RabbitMQ 路由队列

应用场景：有些消费者能收，有些消费者不能收。

官网：https://www.rabbitmq.com/tutorials/tutorial-four-java.html

1.创建一个生产者 Send.java：

package com.ckfuture.direct.send;

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

import java.nio.charset.StandardCharsets;

/**
 * 路由队列-消息生产者
 */
public class Send {

    //定义交换机名称
    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] argv) throws Exception {
        //创建连接工厂
        ConnectionFactory factory = new ConnectionFactory();
        //连接工厂的地址
        factory.setHost("localhost");
        try (
                //连接工厂创建连接
                Connection connection = factory.newConnection();
                //创建信道
                Channel channel = connection.createChannel()) {
                //绑定交换机
                channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
                String infoMessage = "普通信息！";
                String errorMessage = "错误信息!";
                String warningMessage = "警告信息!";
                //路由key
                String infoRoutingKey="info";
                String errorRoutingKey="error";
                String warningRoutingKey="warning";

                //发送消息
                channel.basicPublish(EXCHANGE_NAME, infoRoutingKey, null, infoMessage.getBytes(StandardCharsets.UTF_8));
                channel.basicPublish(EXCHANGE_NAME, errorRoutingKey, null, errorMessage.getBytes(StandardCharsets.UTF_8));
                channel.basicPublish(EXCHANGE_NAME, warningRoutingKey, null, warningMessage.getBytes(StandardCharsets.UTF_8));
                System.out.println(" [x] Sent '" + infoMessage + "'");
                System.out.println(" [x] Sent '" + errorMessage + "'");
                System.out.println(" [x] Sent '" + warningMessage + "'");

        }
    }
}

2.创建第一个消费者Recv01.java：

第一个消费者只能接收 error消息

package com.ckfuture.direct.recv;

import com.rabbitmq.client.*;

/**
 * 路由队列-消息消费者
 */
public class Recv01 {

    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] argv) throws Exception {
        //创建连接工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        //连接工厂创建连接
        Connection connection = factory.newConnection();
        //创建信道
        Channel channel = connection.createChannel();

        //绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        //获取队列（排他队列）
        String queueName = channel.queueDeclare().getQueue();
        //绑定队列和交换机
        String errorRoutingKey="error";
        channel.queueBind(queueName,EXCHANGE_NAME,errorRoutingKey);

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {

            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");

        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });
    }
}

3.创建第二个消费者Recv.java

第二个消费者可以获取三个消息（error、info、warning）

package com.ckfuture.direct.recv;

import com.rabbitmq.client.*;

/**
 * 路由队列-消息消费者
 */
public class Recv02 {

    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] argv) throws Exception {
        //创建连接工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        //连接工厂创建连接
        Connection connection = factory.newConnection();
        //创建信道
        Channel channel = connection.createChannel();

        //绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        //获取队列（排他队列）
        String queueName = channel.queueDeclare().getQueue();
        //绑定队列和交换机
        String infoRoutingKey="info";
        String errorRoutingKey="error";
        String warningRoutingKey="warning";
        channel.queueBind(queueName,EXCHANGE_NAME,infoRoutingKey);
        channel.queueBind(queueName,EXCHANGE_NAME,errorRoutingKey);
        channel.queueBind(queueName,EXCHANGE_NAME,warningRoutingKey);

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });
    }
}