Spring Boot笔记-接收RabbitMQ队列中的消息

目录

基本概念

代码与实例

---

基本概念

首先有个关键：此处实验接收的数据类型为Order，这里要求发送和接收要一模一样。

包括包名和类名都要一模一样：

如下，consumerDemo

下面是productorDemo

这里，包名和类都一模一样否则接收端监听会失败！

在消费（接收订阅）端要配置一些数据：

spring.rabbitmq.listener.simple.concurrency=5
spring.rabbitmq.listener.simple.max-concurrency=10
spring.rabbitmq.listener.simple.acknowledge-mode=manual

这里指的是目前并发为5个，最大并发数为10个，监听确认为手动，也就是接收了数据，要给RabbitMQ给一个反馈信息

如下

这里有2个注解，是简单使用RabbitMQ的关键！

    @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "order-queue", durable = "true"),
            exchange = @Exchange(name = "order-exchange", type = "topic"),
            key = "order.#"))
    @RabbitHandler
    public void onOrderMessage(@Payload Order order,
                               @Headers Map headers,
                               Channel channel //手工签收需要rabbitMQ的通道
                               ) throws Exception{

            ....
            ....
            ....
}

这里如果没有对应的交换机和队列，那么此处就会自动新建

代码与实例

发送端不停的发送消息！接收端如下：

发送端关键代码：

OderSender.java

package SpringBoot.demo.produce;

import SpringBoot.demo.entity.Order;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class OderSender {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    public void send(Order order) throws Exception{

        CorrelationData correlationData = new CorrelationData();
        correlationData.setId(order.getMessageId());


        rabbitTemplate.convertAndSend("order-exchange",     //exchange
                "order.abcd",       //routingKey
                order,                          //消息体
                correlationData);               //correlationData消息唯一ID
    }
}

DemoApplicationTests.java

package SpringBoot.demo;

import SpringBoot.demo.entity.Order;
import SpringBoot.demo.produce.OderSender;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.UUID;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {


    @Autowired
    private OderSender oderSender;

    @Test
    public void contextLoads() {
    }

    @Test
    public void testSend1()throws Exception{

        Order order = new Order();
        order.setId("20180618000000000003");
        order.setName("测试订单3");
        order.setMessageId(System.currentTimeMillis() + "$" + UUID.randomUUID().toString());
        oderSender.send(order);
    }

}

application.properties

server.port=8001
spring.rabbitmq.addresses=192.168.164.141:5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
spring.rabbitmq.connection-timeout=15000


server.servlet.context-path=/
spring.http.encoding.charset=UTF-8
spring.jackson.data-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8
spring.jackson.default-property-inclusion=NON_NULL

接收端关键如下：

OrderReceiver.java

package SpringBoot.demo.consumer;

import SpringBoot.demo.entity.Order;
import com.rabbitmq.client.Channel;
import org.springframework.amqp.rabbit.annotation.*;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.messaging.handler.annotation.Headers;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;

import java.util.Map;

@Component
public class OrderReceiver {


    @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "order-queue", durable = "true"),
            exchange = @Exchange(name = "order-exchange", type = "topic"),
            key = "order.#"))
    @RabbitHandler
    public void onOrderMessage(@Payload Order order,
                               @Headers Map headers,
                               Channel channel //手工签收需要rabbitMQ的通道
                               ) throws Exception{

        //消费者操作
        System.out.println("--------------收到消息,开始消费--------------");
        System.out.println("订单ID：" + order.getId());


        //告诉RabbitMQ我已经签收了
        long deliveryTag = (long)headers.get(AmqpHeaders.DELIVERY_TAG);
        channel.basicAck(deliveryTag, false);   //false为不支持批量签收
    }


}

application.properties

server.port=8002
spring.rabbitmq.addresses=192.168.164.141:5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
spring.rabbitmq.connection-timeout=15000

server.servlet.context-path=/
spring.http.encoding.charset=UTF-8
spring.jackson.data-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8
spring.jackson.default-property-inclusion=NON_NULL


#配置关于consumer相关的
spring.rabbitmq.listener.simple.concurrency=5
spring.rabbitmq.listener.simple.max-concurrency=10
spring.rabbitmq.listener.simple.acknowledge-mode=manual

#限流，同一时间只有一条消息消费
spring.rabbitmq.listener.simple.prefetch=1      

源码下载地址：

https://github.com/fengfanchen/Java/tree/master/ProductorDemo

https://github.com/fengfanchen/Java/tree/master/consumerDemo