mqtt模式--Direct 模式

Direct 模式是在 Fanout 模式基础上添加了 routing key，Fanout（发布/订阅）模式是交换机将消息存储到所有绑定的队列中，而 Direct 模式是在此基础上，添加了过滤条件，交换机只会将消息存储到满足 routing key 的队列中。

package com.tszr.direct;

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 = "direct_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 direct mode";
            // 指定路由key
            String routeKey = "email";
            String type = "direct";
            // 3、声明交换机
            channel.exchangeDeclare(EXCHANGE_NAME, type);
            // 4、声明队列
            channel.queueDeclare("queue1", false, false, false, null);
            channel.queueDeclare("queue2", false, false, false, null);
            channel.queueDeclare("queue3", false, false, false, null);
            // 5、绑定 channel 与 queue
            channel.queueBind("queue1", EXCHANGE_NAME, "email");
            channel.queueBind("queue2", EXCHANGE_NAME, "sms");
            channel.queueBind("queue3", EXCHANGE_NAME, "vx");
            // 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.direct;

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, "queue1").start(); new Thread(runnable, "queue2").start(); new Thread(runnable, "queue3").start(); } }