SpringCloud分佈式微服務b2b2c電子商務(十三)Springboot 整RabbitMQ

這篇文章帶你瞭解怎麼整合RabbitMQ服務器,而且經過它怎麼去發送和接收消息。我將構建一個springboot工程,經過RabbitTemplate去經過MessageListenerAdapter去訂閱一個POJO類型的消息。須要JAVA Spring Cloud大型企業分佈式微服務雲構建的B2B2C電子商務平臺源碼:三五三六二四七二五九html

準備工做
15min
IDEA
maven 3.0
在開始構建項目以前,機器須要安裝rabbitmq,你能夠去官網下載,http://www.rabbitmq.com/download.html ,若是你是用的Mac(程序員都應該用mac吧),你能夠這樣下載:
brew install rabbitmq
安裝完成後開啓服務器:
rabbitmq-server
開啓服務器成功,你能夠看到如下信息:程序員

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/rabbit@localhost.log
######  ##        /usr/local/var/log/rabbitmq/rabbit@localhost-sasl.log
##########
            Starting broker... completed with 6 plugins.

構建工程
構架一個SpringBoot工程,其pom文件依賴加上spring-boot-starter-amqp的起步依賴:spring

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

建立消息接收者
在任何的消息隊列程序中,你須要建立一個消息接收者,用於響應發送的消息。springboot

@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;
    }

}

消息接收者是一個簡單的POJO類,它定義了一個方法去接收消息,當你註冊它去接收消息,你能夠給它取任何的名字。瞭解springcloud架構能夠加求求:三五三六二四七二五九。其中,它有CountDownLatch這樣的一個類,它是用於告訴發送者消息已經收到了,你不須要在應用程序中具體實現它,只須要latch.countDown()就好了。服務器

建立消息監聽,併發送一條消息
在spring程序中,RabbitTemplate提供了發送消息和接收消息的全部方法。你只需簡單的配置下就好了:架構

須要一個消息監聽容器
聲明一個quene,一個exchange,而且綁定它們
一個組件去發送消息
代碼清單以下:併發

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);
    }
}
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