Accessing RabbitMQ on a Client (SSL Disabled)

Prerequisites

• A RabbitMQ instance with SSL disabled has been created following the instructions in Buying a RabbitMQ Instance. The username and password entered in the instance creation have been obtained.
• Instance Address (Private Network) or Instance Address (Public Network) has been recorded.
• The network between the client server and the RabbitMQ instance has been established. For details about network requirements, see RabbitMQ Network Connection Requirements.
• JDK v1.8.111 or later has been installed on the client server, and the JAVA_HOME and PATH environment variables have been configured as follows:

  Add the following lines to the .bash_profile file in the home directory as an authorized user. In this command, /opt/java/jdk1.8.0_151 is the JDK installation path. Change it to the path where you install JDK.

  export JAVA_HOME=/opt/java/jdk1.8.0_151 
  export PATH=$JAVA_HOME/bin:$PATH

  Run the source .bash_profile command for the modification to take effect.

• In the RabbitMQ instance: A virtual host, exchange, and queue have been created and an exchange-queue binding has been configured.

Accessing the Instance in CLI Mode

1. Log in to the client server.
2. Run the following command to download RabbitMQ-Tutorial.zip (code package of the sample project):

   wget https://dms-demo.obs.cn-north-1.myhuaweicloud.com/RabbitMQ-Tutorial.zip

3. Run the following command to decompress RabbitMQ-Tutorial.zip:

   unzip RabbitMQ-Tutorial.zip

4. Run the following command to navigate to the RabbitMQ-Tutorial directory, which contains the precompiled JAR file:

   cd RabbitMQ-Tutorial

5. Create messages using the sample project.

   java -cp .:rabbitmq-tutorial.jar Send {host} {port} {user} {password}

   Parameter description:

   • {host}: connection address obtained in Prerequisites
   • {port}: port of the RabbitMQ instance. Enter 5672.
   • {user}: username obtained in Prerequisites
   • {password}: password obtained in Prerequisites

   Sample message production:

   [root@ecs-test RabbitMQ-Tutorial]# java -cp .:rabbitmq-tutorial.jar Send 192.168.xx.40 5672 test Zxxxxxxs
    [x] Sent 'Hello World!'
   [root@ecs-test RabbitMQ-Tutorial]# java -cp .:rabbitmq-tutorial.jar Send 192.168.xx.40 5672 test Zxxxxxxs
    [x] Sent 'Hello World!'

6. Retrieve messages using the sample project.

   java -cp .:rabbitmq-tutorial.jar Recv {host} {port} {user} {password}

   Parameter description:

   • {host}: connection address obtained in Prerequisites
   • {port}: port of the RabbitMQ instance. Enter 5672.
   • {user}: username obtained in Prerequisites
   • {password}: password obtained in Prerequisites

   Sample message consumption:

   [root@ecs-test RabbitMQ-Tutorial]# java -cp .:rabbitmq-tutorial.jar Recv 192.168.xx.40 5672 test Zxxxxxxs
    [*] Waiting for messages. To exit press CTRL+C
    [x] Received 'Hello World!'
    [x] Received 'Hello World!'

   To stop retrieving messages, press Ctrl+C to exit.

Java Sample Code

• Accessing an instance and producing messages
  • VHOST_NAME: name of the virtual host that contains the queue for messages to be sent to
  • QUEUE_NAME: name of the queue for messages to be sent to
  • Hello World!: the message to be sent in this sample

  ConnectionFactory factory = new ConnectionFactory();
   factory.setHost(host);
   factory.setPort(port);
   factory.setVirtualHost("VHOST_NAME");
  
   factory.setUsername(user);
   factory.setPassword(password);
   Connection connection = factory.newConnection();
   Channel channel = connection.createChannel();
  
   channel.queueDeclare(QUEUE_NAME, false, false, false, null);
  
   String message = "Hello World!";
   channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
   System.out.println(" [x] Sent '" + message + "'");
  
   channel.close();
   connection.close();

• Accessing an instance and consuming messages
  • VHOST_NAME: name of the virtual host that contains the queue to consume messages
  • QUEUE_NAME: name of the queue to consume messages

  ConnectionFactory factory = new ConnectionFactory();
   factory.setHost(host);
   factory.setPort(port);
   factory.setVirtualHost("VHOST_NAME");
   factory.setUsername(user);
   factory.setPassword(password);
   Connection connection = factory.newConnection();
   Channel channel = connection.createChannel();
  
   channel.queueDeclare(QUEUE_NAME, false, false, false, null);
   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(QUEUE_NAME, true, consumer);