131 lines
4.9 KiB
HTML
131 lines
4.9 KiB
HTML
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<html>
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<head>
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<title>ActiveMQ Stomp Example</title>
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<link rel="stylesheet" type="text/css" href="../common/common.css" />
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<link rel="stylesheet" type="text/css" href="../common/prettify.css" />
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<script type="text/javascript" src="../common/prettify.js"></script>
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</head>
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<body onload="prettyPrint()">
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<h1>Stomp Example</h1>
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<p>This example shows you how to configure ActiveMQ to send and receive Stomp messages.</p>
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<p>The example will start a ActiveMQ server configured with Stomp and JMS.</p>
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<p>The client will open a socket to send one Stomp message (using TCP directly).
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The client will then consume a message from a JMS Queue and check it is the message sent with Stomp.</p>
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<h2>Example step-by-step</h2>
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<p><i>To run the example, simply type <code>mvn verify -Pexample</code> from this directory</i></p>
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<ol>
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<li>We create a TCP socket to connect to the Stomp port
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<pre class="prettyprint">
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Socket socket = new Socket("localhost", 61613);
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</pre>
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<li>We send a CONNECT frame to connect to the server</li>
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<pre class="prettyprint">
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String connectFrame = "CONNECT\n" +
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"login: guest\n" +
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"passcode: guest\n" +
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"request-id: 1\n" +
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"\n" +
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Stomp.NULL;
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sendFrame(socket, connectFrame);
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</pre>
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<li>We send a SEND frame (a Stomp message) to the destination <code>jms.queue.exampleQueue</code>
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(which corresponds to the ActiveMQ address for the JMS Queue <code>exampleQueue</code>) with a text body</li>
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<pre class="prettyprint">
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String text = "Hello, world from Stomp!";
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String message = "SEND\n" +
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"destination: jms.queue.exampleQueue\n" +
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"\n" +
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text +
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Stomp.NULL;
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sendFrame(socket, message);
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System.out.println("Sent Stomp message: " + text);
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</pre>
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<li>We send a DISCONNECT frame to disconnect from the server</li>
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<pre class="prettyprint">
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String disconnectFrame = "DISCONNECT\n" +
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"\n" +
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Stomp.NULL;
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sendFrame(socket, disconnectFrame);
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</pre>
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<li>We close the TCP socket</li>
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<pre class="prettyprint">
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socket.close();
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</pre>
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<li>We create an initial context to perform the JNDI lookup.</li>
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<pre class="prettyprint">
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initialContext = getContext(0);
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</pre>
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<li>We perform a lookup on the queue and the connection factory</li>
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<pre class="prettyprint">
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Queue queue = (Queue)initialContext.lookup("/queue/exampleQueue");
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ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("/ConnectionFactory");
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</pre>
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<li>We create a JMS Connection, Session and a MessageConsumer on the queue</li>
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<pre class="prettyprint">
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connection = cf.createConnection();
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Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
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MessageConsumer consumer = session.createConsumer(queue);
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</pre>
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<li>We start the connection</li>
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<pre class="prettyprint">
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<code>connection.start();</code>
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</pre>
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<li>We receive the message. Stomp messages are mapped to JMS TextMessage.</li>
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<pre class="prettyprint">
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TextMessage messageReceived = (TextMessage)consumer.receive(5000);
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System.out.println("Received JMS message: " + messageReceived.getText());
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</pre>
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<li>And finally, <b>always</b> remember to close your JMS connections and resources after use, in a <code>finally</code> block. Closing a JMS connection will automatically close all of its sessions, consumers, producer and browser objects</li>
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<pre class="prettyprint">
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<code>finally
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{
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if (initialContext != null)
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{
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initialContext.close();
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}
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if (connection != null)
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{
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connection.close();
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}
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}</code>
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</pre>
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</ol>
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</body>
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</html>
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