isAlive()) { t1 = new Thread(new ConsumerTest()); t1.start(); System.out.println("重新启动"); } Thread.sleep(5000); }*/ // 延时500毫秒之后停止接受消息 // Thread.sleep(500); // consumer.close(); } public void run() { try { ConsumerTool consumer = new ConsumerTool(); consumer.consumeMessage(); while (ConsumerTool.isconnection) { } } catch (Exception e) { } } }
PS:此为程序启动以后监听的效果
SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/D:/All_Downloads/BaiduYunDownload/chuanzhiboke%e5%a4%a7%e6%95%b0%e6%8d%ae/%e8%a7%86%e9%a2%91/day04%e5%b9%b6%e5%8f%91/day04/%e4%bb%a3%e7%a0%81/1-cloudDay04/lib/activemq-all-5.9.0.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/D:/All_Downloads/BaiduYunDownload/chuanzhiboke%e5%a4%a7%e6%95%b0%e6%8d%ae/%e8%a7%86%e9%a2%91/day04%e5%b9%b6%e5%8f%91/day04/%e4%bb%a3%e7%a0%81/1-cloudDay04/lib/slf4j-simple-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory] 2017-11-16 19:12:57,790 [ActiveMQ Task-1] INFO org.apache.activemq.transport.failover.FailoverTransport.doReconnect(FailoverTransport.java:1040) method:doReconnect Successfully connected to tcp://localhost:61616 Consumer:->Begin listening... Consumer:->Received: Hello, world!--0 Consumer:->Received: Hello, world!--1 Consumer:->Received: Hello, world!--2 Consumer:->Received: Hello, world!--3 Consumer:->Received: Hello, world!--4 Consumer:->Received: Hello, world!--5 Consumer:->Received: Hello, world!--6 Consumer:->Received: Hello, world!--7 Consumer:->Received: Hello, world!--8 Consumer:->Received: Hello, world!--9 Consumer:->Received: Hello, world!--10 Consumer:->Received: Hello, world!--11 Consumer:->Received: Hello, world!--12 Consumer:->Received: Hello, world!--13 Consumer:->Received: Hello, world!--14 Consumer:->Received: Hello, world!--15 Consumer:->Received: Hello, world!--16 Consumer:->Received: Hello, world!--17 Consumer:->Received: Hello, world!--18 Consumer:->Received: Hello, world!--19
PS ：总结
PS: activemp只是用在javaee中，在现实生产中目前都用kafka了
PS:JMS用在J2EE生产环境中，kafka用在大数据开发环境中 。 都是消息队列的处理。。。。
PS:比如上图，在web系统接收数据，然后会生成相应的日志文件，应用kafka读取数据，然后再执行相应的业务处理。
下面介绍spring Jms理论
步骤
1.配置spring application.xml
PS :动态可以拓展
