在Order服务中修改
1. 使用组件第一件事永远是先引入依赖
2. 配置mq(可以直接放到git上的order.test.yml上)
3. 写一个接收消息的方法MqReceiver,@RabbitListenner(queuesToDeclare=@Queue("myQueue")),process()
4. 写一个发送方 用到了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());
}
}
什么情况下用Exchange?
- E.G. 订单可分为数码类订单和水果类订单,通过key的不同绑定myOrder消息队列。商场做大之后卖的比较多了,对多种商品可以下单。 订单,商家都有团队服务。 订单要根据不同的商品类型,发送不同消息。 这个时候要涉及到消息的分组,就是route的key就要产生变化了。exchanger不用变。 然后key就要变了。到了不同的消息队列也就是queue。