这篇文章带你了解怎么整合RabbitMQ服务器,并且通过它怎么去发送和接收消息。我将构建一个springboot工程,通过RabbitTemplate去通过MessageListenerAdapter去订阅一个POJO类型的消息。需要JAVA Spring Cloud大型企业分布式微服务云构建的B2B2C电子商务平台源码:三五三六二四七二五九

准备工作
15min
IDEA
maven 3.0
在开始构建项目之前,机器需要安装rabbitmq,你可以去官网下载,http://www.rabbitmq.com/download.html ,如果你是用的Mac(程序员都应该用mac吧),你可以这样下载:
brew install rabbitmq
安装完成后开启服务器:
rabbitmq-server
开启服务器成功,你可以看到以下信息:

RabbitMQ 3.1.3. Copyright (C) 2007-2013 VMware, Inc.
##  ##      Licensed under the MPL.  See http://www.rabbitmq.com/
##  ##
##########  Logs: /usr/local/var/log/rabbitmq/[email protected]
######  ##        /usr/local/var/log/rabbitmq/[email protected]
##########
            Starting broker... completed with 6 plugins.

构建工程
构架一个SpringBoot工程,其pom文件依赖加上spring-boot-starter-amqp的起步依赖:


            org.springframework.boot
            spring-boot-starter-amqp
        

创建消息接收者
在任何的消息队列程序中,你需要创建一个消息接收者,用于响应发送的消息。

@Component
public class Receiver {

    private CountDownLatch latch = new CountDownLatch(1);

    public void receiveMessage(String message) {
        System.out.println("Received <" + message + ">");
        latch.countDown();
    }

    public CountDownLatch getLatch() {
        return latch;
    }

}

消息接收者是一个简单的POJO类,它定义了一个方法去接收消息,当你注册它去接收消息,你可以给它取任何的名字。了解springcloud架构可以加求求:三五三六二四七二五九。其中,它有CountDownLatch这样的一个类,它是用于告诉发送者消息已经收到了,你不需要在应用程序中具体实现它,只需要latch.countDown()就行了。

创建消息监听,并发送一条消息
在spring程序中,RabbitTemplate提供了发送消息和接收消息的所有方法。你只需简单的配置下就行了:

需要一个消息监听容器
声明一个quene,一个exchange,并且绑定它们
一个组件去发送消息
代码清单如下:

package com.forezp;

import com.forezp.message.Receiver;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class SpringbootRabbitmqApplication {

     final static String queueName = "spring-boot";

    @Bean
    Queue queue() {
        return new Queue(queueName, false);
    }

    @Bean
    TopicExchange exchange() {
        return new TopicExchange("spring-boot-exchange");
    }

    @Bean
    Binding binding(Queue queue, TopicExchange exchange) {
        return BindingBuilder.bind(queue).to(exchange).with(queueName);
    }

    @Bean
    SimpleMessageListenerContainer container(ConnectionFactory connectionFactory,
                                             MessageListenerAdapter listenerAdapter) {
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.setQueueNames(queueName);
        container.setMessageListener(listenerAdapter);
        return container;
    }

    @Bean
    MessageListenerAdapter listenerAdapter(Receiver receiver) {
        return new MessageListenerAdapter(receiver, "receiveMessage");
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringbootRabbitmqApplication.class, args);
    }
}