Topics（主题），基于模式的接收消息

生产者

package org.example.topic;

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

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.LinkedHashMap;
import java.util.Map;

public class EmitLogTopic {
    private static final String EXCHANGE_NAME = "topic_logs";
    public static void main(String[] argv)  throws Exception {
        Map<String, String> area = new LinkedHashMap<>();
        area.put("china.hebei.shijiazhuang.20991011", "中国河北石家庄20991011天气数据");
        area.put("china.shandong.qingdao.20991011", "中国山东青岛20991011天气数据");
        area.put("china.henan.zhengzhou.20991011", "中国河南郑州20991011天气数据");
        area.put("us.cal.la.20991011", "美国加州洛杉矶20991011天气数据");

        area.put("china.hebei.shijiazhuang.20991012", "中国河北石家庄20991012天气数据");
        area.put("china.shandong.qingdao.20991012", "中国山东青岛20991012天气数据");
        area.put("china.henan.zhengzhou.20991012", "中国河南郑州20991012天气数据");
        area.put("us.cal.la.20991012", "美国加州洛杉矶20991012天气数据");

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.121.200");
        try (Connection connection = factory.newConnection();
             Channel channel = connection.createChannel()) {

            channel.exchangeDeclare(EXCHANGE_NAME, "topic");

            area.forEach((k,v)->{
                try {
                    channel.basicPublish(EXCHANGE_NAME, k, null, v.getBytes(StandardCharsets.UTF_8));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
                System.out.println(" [x] Sent '" + k + "':'" + v + "'");
            });


        }
    }
}

消费者

package org.example.topic;

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

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeoutException;

public class ReceiveLogsTopic {
    private static final String EXCHANGE_NAME = "topic_logs";

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

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

        System.err.println("Usage: ReceiveLogsTopic [binding_key]...");
        channel.queueBind(queueName, EXCHANGE_NAME, "us.#.20991011");

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