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SpringBoot非官方教程 | 第十五篇:Springboot整合RabbitMQ

2017-07-02 14:31 921 查看
转载请标明出处:

http://blog.csdn.net/forezp/article/details/71023692

本文出自方志朋的博客

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。


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
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安装完成后开启服务器:
rabbitmq-server
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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/rabbit@localhost.log
######  ##        /usr/local/var/log/rabbitmq/rabbit@localhost-sasl.log
##########
Starting broker... completed with 6 plugins.
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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:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
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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;
}

}
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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。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);
}
}
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[/code]

创建一个测试方法:
@Component
public class Runner implements CommandLineRunner {

private final RabbitTemplate rabbitTemplate;
private final Receiver receiver;
private final ConfigurableApplicationContext context;

public Runner(Receiver receiver, RabbitTemplate rabbitTemplate,
ConfigurableApplicationContext context) {
this.receiver = receiver;
this.rabbitTemplate = rabbitTemplate;
this.context = context;
}

@Override
public void run(String... args) throws Exception {
System.out.println("Sending message...");
rabbitTemplate.convertAndSend(Application.queueName, "Hello from RabbitMQ!");
receiver.getLatch().await(10000, TimeUnit.MILLISECONDS);
context.close();
}

}
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启动程序,你会发现控制台打印:
Sending message...
Received <Hello from RabbitMQ!>
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总结

恭喜!你刚才已经学会了如何通过spring raabitmq去构建一个消息发送和订阅的程序。 这仅仅是一个好的开始,你可以通过spring-rabbitmq做更多的事,点击这里

源码下载:https://github.com/forezp/SpringBootLearning


参考资料

https://spring.io/guides/gs/messaging-rabbitmq/
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标签:  springboot