springBoot集成rabbitmq 之主题模式(topics)

Posted 2023-03-03 普通成员-铷弟

springBoot集成rabbitmq 之主题模式(topics)

springBoot整合rabbitmq的例子: https://blog.csdn.net/weixin_45730866/article/details/128971917，建议先看。


consumer服务


配置类

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class RabbitTopicConfig  
    /**
     * Queue 可以有4个参数
     *      1.name          队列名
     *      2.durable       持久化消息队列 ,rabbitmq重启的时候不需要创建新的队列 默认true
     *      3.auto-delete   表示消息队列没有在使用时将被自动删除 默认是false
     *      4.exclusive     表示该消息队列是否只在当前connection生效,默认是false
     */
    @Bean
    public Queue createTopicQueueA() 
        return new Queue("QueueTopicA",true);
    
    @Bean
    public Queue createTopicQueueB() 
        return new Queue("QueueTopicB",true);
    

    @Bean
    public TopicExchange topicExchange() 
        //配置广播路由器
        return new TopicExchange("ExchangeTopic"); 
     
    //*（星号）：可以（只能）匹配一个单词
    //#（井号）：可以匹配多个单词（或者零个）
    @Bean
    public Binding bingQueueAToTopicExchange() 
        return BindingBuilder.bind(createTopicQueueA()).to(topicExchange()).with("topic.*");
     
    @Bean
    public Binding bingQueueBToTopicExchange() 
        return BindingBuilder.bind(createTopicQueueB()).to(topicExchange()).with("topic.#");
    

接收者A B

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component; 
import java.util.Date; 
@Component
@RabbitListener(queues = "QueueTopicA")
public class TopicReceiverA 
    @RabbitHandler
    public void process(String message) 
        System.out.println("接受者A : " + message +","+ new Date());
    

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component; 
import java.util.Date; 
@Component
@RabbitListener(queues = "QueueTopicB")
public class TopicReceiverB 
    @RabbitHandler
    public void process(String message) 
        System.out.println("接受者B : " + message +","+ new Date());
    

producer服务


发送者

import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component; 
import java.util.Date;
 
@Component
public class TopicSender 

	@Autowired
	private RabbitTemplate rabbitTemplate;

	public void send(int i) 
		String contentA = "主题交换机  A="+ i+"," + new Date() ;
		//消息发送，使用void convertAndSend(String exchange, String routingKey, Object message) throws AmqpException;
		//但不指定routingKey。因为FanoutExchange类型的交换机，routingKey不起作用，它向所有的队列发送广播，只要队列绑定到该交换机即接受消息。
		rabbitTemplate.convertAndSend("Exchange_Topic","topic.n",contentA);
		System.out.println("发送成功,"+new Date()+","+contentA);

		String contentB = "主题交换机  B="+ i+"," + new Date()  ;
		//消息发送，使用void convertAndSend(String exchange, String routingKey, Object message) throws AmqpException;
		//但不指定routingKey。因为FanoutExchange类型的交换机，routingKey不起作用，它向所有的队列发送广播，只要队列绑定到该交换机即接受消息。
		rabbitTemplate.convertAndSend("Exchange_Topic","topic.n.n",contentB);
		System.out.println("发送成功,"+new Date()+","+contentB);
	

测试

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; 
@RestController
@RequestMapping
public class TopicTestController 
    @Autowired
    private TopicSender topicSender; 
    @GetMapping("topic")
    public String topic()  
        topicSender.send(9999);
        return "topicOk";
    

请求http://127.0.0.1:8080/topic，

producer控制台输出

发送成功,Mon Feb 13 11:46:20 CST 2023,主题交换机  A=9999,Mon Feb 13 11:46:20 CST 2023
发送成功,Mon Feb 13 11:46:20 CST 2023,主题交换机  B=9999,Mon Feb 13 11:46:20 CST 2023 

consumer控制台输出

接受者B : 主题交换机  A=9999,Mon Feb 13 11:46:20 CST 2023,Mon Feb 13 11:46:20 CST 2023
接受者A : 主题交换机  A=9999,Mon Feb 13 11:46:20 CST 2023,Mon Feb 13 11:46:20 CST 2023
接受者B : 主题交换机  B=9999,Mon Feb 13 11:46:20 CST 2023,Mon Feb 13 11:46:20 CST 2023

生产者共计生产了 2 个消息，其它一条消息被消费者 A、 B 各消费了一次，另一条消息被消费者 B 消费了一次。