Rabbitmq学习Demo

Rabbitmq 是一种在公司中很常见的消息队列，今天我简单写了一个demo ，消息发送，消息消费这个过程。

1，准备环境：

下载安装 rabbitmq (Mac) 网上百度一堆一堆，安装启动成功就OK

默认页面控制台端口为15672 http://localhost:15672/

PS：页面端口要和Mq 端口区别开页面端口15672 ，Mq端口5672

2，新建项目springboot

2.1, 引入maven依赖

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-amqp</artifactId>
	<version>2.2.0.RELEASE</version>
</dependency>

2.2，springboot 项目利用注解配置配置生产者Producer

package com.feijiang.washcar.configure;

import com.feijiang.washcar.BO.EventDetailMessages;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;
import java.util.Map;

@Configuration
public class ProducerConfiguration {


    @Bean
    public Queue mailQueue() {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("x-dead-letter-exchange", "dead_letter_exchange");//设置死信交换机
        map.put("x-dead-letter-routing-key", "mail_queue_fail");//设置死信routingKey
        Queue queue = new Queue(EventDetailMessages.QUEUE,true, false, false, map);
        return queue;
    }

    @Bean
    public DirectExchange mailExchange() {
        return new DirectExchange(EventDetailMessages.EXCHANGE, true, false);
    }

    @Bean
    public Binding mailBinding() {
        return BindingBuilder.bind(mailQueue()).to(mailExchange())
                .with(EventDetailMessages.KEY);
    }
    // 创建链接
    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setAddresses("127.0.0.1:5672");
        connectionFactory.setUsername("guest");
        connectionFactory.setPassword("guest");
        return connectionFactory;
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        return rabbitAdmin;
    }

    // 创建rabbitTemplate 消息模板类
    @Bean
    public RabbitTemplate rabbitTemplate() {
        RabbitTemplate template = new RabbitTemplate(connectionFactory());
        template.setMessageConverter(integrationEventMessageConverter());
        return template;
    }

    public MessageConverter integrationEventMessageConverter() {
        Jackson2JsonMessageConverter messageConverter = new Jackson2JsonMessageConverter();
        return messageConverter;
    }
}

PS :注意坑来了，Queue,Exchange ，Binding 如果你没有手动配置进行关联，就需要spring容器启动的时候将他们加载进去，相当于Queue,Exchange ，Binding初始化。创建CachingConnectionFactory时也容易将端口号写成 15672 （15672是控制台端口）

2.3 生产者类

@Slf4j
@RestController
public class HelloController  {


	@Autowired
    private RabbitTemplate rabbitTemplate;

	@GetMapping("/hello")
	public void get() {
		log.info("rabbitmq 发送消息 =========");
		rabbitTemplate.setExchange(EventDetailMessages.EXCHANGE);
		rabbitTemplate.setRoutingKey(EventDetailMessages.KEY);
		rabbitTemplate.setDefaultReceiveQueue(EventDetailMessages.QUEUE);
		Map<String,String> map = new HashMap<>();
		map.put("name","小宇");
		map.put("age","25");
		rabbitTemplate.convertAndSend(map);
		log.info("rabbitmq 发送消息成功 =========");
		return;
	}
	
}

现在启动服务，就可以生产消息了。

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2.4 配置消费者

package com.feijiang.washcar.configure;

import org.springframework.amqp.rabbit.annotation.RabbitListenerConfigurer;
import org.springframework.amqp.rabbit.listener.RabbitListenerEndpointRegistrar;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;
import org.springframework.messaging.handler.annotation.support.DefaultMessageHandlerMethodFactory;

@Configuration
public class RabbitListenerConfig implements RabbitListenerConfigurer {


    @Override
    public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
        registrar.setMessageHandlerMethodFactory(messageHandlerMethodFactory());
    }


    @Bean
    public DefaultMessageHandlerMethodFactory messageHandlerMethodFactory(){
        DefaultMessageHandlerMethodFactory defaultMessageHandlerMethodFactory = new DefaultMessageHandlerMethodFactory();
        defaultMessageHandlerMethodFactory.setMessageConverter(messageConverter());
        return defaultMessageHandlerMethodFactory;
    }



    @Bean
    public MappingJackson2MessageConverter messageConverter(){
        return new MappingJackson2MessageConverter();
    }
}

2.5 消费者类

package com.feijiang.washcar.schedule;

import com.feijiang.washcar.BO.EventDetailMessages;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class DemoListener {


    @RabbitListener(bindings = {
            @QueueBinding(value = @Queue(value = EventDetailMessages.QUEUE, durable = "true")
                    , exchange = @Exchange(value = EventDetailMessages.EXCHANGE)
                    , key = EventDetailMessages.KEY)
    })
    public void handlerArc(Object o) {

        log.info("handlerArc Object = {}", o.toString());

        if (o == null) {
            log.warn("消息内容为空！");
        }
    }
}

PS：主要就是@RabbitListener 注解它指定哪个交换机绑定的队列进行消费

这就是简单的RabbitMq demo 未完待续

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