rabbitMQ发送消息端关键代码

package com.tszr;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.tszr.entity.Weather;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageBuilder;
import org.springframework.amqp.core.MessageDeliveryMode;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application implements CommandLineRunner {
    @Autowired
    private ObjectMapper objectMapper;

    @Autowired
    RabbitTemplate rabbitTemplate;

    public static void main(String[] args){
        SpringApplication.run(Application.class,args);
    }

    /**
     * 定义发布者
     */
    @Override
    public void run(String... args) throws Exception {
        //定义消息对象
        Weather weather = new Weather();
        weather.setId("010");
        weather.setCity("北京");
        weather.setWeatherDetail("今天晴到多云，南风5-6级，温度19-26°C");

        //指定Json转换器，Jackson2JsonMessageConverter默认将消息转换成byte[]类型的消息
        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter());
        //objectMapper将weather对象转换为JSON字节数组
        Message msg= MessageBuilder.withBody(objectMapper.writeValueAsBytes(weather))
                .setDeliveryMode(MessageDeliveryMode.NON_PERSISTENT)
                .build();
        // 消息唯一ID
        CorrelationData correlationData = new CorrelationData(weather.getId());
        //使用已封装好的convertAndSend(String exchange , String routingKey , Object message, CorrelationData correlationData)
        //将特定的路由key发送消息到指定的交换机
        rabbitTemplate.convertAndSend(
                "weather-exchange", //分发消息的交换机名称
                "weather.message", //用来匹配消息的路由Key
                msg, //消息体
                correlationData);
    }
}