ApsaraMQ for RabbitMQ:Step 3: Use SDKs to send and receive messages

Install Java dependency

1. Create a Java project in IntelliJ IDEA.

2. Add the following dependency to the pom.xml file to import the Java dependency library:

   <dependency>
       <groupId>com.rabbitmq</groupId>
       <artifactId>amqp-client</artifactId>
       <version>5.5.0</version> <!-- All versions of open source RabbitMQ are supported. -->
   </dependency>

Produce messages

In the Java project that you created, create a producer program, configure the relevant parameters based on the description in SDK parameters, and then run the program.

Sample code:

import com.rabbitmq.client.AMQP;
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.HashMap;
import java.util.UUID;
import java.util.concurrent.TimeoutException;

public class ProducerTest {
    public static void main(String[] args) throws IOException, TimeoutException {
        // The endpoint of the ApsaraMQ for RabbitMQ instance. 
        String hostName = "xxx.xxx.aliyuncs.com";
        // The static username and password of the ApsaraMQ for RabbitMQ instance. 
        String userName = "${UserName}";
        String passWord = "${PassWord}";
        // The vhost of the ApsaraMQ for RabbitMQ instance. 
        String virtualHost = "${VirtualHost}";

        // In production environments, we recommend that you create the connection in advance and reuse it when needed. This prevents frequent establishment and closing of connections and improves system performance and stability. 
        Connection connection = createConnection(hostName, userName, passWord, virtualHost);
        Channel channel = connection.createChannel();

        // The binding between the exchange and the queue. 
        String exchangeName = "${ExchangeName}";
        String queueName = "${QueueName}";
        String routingKey = "${RoutingKey}";
        // The exchange type. 
        String exchangeType = "${ExchangeType}";

        // To ensure user experience, make sure that the exchange and the queue are created by using a suitable method. 
        // In production environments, we recommend that you create the exchange and the queue in the ApsaraMQ for RabbitMQ console in advance. Do not declare the exchange or the queue in the code. Otherwise, throttling is triggered for the corresponding API operation. 
        channel.exchangeDeclare(exchangeName, exchangeType, true, false, false, null);
        channel.queueDeclare(queueName, true, false, false, new HashMap<String, Object>());
        channel.queueBind(queueName, exchangeName, routingKey);
        // Send a message. 
        for (int i = 0; i < 10; i++  ) {
            AMQP.BasicProperties props = new AMQP.BasicProperties.Builder().messageId(UUID.randomUUID().toString()).build();
            channel.basicPublish(exchangeName, routingKey, true, props,
                    ("Sample message body-" + i).getBytes(StandardCharsets.UTF_8));
            System.out.println("[SendResult] Message sent successfully, messageId: " + props.getMessageId() + ", exchange: " + exchangeName + ", routingKey: " + routingKey);
        }
        connection.close();
    }

    public static Connection createConnection(String hostName, String userName, String passWord, String virtualHost) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(hostName);
        factory.setUsername(userName);
        factory.setPassword(passWord);
        // Specify whether to enable automatic connection recovery. If you set this parameter to true, automatic connection recovery is enabled. If you set this parameter to false, automatic connection recovery is disabled. 
        factory.setAutomaticRecoveryEnabled(true);
        factory.setNetworkRecoveryInterval(5000);
        factory.setVirtualHost(virtualHost);
        // The default port. Port 5672 is used for non-encrypted connections. Port 5671 is used for encrypted connections. 
        factory.setPort(5672);
        // The timeout period. Configure this parameter based on the network environment. 
        factory.setConnectionTimeout(30 * 1000);
        factory.setHandshakeTimeout(30 * 1000);
        factory.setShutdownTimeout(0);
        Connection connection = factory.newConnection();
        return connection;
    }
}

Subscribe to messages

In the Java project that you created, create a consumer program, configure the relevant parameters based on the description in SDK parameters, and then run the program.

Sample code:

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

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

public class ConsumerTest {
    public static void main(String[] args) throws IOException, TimeoutException {
        // The endpoint of the ApsaraMQ for RabbitMQ instance. 
        String hostName = "xxx.xxx.aliyuncs.com";
        // The static username and password of the ApsaraMQ for RabbitMQ instance. 
        String userName = "${UserName}";
        String passWord = "${PassWord}";
        // The vhost of the ApsaraMQ for RabbitMQ instance. 
        String virtualHost = "${VirtualHost}";

        Connection connection = createConnection(hostName, userName, passWord, virtualHost);
        final Channel channel = connection.createChannel();

        // Declare the queue. 
        String queueName = "${QueueName}";
        // Create the ${QueueName} queue. Make sure that the queue exists in the ApsaraMQ for RabbitMQ console. 
        AMQP.Queue.DeclareOk queueDeclareOk = channel.queueDeclare(queueName, true, false, false, new HashMap<String, Object>());

        // Consume a message. 
        channel.basicConsume(queueName, false, "ConsumerTag", new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                                       AMQP.BasicProperties properties, byte[] body)
            throws IOException {
                // Process the received message based on the message consumption logic. 
                System.out.println("Received: "  + new String(body, StandardCharsets.UTF_8) +  ", deliveryTag: "  + envelope.getDeliveryTag()  + ", messageId: " +  properties.getMessageId());
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        });
    }

    public static Connection createConnection(String hostName, String userName, String passWord, String virtualHost) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(hostName);
        factory.setUsername(userName);
        factory.setPassword(passWord);
        // Specify whether to enable automatic connection recovery. If you set this parameter to true, automatic connection recovery is enabled. If you set this parameter to false, automatic connection recovery is disabled. 
        factory.setAutomaticRecoveryEnabled(true);
        factory.setNetworkRecoveryInterval(5000);
        factory.setVirtualHost(virtualHost);
        // The default port. Use port 5672 for non-encrypted connections and port 5671 for encrypted connections. 
        factory.setPort(5672);
        factory.setConnectionTimeout(300 * 1000);
        factory.setHandshakeTimeout(300 * 1000);
        factory.setShutdownTimeout(0);
        Connection connection = factory.newConnection();
        return connection;
    };
}

SDK parameters

References

• ApsaraMQ for RabbitMQ is fully compatible with open source RabbitMQ and supports open source RabbitMQ SDKs for multiple programming languages. For information about SDKs for other programming languages, see Programming languages and frameworks supported by open source RabbitMQ SDKs over AMQP. For information about other parameters, see Client Documentation.

• If errors occur during client running, you can troubleshoot the errors by referring to Error codes.