上一篇文章我們使用spring + redis實現訊息的訂閱釋出，但是redis作為訊息元件僅適合輕量級的任務處理，例如：秒殺計數器、快取等，對於重量級，高併發的處理redis就稍顯劣勢。接下來我們spring+RabbiteMQ的實現。

準備

首先安裝ErLang環境，因為RabbiteMQ依賴ErLang，這裡我們使用windows環境，因為都有exe。
Erlang下載地址
RabbiteMQ下載地址

編碼

首先新增依賴jar包：

<dependency>
    <groupId>org.springframework.amqp</groupId
 
>
    <artifactId>spring-amqp</artifactId>
    <version>1.5.4.RELEASE </version>
</dependency>
<dependency>
    <groupId>org.springframework.amqp</groupId>
    <artifactId> spring-rabbit</artifactId>
    <version>1.5.4.RELEASE</version
 
>
</dependency>

接下來同上一篇文章一樣新增訊息接收類Receiver：

import java.util.concurrent.CountDownLatch;

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;
    }

}

最後來看一下訊息的傳送Application：

package rabbitmq;
import java.util.concurrent.TimeUnit;

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.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;

import ch.qos.logback.core.Context;

@SpringBootApplication
public class Application implements CommandLineRunner {

    final static String queueName = "spring-boot";


    @Autowired
    RabbitTemplate rabbitTemplate;

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

    @Bean
    AnnotationConfigApplicationContext context(){
        return new AnnotationConfigApplicationContext();
    }

    @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
    Receiver receiver() {
        return new Receiver();
    }

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

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

    @Override
    public void run(String... args) throws Exception {
        System.out.println("Waiting five seconds...");
        Thread.sleep(5000);
        System.out.println("Sending message...");
        rabbitTemplate.convertAndSend(queueName, "Hello from RabbitMQ!");
        receiver().getLatch().await(10000, TimeUnit.MILLISECONDS);
    }
}

最後一起看一下執行的結果：

Sending message...
Received <Hello from RabbitMQ!>