jms及active(jdk api)的实现
在企业中，分布式的消息队列需要实现的问题：
1、不同的业务系统分别处理同一个消息（订阅发布），同一个业务系统负载处理同一类消息（队列模式）
2、消息的一致性问题,在互联网公司中一般不要求强一致性，一般要求高性能，所以只需要每次轮询消息日志或消息存储文件，重新发送未一致的问题。（公司中出现过存储文件在集群数据库上的情况，然后由于读写分离，出现了消息重复发送的故障）
3、消息重复发送问题也称为消息的幂等性：解决重复问题可以让消费者在接受到消息后查看日志或文件是否消息已经被修改状态或删除。（公司的故障中，由于读写分离，所以消息状态还没来得及被更改，重复性检测就已经检测完了数据库中文件，导致的重复性问题仍然没被解决）
4、基于消息机制建立服务总线，主业务在接受消息后通知服务总线，服务总线通知旁支服务，而不是旁支服务长时间询问主服务。
一、jms：java message service java消息服务，他不是一种协议，而是一个api，用来服务于消息中间件的api；
二、消息中间件：为了异步可靠的在两个系统结构之间（泛指两个，可以多个）进行消息传输，令项目服务化，解耦性强。例如：我们有个登录系统，如果用户登录成功返回给用户成功提示之前会调用积分增加服务，日志服务等，这样一旦其中一个服务失效可能就会延迟用户获得登陆成功提示的时间，降低用户体验，所以我们可以异步将用户登录信息传输到附加服务中，只返回用户关心的登录信息。
三、常用的消息中间件：ActiveMQ、RabbitMQ、Kafka
四、以下为active利用jdk自带的jms实现，结合spring的请点击：
结构如下：
pom.xml文件：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zxc.jms</groupId> <artifactId>jms</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>javax.jms</groupId> <artifactId>javax.jms-api</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-core</artifactId> <version>5.7.0</version> </dependency> <!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.2</version> </dependency> </dependencies> </project>
log4j.properties:(用的是slf4j日志）如果是idea注意一定要放在resource下，如果用的是eclipse要放在src下
### 设置###
log4j.rootLogger = debug,stdout,D,E
### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
### 输出ERROR 级别以上的日志到=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =D://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
ActiveMQ分为两种类型：
第一种队列模式：点对点模式，一个消息生产者生产的消息存入消息队列中，然后可以有多个消费者的多个连接，这些连接基本平均分配这些消息。
第二种订阅发布模式：一定要订阅者(就是消费者）先要订阅队列，然后发布者发布消息存入队列，订阅者全部接受所有队列消息，不会均分。
第一种的队列模式：
appProducer:
package com.zxc.jms.queue; import javax.jms.*; import org.apache.activemq.ActiveMQConnectionFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class appProducer { private static String url = "tcp://localhost:61616"; private static String queuename = "queue-test"; private static Logger logger = LoggerFactory.getLogger(appProducer.class); public static void main(String[] args) throws JMSException { ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); Connection connection = connectionFactory.createConnection(); connection.start(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); Destination destination = session.createQueue(queuename); MessageProducer producer = session.createProducer(destination); for (int i = 1; i <= 10000; i++) { TextMessage message = session.createTextMessage("生产者发出第" + i + "消息"); producer.send(message); logger.info("生产者发出的第{}条数据", i); } connection.close(); } }
appConsumer:
package com.zxc.jms.queue; import javax.jms.*; import org.apache.activemq.ActiveMQConnectionFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class appConsumer { private static String url = "tcp://localhost:61616"; private static String queuename = "queue-test"; private static Logger logger = LoggerFactory.getLogger(appProducer.class); public static void main(String[] args) throws JMSException { ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); Connection connection = connectionFactory.createConnection(); connection.start(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); Destination destination = session.createQueue(queuename); MessageConsumer consumer = session.createConsumer(destination); consumer.setMessageListener(new MessageListener() { @Override public void onMessage(Message message) { TextMessage textMessage = (TextMessage) message; logger.info("接受者接到消息"); } }); } }
第二种：订阅发布模式
appProducer:
package com.zxc.topic; import javax.jms.*; import org.apache.activemq.ActiveMQConnectionFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class appProducer { private static final String url = "tcp://localhost:61616"; private static final String topicName = "topic-test"; private static final Logger logger = LoggerFactory.getLogger(appProducer.class); public static void main(String[] args) throws JMSException, InterruptedException { ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); Connection connection = connectionFactory.createConnection(); connection.start(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); Topic topic = session.createTopic(topicName); MessageProducer producer = session.createProducer(topic); for (int i = 0; i <= 100; i++) { TextMessage message = session.createTextMessage("消息"+i); producer.send(message); logger.info("生产者广播第{}条消息",i); Thread.sleep(2000); } connection.close(); } }
appConsumer:
package com.zxc.topic; import javax.jms.*; import org.apache.activemq.ActiveMQConnectionFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class appConsumer { private static final String url = "tcp://localhost:61616"; private static final String topicName = "topic-test"; private static final Logger logger = LoggerFactory.getLogger(appProducer.class); public static void main(String[] args) throws JMSException { ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url); Connection connection = connectionFactory.createConnection(); connection.start(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); Topic topic = session.createTopic(topicName); MessageConsumer consumer = session.createConsumer(topic); consumer.setMessageListener((message -> { TextMessage textMessage = (TextMessage) message; try { logger.info("收到消息：{}",textMessage.getText()); } catch (JMSException e) { e.printStackTrace(); } })); } }
