RabbitMQ - Subscriber Application

Now let's create a subscriber application which will receive message from the RabbitMQ Topic.

Create Project

Using eclipse, select FileNew Maven Project. Tick the Create a simple project(skip archetype selection) and click Next.

Enter the details, as shown below −

  • groupId − com.tutorialspoint

  • artifactId − subscriber

  • version − 0.0.1-SNAPSHOT

  • name − RabbitMQ Subscriber

Click on Finish button and a new project will be created.


Now update the content of pom.xml to include dependencies for RabbitMQ.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <name>RabbitMQ Subscriber</name>

Now create a Subscriber class which will receive message from the RabbitMQ Queue.

package com.tutorialspoint.rabbitmq;

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

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

public class Subscriber {
   private static String EXCHANGE = "MyExchange";
   public static void main(String[] args) throws IOException, TimeoutException {
      ConnectionFactory factory = new ConnectionFactory();
      Connection connection = factory.newConnection();
      Channel channel = connection.createChannel();
      channel.exchangeDeclare(EXCHANGE, "fanout");

      String queueName = channel.queueDeclare().getQueue();
      channel.queueBind(queueName, EXCHANGE, "");
      System.out.println("Waiting for messages. To exit press CTRL+C");

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

Subscriber class creates a connection, creates a channel, declares the exchange, create a random queue and binds it with the exchange and then receives message from topic if there is any. Press Ctrl + C to terminate else it will keep polling queue for messages.

We'll run this application multiple times to create multiple subscribers in RabbitMQ - Test Application chapter.