4.Rabbitmq Publish/Subscribe

前言

发布订阅模式，如下所示：
p: 生产者，生产消息；
x: 交换机，接收消息；
c1,c2: 消息队列

代码

• build.gradle

plugins {
    id 'java'}

group 'com.nick'version '1.0-SNAPSHOT'sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'com.rabbitmq', name: 'amqp-client', version: '5.2.0'
    compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
    compile group: 'org.projectlombok', name: 'lombok', version: '1.18.0'}

• EmitLog.java

package com.nick.publishSubscribe;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;import java.util.concurrent.TimeoutException;public class EmitLog {    private static final String EXCHANGE_NAME = "logs";    public static void main(String[] argv)
            throws java.io.IOException, TimeoutException {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.5.136");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");        //String message = getMessage(argv);
        String message = "hello publish and subscribe.";

        channel.basicPublish(EXCHANGE_NAME, "key_nick", null, message.getBytes());
        System.out.println(" [x] Sent '" + message + "'");

        channel.close();
        connection.close();
        System.exit(0);
    }
}

• ReceiveLogs.java

package com.nick.publishSubscribe;import com.rabbitmq.client.*;import java.io.IOException;public class ReceiveLogs {    private static final String EXCHANGE_NAME = "logs";    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.5.136");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
        String queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, EXCHANGE_NAME, "key_nick");

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

        Consumer consumer = new DefaultConsumer(channel) {            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                                       AMQP.BasicProperties properties, byte[] body) throws IOException {
                String message = new String(body, "UTF-8");
                System.out.println(" [x] Received '" + message + "'");
            }
        };
        channel.basicConsume(queueName, true, consumer);
    }
}

执行效果

• 执行ReceiveLogs，再执行EmitLog查看日志打印，可以看到接收到了数据

详细代码

详细代码可以在github上下载：https://github.com/qiujiahong/rabbitmq_study