RabbitMQ 消息转换器

 代码示例：

1. 引入依赖

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

2. 在启动类中创建Bean

package com.itheima;

import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class ErpApplication {

    public static void main(String[] args) {
        SpringApplication.run(ErpApplication.class, args);
    }
    
    @Bean
    public MessageConverter jacksonMessageConvertor() {
        return new Jackson2JsonMessageConverter();
    }

}

3. 测试：发送者发送消息给队列

@GetMapping("/mq05")
public void mq05(){
    String queueName = "object.queue";
    Map<String, Object> msg = new HashMap<>();
    msg.put("name", "jack");
    msg.put("age", 21);
    rabbitTemplate.convertAndSend(queueName, msg);//队列名称、要发送的消息
}

对比：下面的是加了消息转换器的，上面的是没加的时候的

5. 消费者从队列中接收消息（跟之前一样）

@RabbitListener(queues = "object.queue")
public void listenQueue07(Map<String, Object> msg) {
    System.out.println("消费者收到了object.queue的消息:" + msg);
}