RabbitMQ交换机topic主题模式

交换机topic主题模式

Topic交换机相对于direct交换机更加灵活。
direct交换机只能指定具有相同routingkey的队列,类似于sql的精确查询。
而Topic交换则更像是Like语句，用来模糊匹配routingkey
topic指定routingkey时用".“分隔词语，例如：order.test.key，可以任意用”."分隔多个词，但是最长不能超过255个字节。

匹配规则

*(星号)可以代替一个单词
#(井号)可以替代零个或多个单词

生产者产生多条消息和不同的路由规则

public class TopicExchange {

    public static final String EXCHANGE_NAME = "topic_exchange_test";

    public static void main(String[] args) {
        try {
            Channel channel = RabbitMqUtils.getChannel();
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);

            Map<String,String> mapMessage = new HashMap<>();
            mapMessage.put("order.jack.wade","向order消息");
            mapMessage.put("order.jack.yiyi","向order消息");
            mapMessage.put("order.jack.huang.yi","接收不到的消息");
            mapMessage.put("warehouse.jack.huang","向warehouse发送消息");
            mapMessage.put("warehouse.chen.op","向warehouse发送消息");
            mapMessage.put("jackwade.self.nm","向jackwade发送消息");
            mapMessage.put("jackwade.self.wade.loop","向jackwade发送消息");
            mapMessage.put("jackwade.two.wade.mq.rabbit","向jackwade发送消息");
            mapMessage.put("oop.self.nm","向oop.self发送消息");
            mapMessage.put("oop.self.wade.loop","向oop.self发送消息");

            for(Map.Entry<String,String> message : mapMessage.entrySet()){
                //1.交换机名称  2.routingKey 3.其他属性 例如持久化,4.消息
                channel.basicPublish(EXCHANGE_NAME,message.getKey(),null,message.getKey().getBytes(StandardCharsets.UTF_8));
                System.out.println("生产者发出消息:"+message.getValue());
            }

        } catch (IOException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        }
    }

}

创建消费者

public class TopicExchangeConsumer1 {
    //交换机名称
    public static final String EXCHANGE_NAME = "topic_exchange_test";
    public static final String QUEUE_NAME = "order_queue";
    //匹配order开头的routingkey 长度是3个单词
    public static final String ROUTING_KEY = "order.*.*";

    public static void main(String[] args) throws IOException, TimeoutException {
        Channel channel = RabbitMqUtils.getChannel();
        /**
         * 1.交换机名称
         * 2.交换机类型
         */
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);

        //声明一个队列
        channel.queueDeclare(QUEUE_NAME,true,false,true,null);
        channel.queueBind(QUEUE_NAME,EXCHANGE_NAME,ROUTING_KEY);
        System.out.println(ROUTING_KEY+":消费者等待接收消息!");


        //接收消息回调
        DeliverCallback callback = (consumerTag, message) -> {
            String receiveMessage = new String(message.getBody(), Charsets.UTF_8.name());
            System.out.println(ROUTING_KEY+"_接收到消息:"+receiveMessage+" 标签："+consumerTag);
        };
        //取消消息回调
        CancelCallback cancelCallback = consumerTag -> {
            System.out.println(ROUTING_KEY+"_消费者取消消费接口回调逻辑:"+consumerTag);
        };
        channel.basicConsume(QUEUE_NAME,false,callback,cancelCallback);
    }

}

消费者2

public class TopicConsumer2 {

    //交换机名称
    public static final String EXCHANGE_NAME = "topic_exchange_test";
    public static final String QUEUE_NAME = "order_queue";
    //匹配order开头的routingkey 长度是3个单词
    public static final String ROUTING_KEY = "warehouse.*.*";

    public static void main(String[] args) throws IOException, TimeoutException {
        Channel channel = RabbitConnectUtils.getChanel();
        /**
         * 1.交换机名称
         * 2.交换机类型
         */
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);

        //声明一个队列
        channel.queueDeclare(QUEUE_NAME,true,false,true,null);
        channel.queueBind(QUEUE_NAME,EXCHANGE_NAME,ROUTING_KEY);
        System.out.println(ROUTING_KEY+":消费者等待接收消息!");


        //接收消息回调
        DeliverCallback callback = (consumerTag, message) -> {
            String receiveMessage = new String(message.getBody(), Charsets.UTF_8.name());
            System.out.println(ROUTING_KEY+"_接收到消息:"+receiveMessage+" 标签："+consumerTag);
        };
        //取消消息回调
        CancelCallback cancelCallback = consumerTag -> {
            System.out.println(ROUTING_KEY+"_消费者取消消费接口回调逻辑:"+consumerTag);
        };
        channel.basicConsume(QUEUE_NAME,false,callback,cancelCallback);
    }

}

消费者1匹配order开头并且是三个单词的routingke

public static final String ROUTING_KEY = "order.*.*";

输出

消费者2的routingkey 匹配以warehouse开头并且是三个单词的routingkey

public static final String ROUTING_KEY = "warehouse.*.*";

输出
入图片描述

消费者3的routingkey 匹配中间且是三个组成的单词

public static final String ROUTING_KEY = "*.self.*";

输出

消费者4的routingkey 匹配以jackwade开头的routingkey后面的单词长度不限

 public static final String ROUTING_KEY = "jackwade.#";