# 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;
}