Esempi di utilizzo di Java Message Service (JMS) con ActiveMQ

Aggiungere i pacchetti activemq-client.jar e activemq-pool.jar al percorso di classe Java. L'esempio seguente mostra queste dipendenze in un file pom.xml di progetto Maven.

<dependencies>
    <dependency>
        <groupId>org.apache.activemq</groupId>
        <artifactId>activemq-client</artifactId>
        <version>5.15.16</version>
    </dependency>
    <dependency>
        <groupId>org.apache.activemq</groupId>
        <artifactId>activemq-pool</artifactId>
        <version>5.15.16</version>
    </dependency>
</dependencies>

Per ulteriori informazioni su activemq-client.jar, consultare Configurazione iniziale nella documentazione di Apache ActiveMQ.

Aggiungi il pacchetto org.eclipse.paho.client.mqttv3.jar al percorso di classe Java. L'esempio seguente mostra questa dipendenza in un file pom.xml di progetto Maven.

<dependencies>
                    <dependency>
                        <groupId>org.eclipse.paho</groupId>
                        <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
                        <version>1.2.0</version>
                    </dependency>                               
                    </dependencies>

Per ulteriori informazioni su org.eclipse.paho.client.mqttv3.jar, consulta Eclipse Paho Java Client.

Aggiungi i pacchetti seguenti al percorso di classe Java:

L'esempio seguente mostra queste dipendenze in un file pom.xml di progetto Maven.

<dependencies>
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring-messaging</artifactId>
                        <version>5.0.5.RELEASE</version>
                    </dependency>
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>spring-websocket</artifactId>
                        <version>5.0.5.RELEASE</version>
                    </dependency>
                    <dependency>
                        <groupId>javax.websocket</groupId>
                        <artifactId>javax.websocket-api</artifactId>
                        <version>1.1</version>
                    </dependency>
                    <dependency>
                        <groupId>org.eclipse.jetty.aggregate</groupId>
                        <artifactId>jetty-all</artifactId>
                        <type>pom</type>
                        <version>9.3.3.v20150827</version>
                    </dependency>
                    <dependency>
                        <groupId>org.slf4j</groupId>
                        <artifactId>slf4j-simple</artifactId>
                        <version>1.6.6</version>
                    </dependency>
                    <dependency>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-databind</artifactId>
                        <version>2.5.0</version>
                    </dependency>
                    </dependencies>

Per ulteriori informazioni, vedere STOMPSupport nella documentazione di Spring Framework.

/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  https://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */
                    
                    import org.apache.activemq.ActiveMQConnectionFactory;
                    import org.apache.activemq.jms.pool.PooledConnectionFactory;
                    
                    import javax.jms.*;
                    
                    public class AmazonMQExample {
                    
                    // Specify the connection parameters.
                    private final static String WIRE_LEVEL_ENDPOINT 
                            = "ssl://b-1234a5b6-78cd-901e-2fgh-3i45j6k178l9-1.mq.us-east-2.amazonaws.com:61617";
                    private final static String ACTIVE_MQ_USERNAME = "MyUsername123";
                    private final static String ACTIVE_MQ_PASSWORD = "MyPassword456";
                    
                    public static void main(String[] args) throws JMSException {
                        final ActiveMQConnectionFactory connectionFactory =
                                createActiveMQConnectionFactory();
                        final PooledConnectionFactory pooledConnectionFactory =
                                createPooledConnectionFactory(connectionFactory);
                    
                        sendMessage(pooledConnectionFactory);
                        receiveMessage(connectionFactory);
                    
                        pooledConnectionFactory.stop();
                    }
                    
                    private static void
                    sendMessage(PooledConnectionFactory pooledConnectionFactory) throws JMSException {
                        // Establish a connection for the producer.
                        final Connection producerConnection = pooledConnectionFactory
                                .createConnection();
                        producerConnection.start();
                    
                        // Create a session.
                        final Session producerSession = producerConnection
                                .createSession(false, Session.AUTO_ACKNOWLEDGE);
                    
                        // Create a queue named "MyQueue".
                        final Destination producerDestination = producerSession
                                .createQueue("MyQueue");
                    
                        // Create a producer from the session to the queue.
                        final MessageProducer producer = producerSession
                                .createProducer(producerDestination);
                        producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
                    
                        // Create a message.
                        final String text = "Hello from Amazon MQ!";
                        final TextMessage producerMessage = producerSession
                                .createTextMessage(text);
                    
                        // Send the message.
                        producer.send(producerMessage);
                        System.out.println("Message sent.");
                    
                        // Clean up the producer.
                        producer.close();
                        producerSession.close();
                        producerConnection.close();
                    }
                    
                    private static void
                    receiveMessage(ActiveMQConnectionFactory connectionFactory) throws JMSException {
                        // Establish a connection for the consumer.
                        // Note: Consumers should not use PooledConnectionFactory.
                        final Connection consumerConnection = connectionFactory.createConnection();
                        consumerConnection.start();
                    
                        // Create a session.
                        final Session consumerSession = consumerConnection
                                .createSession(false, Session.AUTO_ACKNOWLEDGE);
                    
                        // Create a queue named "MyQueue".
                        final Destination consumerDestination = consumerSession
                                .createQueue("MyQueue");
                    
                        // Create a message consumer from the session to the queue.
                        final MessageConsumer consumer = consumerSession
                                .createConsumer(consumerDestination);
                    
                        // Begin to wait for messages.
                        final Message consumerMessage = consumer.receive(1000);
                    
                        // Receive the message when it arrives.
                        final TextMessage consumerTextMessage = (TextMessage) consumerMessage;
                        System.out.println("Message received: " + consumerTextMessage.getText());
                    
                        // Clean up the consumer.
                        consumer.close();
                        consumerSession.close();
                        consumerConnection.close();
                    }
                    
                    private static PooledConnectionFactory
                    createPooledConnectionFactory(ActiveMQConnectionFactory connectionFactory) {
                        // Create a pooled connection factory.
                        final PooledConnectionFactory pooledConnectionFactory =
                                new PooledConnectionFactory();
                        pooledConnectionFactory.setConnectionFactory(connectionFactory);
                        pooledConnectionFactory.setMaxConnections(10);
                        return pooledConnectionFactory;
                    }
                    
                    private static ActiveMQConnectionFactory createActiveMQConnectionFactory() {
                        // Create a connection factory.
                        final ActiveMQConnectionFactory connectionFactory =
                                new ActiveMQConnectionFactory(WIRE_LEVEL_ENDPOINT);
                    
                        // Pass the sign-in credentials.
                        connectionFactory.setUserName(ACTIVE_MQ_USERNAME);
                        connectionFactory.setPassword(ACTIVE_MQ_PASSWORD);
                        return connectionFactory;
                    }
                    }

/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  https://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */
                    
                    import org.eclipse.paho.client.mqttv3.*;
                    
                    public class AmazonMQExampleMqtt implements MqttCallback {
                    
                    // Specify the connection parameters.
                    private final static String WIRE_LEVEL_ENDPOINT =
                            "ssl://b-1234a5b6-78cd-901e-2fgh-3i45j6k178l9-1.mq.us-east-2.amazonaws.com:8883";
                    private final static String ACTIVE_MQ_USERNAME = "MyUsername123";
                    private final static String ACTIVE_MQ_PASSWORD = "MyPassword456";
                    
                    public static void main(String[] args) throws Exception {
                        new AmazonMQExampleMqtt().run();
                    }
                    
                    private void run() throws MqttException, InterruptedException {
                    
                        // Specify the topic name and the message text.
                        final String topic = "myTopic";
                        final String text = "Hello from Amazon MQ!";
                    
                        // Create the MQTT client and specify the connection options.
                        final String clientId = "abc123";
                        final MqttClient client = new MqttClient(WIRE_LEVEL_ENDPOINT, clientId);
                        final MqttConnectOptions connOpts = new MqttConnectOptions();
                    
                        // Pass the sign-in credentials.
                        connOpts.setUserName(ACTIVE_MQ_USERNAME);
                        connOpts.setPassword(ACTIVE_MQ_PASSWORD.toCharArray());
                    
                        // Create a session and subscribe to a topic filter.
                        client.connect(connOpts);
                        client.setCallback(this);
                        client.subscribe("+");
                    
                        // Create a message.
                        final MqttMessage message = new MqttMessage(text.getBytes());
                    
                        // Publish the message to a topic.
                        client.publish(topic, message);
                        System.out.println("Published message.");
                    
                        // Wait for the message to be received.
                        Thread.sleep(3000L);
                    
                        // Clean up the connection.
                        client.disconnect();
                    }
                    
                    @Override
                    public void connectionLost(Throwable cause) {
                        System.out.println("Lost connection.");
                    }
                    
                    @Override
                    public void messageArrived(String topic, MqttMessage message) throws MqttException {
                        System.out.println("Received message from topic " + topic + ": " + message);
                    }
                    
                    @Override
                    public void deliveryComplete(IMqttDeliveryToken token) {
                        System.out.println("Delivered message.");
                    }
                    }     

/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  https://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */
                    
                    import org.springframework.messaging.converter.StringMessageConverter;
                    import org.springframework.messaging.simp.stomp.*;
                    import org.springframework.web.socket.WebSocketHttpHeaders;
                    import org.springframework.web.socket.client.WebSocketClient;
                    import org.springframework.web.socket.client.standard.StandardWebSocketClient;
                    import org.springframework.web.socket.messaging.WebSocketStompClient;
                    
                    import java.lang.reflect.Type;
                    
                    public class AmazonMQExampleStompWss {
                    
                    // Specify the connection parameters.
                    private final static String DESTINATION = "/queue";
                    private final static String WIRE_LEVEL_ENDPOINT =
                            "wss://b-1234a5b6-78cd-901e-2fgh-3i45j6k178l9-1.mq.us-east-2.amazonaws.com:61619";
                    private final static String ACTIVE_MQ_USERNAME = "MyUsername123";
                    private final static String ACTIVE_MQ_PASSWORD = "MyPassword456";
                    
                    public static void main(String[] args) throws Exception {
                        final AmazonMQExampleStompWss example = new AmazonMQExampleStompWss();
                    
                        final StompSession stompSession = example.connect();
                        System.out.println("Subscribed to a destination using session.");
                        example.subscribeToDestination(stompSession);
                    
                        System.out.println("Sent message to session.");
                        example.sendMessage(stompSession);
                        Thread.sleep(60000);
                    }
                    
                    private StompSession connect() throws Exception {
                        // Create a client.
                        final WebSocketClient client = new StandardWebSocketClient();
                        final WebSocketStompClient stompClient = new WebSocketStompClient(client);
                        stompClient.setMessageConverter(new StringMessageConverter());
                    
                        final WebSocketHttpHeaders headers = new WebSocketHttpHeaders();
                    
                        // Create headers with authentication parameters.
                        final StompHeaders head = new StompHeaders();
                        head.add(StompHeaders.LOGIN, ACTIVE_MQ_USERNAME);
                        head.add(StompHeaders.PASSCODE, ACTIVE_MQ_PASSWORD);
                    
                        final StompSessionHandler sessionHandler = new MySessionHandler();
                    
                        // Create a connection.
                        return stompClient.connect(WIRE_LEVEL_ENDPOINT, headers, head,
                                sessionHandler).get();
                    }
                    
                    private void subscribeToDestination(final StompSession stompSession) {
                        stompSession.subscribe(DESTINATION, new MyFrameHandler());
                    }
                    
                    private void sendMessage(final StompSession stompSession) {
                        stompSession.send(DESTINATION, "Hello from Amazon MQ!".getBytes());
                    }
                    
                    private static class MySessionHandler extends StompSessionHandlerAdapter {
                        public void afterConnected(final StompSession stompSession,
                                                final StompHeaders stompHeaders) {
                            System.out.println("Connected to broker.");
                        }
                    }
                    
                    private static class MyFrameHandler implements StompFrameHandler {
                        public Type getPayloadType(final StompHeaders headers) {
                            return String.class;
                        }
                    
                        public void handleFrame(final StompHeaders stompHeaders,
                                                final Object message) {
                            System.out.print("Received message from topic: " + message);
                        }
                    }
                    }