Routing（路由），有选择地接收消息

生产者

package org.example.routing;

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

import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;

public class EmitLogDirect {
    private static final String EXCHANGE_NAME = "direct_logs";
    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.121.200");
        try (Connection connection = factory.newConnection();
             Channel channel = connection.createChannel()) {
            channel.exchangeDeclare(EXCHANGE_NAME, "direct");

            List<String> severityList = Arrays.asList("error","info","warning");
            for (String severity : severityList) {
                channel.basicPublish(EXCHANGE_NAME, severity, null, (severity+"消息").getBytes(StandardCharsets.UTF_8));
                System.out.println(" [x] Sent '" + severity + "':'" + (severity+"消息") + "'");
            }
        }
    }
}

消费者1

package org.example.routing;

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

import java.nio.charset.StandardCharsets;

public class ReceiveLogsDirect1 {
    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.121.200");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "direct");
        String queueName = channel.queueDeclare().getQueue();

        channel.queueBind(queueName, EXCHANGE_NAME, "error");

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

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
            System.out.println(" [error] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}

消费者2

package org.example.routing;

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

import java.nio.charset.StandardCharsets;

public class ReceiveLogsDirect2 {
    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.121.200");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "direct");
        String queueName = channel.queueDeclare().getQueue();


        channel.queueBind(queueName, EXCHANGE_NAME, "info");

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

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
            System.out.println(" [info] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}

消费者3

package org.example.routing;

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

import java.nio.charset.StandardCharsets;

public class ReceiveLogsDirect3 {
    private static final String EXCHANGE_NAME = "direct_logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.121.200");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "direct");
        String queueName = channel.queueDeclare().getQueue();


        channel.queueBind(queueName, EXCHANGE_NAME, "error");
        channel.queueBind(queueName, EXCHANGE_NAME, "info");
        channel.queueBind(queueName, EXCHANGE_NAME, "warning");

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

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
            System.out.println(" [all] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}