RabbitMQ Publish/Subscribe

消息生产者

package com.gch.rabbit.publish;

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

public class EmitLog {

    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] argv) throws Exception {

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

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");//信道设置一个交换器，并设置交换规则
        //因为设置的交换器交换规则为分发，所以所有的队列都能接收到消息，所以此处不用声明队列

        //分发消息
        for(int i = 0 ; i < 5; i++){
            String message = "Hello World! " + i;
            channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes());//把消息发送给交换器
            System.out.println("发送消息：" + message);
        }
        channel.close();
        connection.close();
    }
}

1号消息接收者

package com.gch.rabbit.publish;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import java.io.IOException;

public class ReceiveLogs1 {

    private static final String EXCHANGE_NAME = "logs";

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

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");

        String queueName = channel.queueDeclare().getQueue();//声明一个临时队列，用于接收消息

        channel.queueBind(queueName, EXCHANGE_NAME, "");//将临时队列和交换器绑定

        System.out.println("1号临时队列正在等待消息...");

        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("1号临时队列接收到消息：" + message);
            }
        };
        channel.basicConsume(queueName, true, consumer);
    }

}

2号消息接收者

package com.gch.rabbit.publish;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import java.io.IOException;

public class ReceiveLogs2 {

    private static final String EXCHANGE_NAME = "logs";

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

        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");

        String queueName = channel.queueDeclare().getQueue();//声明一个临时队列，用于接收消息

        channel.queueBind(queueName, EXCHANGE_NAME, "");//将临时队列和交换器绑定

        System.out.println("2号临时队列正在等待消息...");

        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("2号临时队列接收到消息：" + message);
            }
        };
        channel.basicConsume(queueName, true, consumer);
    }

}