boot-主题模式

• topic 是RabbitMQ中最灵活的一种方式，可以根据routing_key自由的绑定不同的队列
  首先对topic规则配置，这里使用两个队列(消费者)来演示。
• 配置类

package com.zpc.rabbitmq.topic;

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 TopicRabbitConfig {

    final static String message = "q_topic_message";
    final static String messages = "q_topic_messages";

    @Bean
    public Queue queueMessage() {
        return new Queue(TopicRabbitConfig.message);
    }

    @Bean
    public Queue queueMessages() {
        return new Queue(TopicRabbitConfig.messages);
    }

    /**
     * 声明一个Topic类型的交换机
     * @return
     */
    @Bean
    TopicExchange exchange() {
        return new TopicExchange("mybootexchange");
    }

    /**
     * 绑定Q到交换机,并且指定routingKey
     * @param queueMessage
     * @param exchange
     * @return
     */
    @Bean
    Binding bindingExchangeMessage(Queue queueMessage, TopicExchange exchange) {
        return BindingBuilder.bind(queueMessage).to(exchange).with("topic.message");
    }

    @Bean
    Binding bindingExchangeMessages(Queue queueMessages, TopicExchange exchange) {
        return BindingBuilder.bind(queueMessages).to(exchange).with("topic.#");
    }
}

• 消费者1

package com.zpc.rabbitmq.topic;

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
@RabbitListener(queues = "q_topic_message")
public class Receiver1 {

    @RabbitHandler
    public void process(String hello) {
        System.out.println("Receiver1  : " + hello);
    }
}

• 消费者2

package com.zpc.rabbitmq.topic;

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
@RabbitListener(queues = "q_topic_messages")
public class Receiver2 {

    @RabbitHandler
    public void process(String hello) {
        System.out.println("Receiver2 : " + hello);
    }
}

• 生产者

package com.zpc.rabbitmq.topic;

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MsgSender {

    @Autowired
    private AmqpTemplate rabbitTemplate;

    public void send1() {
        String context = "hi, i am message 1";
        System.out.println("Sender : " + context);
        this.rabbitTemplate.convertAndSend("mybootexchange", "topic.message", context);
    }


    public void send2() {
        String context = "hi, i am messages 2";
        System.out.println("Sender : " + context);
        this.rabbitTemplate.convertAndSend("mybootexchange", "topic.messages", context);
    }
}

send1方法会匹配到topic.#和topic.message，两个Receiver都可以收到消息，发送send2只有topic.#可以匹配所以只有Receiver2监听到消息。

• 测试

package com.zpc.rabbitmq.topic;

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;

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

    @Autowired
    private MsgSender msgSender;

    @Test
    public void send1() throws Exception {
        msgSender.send1();
    }

    @Test
    public void send2() throws Exception {
        msgSender.send2();
    }
}