二、RabbitMQ入门案例

入门案例

1、增加仓库依赖

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

2、增加配置文件

  rabbitmq:
    host: 127.0.0.1
    port: 5672
    username: guest
    password: guest
    listener:
      simple:
        # 并发数
        concurrency: 5
        # 最大并发数
        max-concurrency: 10
        # 签收模式，auto自动签收，manual手动签收
        acknowledge-mode: manual
        # 限流 同一时间只能有一条消息过来
        prefetch: 1
    # 使confirmCallback回调生效
    publisher-confirm-type: correlated
    # 使returnsCallback回调生效
    publisher-returns: true
    # 如果配置为false，交换机没有匹配到队列就会丢弃掉消息，而不会触发returnCallback的回调
    template:
      mandatory: true

3、消费者代码

package com.strap.mydemo.components;

import lombok.extern.log4j.Log4j;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

/**
 * <p>消费者</p>
 *
 * @author strap
 */
@Component
@Log4j
public class MqConsumer {

    public MqConsumer() {
    }

    @RabbitListener(queues = "mq-queue")
    public void consume(String msg) {
        log.info("消费者已拿到消息：" + msg);
    }

}

4、生产者代码

package com.strap.mydemo.components;

import lombok.extern.log4j.Log4j;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * <p>生产者</p>
 *
 * @author strap
 */
@Component
@Log4j
public class MqProducer {

    private AmqpTemplate rabbitAmqpTemplate;

    @Autowired
    public MqProducer(AmqpTemplate rabbitAmqpTemplate) {
        this.rabbitAmqpTemplate = rabbitAmqpTemplate;
    }

    public void send(String msg){
        // 向消息队列发送消息
        // 参数1：队列名称， 参数2：消息
        rabbitAmqpTemplate.convertAndSend("mq-queue", msg);
        log.info("生产者已发送消息：" + msg);
    }

}

6、Demo

package com.strap.mydemo;

import com.strap.mydemo.components.MqProducer;
import lombok.extern.log4j.Log4j;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

/**
 * <p></p>
 *
 * @author strap
 */
@SpringBootTest(args = "--jasypt.encryptor.password=test123")
@Log4j
public class TestMQ {

    private MqProducer mqProducer;

    @Autowired
    public TestMQ(MqProducer mqProducer) {
        this.mqProducer = mqProducer;
    }

    @Test
    public void test1() {
        mqProducer.send("这是一条通知");
    }

}

结果