mqtt模式Topic 模式

Topic 模式是生产者通过交换机将消息存储到队列后，交换机根据绑定队列的 routing key 的值进行通配符匹配，如果匹配通过，消息将被存储到该队列，如果 routing key 的值匹配到了多个队列，消息将会被发送到多个队列；如果一个队列也没匹配上，该消息将丢失。

routing_key 必须是单词列表，用点分隔，其中 * 和 # 的含义为：

*：1个单词
#：0个或多个单词

package com.tszr.topic;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class Productor {
    private static final String EXCHANGE_NAME = "topic_exchange";

    public static void main(String[] args) {
        // 1、创建连接工程
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setUsername("guest");
        factory.setPassword("guest");
        factory.setVirtualHost("/");

        Connection connection = null;
        Channel channel = null;
        try {
            // 2、获取连接、通道
            connection = factory.newConnection();
            channel = connection.createChannel();
            // 消息内容
            String message = "hello topic mode";
            // 指定路由key
            String routeKey = "com.order.test.xxx";
            String type = "topic";
            // 3、声明交换机
            channel.exchangeDeclare(EXCHANGE_NAME, type);
            // 4、声明队列
            channel.queueDeclare("queue5",false,false,false,null);
            channel.queueDeclare("queue6",false,false,false,null);
            // 5、绑定 channel 与 queue
            channel.queueBind("queue5", EXCHANGE_NAME, "*.order.#");
            channel.queueBind("queue6", EXCHANGE_NAME, "#.test.*");
            // 6、发布消息
            channel.basicPublish(EXCHANGE_NAME, routeKey, null, message.getBytes("UTF-8"));
            System.out.println("消息发送成功!");
        } catch (IOException | TimeoutException e) {
            e.printStackTrace();
            System.out.println("消息发送异常");
        } finally {
            // 关闭通道
            if (channel != null && channel.isOpen()) {
                try {
                    channel.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            // 关闭连接
            if (connection != null && connection.isOpen()) {
                try {
                    connection.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

package com.tszr.topic;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class Customer {
    private static Runnable runnable = new Runnable() {
        @Override
        public void run() {
            // 创建连接工厂
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost("127.0.0.1");
            factory.setUsername("guest");
            factory.setPassword("guest");
            factory.setVirtualHost("/");

            final String queueName = Thread.currentThread().getName();
            Connection connection = null;
            Channel channel = null;
            try {
                // 获取连接、通道
                connection = factory.newConnection();
                channel = connection.createChannel();

                Channel finalChannel = channel;
                finalChannel.basicConsume(queueName, true, new DeliverCallback() {
                    @Override
                    public void handle(String consumerTag, Delivery delivery) throws IOException {
                        System.out.println(delivery.getEnvelope().getDeliveryTag());
                        System.out.println(queueName + ":收到消息是：" + new String(delivery.getBody(), "UTF-8"));
                    }
                }, new CancelCallback() {
                    @Override
                    public void handle(String consumerTag) throws IOException {
                    }
                });
                System.out.println(queueName + ":开始接收消息");
            } catch (IOException |
                    TimeoutException e) {
                e.printStackTrace();
            } finally {
                try {
                    Thread.sleep(3);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                // 关闭通道
                if (channel != null && channel.isOpen()) {
                    try {
                        channel.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                // 关闭连接
                if (connection != null && connection.isOpen()) {
                    try {
                        connection.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    };

    public static void main(String[] args) throws IOException, TimeoutException {
        // 创建线程分别从3个队列中获取消息
        new Thread(runnable, "queue5").start();
        new Thread(runnable, "queue6").start();
    }
}