RabbitMQ-Quick Start (1)

Modify in Order service

1. The first thing to use components is always to introduce dependencies first

2. Configure mq (can be placed directly on order.test.yml on git)

3. Write a method to receive messages MqReceiver, @RabbitListenner (queuesToDeclare = @ Queue (& quot; myQueue & quot;)), process ()

4. Write a sender using AmqpTemplate, send ()

Order

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

spring:
  rabbitmq:
    host: 127.0.0.1
    port: 5672
    username: guest
    password: guest

package com.imooc.order.message;

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;

/**
 * 接收mq消息
 */
@Slf4j
@Component
public class MqReceiver {

    //1. @RabbitListener(queues = "myQueue")
    //2. 自动创建队列 @RabbitListener(queuesToDeclare = @Queue("myQueue"))
    //3. 自动创建, Exchange和Queue绑定
    @RabbitListener(bindings = @QueueBinding(
            value = @Queue("myQueue"),
            exchange = @Exchange("myExchange")
    ))
    public void process(String message) {
        log.info("MqReceiver: {}", message);
    }

    /**
     * 数码供应商服务 接收消息
     * @param message
     */
    @RabbitListener(bindings = @QueueBinding(
            exchange = @Exchange("myOrder"),
            key = "computer",
            value = @Queue("computerOrder")
    ))
    public void processComputer(String message) {
        log.info("computer MqReceiver: {}", message);
    }


    /**
     * 水果供应商服务 接收消息
     * @param message
     */
    @RabbitListener(bindings = @QueueBinding(
            exchange = @Exchange("myOrder"),
            key = "fruit",
            value = @Queue("fruitOrder")
    ))
    public void processFruit(String message) {
        log.info("fruit MqReceiver: {}", message);
    }
}

package com.imooc.order;

import org.junit.Test;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Date;

/**
 * 发送mq消息测试
 */
@Component
public class MqSenderTest extends OrderApplicationTests {

    @Autowired
    private AmqpTemplate amqpTemplate;

    @Test
    public void send() {
        amqpTemplate.convertAndSend("myQueue", "now " + new Date());
    }

    @Test
    public void sendOrder() {
        amqpTemplate.convertAndSend("myOrder", "computer", "now " + new Date());
    }
}

 

When to use Exchange?

• EG orders can be divided into digital orders and fruit orders, and bind myOrder message queue through different keys. After the mall is bigger, it sells more, and you can place orders for a variety of commodities. Orders, merchants have team service. The order should send different messages according to different commodity types. At this time, the grouping of messages is involved, that is, the key of the route is about to change. The exchanger does not need to change. Then the key will change. To a different message queue is queue.