# JMS,AMQP,MQTT的区别与联系
- JMS
Java消息传递服务（Java Messaging Service ） - AMQP
高级消息队列协议（Advanced Message Queueing Protocol ） - MQTT
消息队列遥测传输（Message Queueing Telemetry Transport ）
简单理解：
JMS是专门为Java设计的一套消息服务API，像ActiveMQ就是对它的实现AMQP为了解决不同平台之间的通信问题，定义了一种名为amqp的通信协议，从而实现平台和语言无关性。
MQTT也是一种通信协议。相比于AMQP的复杂性，它简单的多。所以amqp用于处理相对较重的任务，如两个系统平台之间的消息传输。而mqtt因为非常轻量，所以大量应用于物联网*。
# RabbitMQ常用命令
- 修改密码
rabbitmqctl change_password Username Newpassword - 显示所有用户
rabbitmqctl list_users - 启动
rabbitmq-server start - 关闭
rabbitmqctl stop - homebrew安装配置文件地址
/usr/local/etc/rabbitmq/rabbitmq-env.conf - 管理平台地址
http://localhost:15672/
1. 简单模型
The simplest thing that does something
- 模型图示
- 生产者
package com.futao.springmvcdemo.mq.rabbit.simple; import com.futao.springmvcdemo.mq.rabbit.RabbitMqConnectionTools; import com.futao.springmvcdemo.mq.rabbit.RabbitMqQueueEnum; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import lombok.Cleanup; import lombok.SneakyThrows; import lombok.extern.slf4j.Slf4j; /** * 简单发送者 * * @author futao * Created on 2019-04-22. */ @Slf4j public class Send { @SneakyThrows public static void main(String[] args) { @Cleanup Connection connection = RabbitMqConnectionTools.getConnection(); @Cleanup Channel channel = connection.createChannel(); //定义一个队列 channel.queueDeclare(RabbitMqQueueEnum.SIMPLE.getQueueName(), false, false, false, null); String msg = "Hello RabbitMq!"; channel.basicPublish("", RabbitMqQueueEnum.SIMPLE.getQueueName(), null, msg.getBytes()); log.info("Send msg:[{}] success", msg); } }
- 消费者
package com.futao.springmvcdemo.mq.rabbit.simple; import com.futao.springmvcdemo.mq.rabbit.RabbitMqConnectionTools; import com.futao.springmvcdemo.mq.rabbit.RabbitMqQueueEnum; import com.rabbitmq.client.Channel; import com.rabbitmq.client.DeliverCallback; import lombok.SneakyThrows; import lombok.extern.slf4j.Slf4j; /** * 简单消费者 * * @author futao * Created on 2019-04-22. */ @Slf4j public class Recv { @SneakyThrows public static void main(String[] args) { Channel channel = RabbitMqConnectionTools.getChannel(); channel.queueDeclare(RabbitMqQueueEnum.SIMPLE.getQueueName(), false, false, false, null); log.info("Waiting for message..."); DeliverCallback deliverCallback = ((consumerTag, message) -> { log.info("收到消息:[{}],tag:[{}]", new java.lang.String(message.getBody()), consumerTag); }); channel.basicConsume(RabbitMqQueueEnum.SIMPLE.getQueueName(), true, deliverCallback, consumerTag -> { }); } }
- 特点：一对一。一个生产者，一个消费者。
# 通用代码
- 工具类 - 链接工厂
package com.futao.springmvcdemo.mq.rabbit; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import lombok.SneakyThrows; import java.io.IOException; import java.util.concurrent.TimeoutException; /** * rabbitMq配置类 * * @author futao * Created on 2019-04-19. */ public class RabbitMqConnectionTools { /** * 获取链接 * * @return * @throws IOException * @throws TimeoutException */ public static Connection getConnection() { try { return getConnectionFactory().newConnection(); } catch (IOException | TimeoutException e) { e.printStackTrace(); throw new RuntimeException(e.getMessage(), e); } } /** * 连接工厂 * * @return */ private static ConnectionFactory getConnectionFactory() { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); factory.setPort(5672); factory.setUsername("futao"); factory.setPassword("123456"); factory.setVirtualHost("/springmvc"); return factory; } /** * 创建并获取通道 * * @return */ @SneakyThrows public static Channel getChannel() { Connection connection = RabbitMqConnectionTools.getConnection(); return connection.createChannel(); } }
- 枚举类 - RabbitMqQueueEnum队列名称
package com.futao.springmvcdemo.mq.rabbit; import lombok.AllArgsConstructor; import lombok.Getter; /** * queue名称枚举 * * @author futao * Created on 2019-04-19. */ @Getter @AllArgsConstructor public enum RabbitMqQueueEnum { /** * 简单queue */ SIMPLE("simple-queue"), /** * WorkQueue 工作队列 */ WORK_QUEUE("work-queue"), /** * 发布订阅-fanout */ EXCHANGE_QUEUE_FANOUT_ONE("exchange-queue-fanout-1"), EXCHANGE_QUEUE_FANOUT_TWO("exchange-queue-fanout-2"), EXCHANGE_QUEUE_DIRECT_ONE("exchange-queue-direct-1"), EXCHANGE_QUEUE_DIRECT_TWO("exchange-queue-direct-2"), EXCHANGE_QUEUE_TOPIC_ONE("exchange-queue-topic-1"), EXCHANGE_QUEUE_TOPIC_TWO("exchange-queue-topic-2"), EXCHANGE_QUEUE_TOPIC_THREE("exchange-queue-topic-3"), EXCHANGE_QUEUE_TOPIC_FOUR("exchange-queue-topic-4"), /** * RPC队列 */ RPC_QUEUE("rpc-queue"); /** * queue名称 */ private String queueName; }
