94 lines
3.8 KiB
HTML
94 lines
3.8 KiB
HTML
<!--
|
|
Licensed to the Apache Software Foundation (ASF) under one
|
|
or more contributor license agreements. See the NOTICE file
|
|
distributed with this work for additional information
|
|
regarding copyright ownership. The ASF licenses this file
|
|
to you under the Apache License, Version 2.0 (the
|
|
"License"); you may not use this file except in compliance
|
|
with the License. You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing,
|
|
software distributed under the License 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.
|
|
-->
|
|
|
|
<html>
|
|
<head>
|
|
<title>ActiveMQ JMS Context Example</title>
|
|
<link rel="stylesheet" type="text/css" href="../common/common.css" />
|
|
<link rel="stylesheet" type="text/css" href="../common/prettify.css" />
|
|
<script type="text/javascript" src="../common/prettify.js"></script>
|
|
</head>
|
|
<body onload="prettyPrint()">
|
|
<h1>JMS Context Example</h1>
|
|
|
|
<p>This example shows you how to send and receive a message to a JMS Queue using ActiveMQ by using a JMS Context</p>
|
|
<p>A JMSContext is part of JMS 2.0 and combines the JMS Connection and Session Objects into a simple Interface</p>
|
|
|
|
<h2>Example step-by-step</h2>
|
|
<p><i>To run the example, simply type <code>mvn verify</code> from this directory</i></p>
|
|
|
|
<ol>
|
|
<li>First we need to get an initial context so we can look-up the JMS connection factory and destination objects from JNDI. This initial context will get it's properties from the <code>client-jndi.properties</code> file in the directory <code>../common/config</code></li>
|
|
<pre class="prettyprint">
|
|
<code>InitialContext initialContext = getContext();</code>
|
|
</pre>
|
|
|
|
<li>We look-up the JMS queue object from JNDI</li>
|
|
<pre class="prettyprint">
|
|
<code>Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");</code>
|
|
</pre>
|
|
|
|
<li>We look-up the JMS connection factory object from JNDI</li>
|
|
<pre class="prettyprint">
|
|
<code>ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");</code>
|
|
</pre>
|
|
|
|
<li>We create a JMS context</li>
|
|
<pre class="prettyprint">
|
|
<code>jmsContext = cf.createContext();</code>
|
|
</pre>
|
|
|
|
<li>We create a JMS Producer, set the delivery mode and send a message all in one line. Note that we don't pass
|
|
a message to the send method but just a String.</li>
|
|
<pre class="prettyprint">
|
|
<code>jmsContext.createProducer().setDeliveryMode(DeliveryMode.PERSISTENT).send(queue, "this is a string")</code>
|
|
</pre>
|
|
|
|
<li>We create a JMS message consumer and receive the payload of the message directly</li>
|
|
<pre class="prettyprint">
|
|
<code>String payLoad = jmsContext.createConsumer(queue).receiveBody(String.class);</code>
|
|
</pre>
|
|
|
|
<li>We create a JMS text message that we are going to send.</li>
|
|
<pre class="prettyprint">
|
|
<code>TextMessage message = session.createTextMessage("This is a text message");</code>
|
|
</pre>
|
|
|
|
<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>
|
|
|
|
<pre class="prettyprint">
|
|
<code>finally
|
|
{
|
|
if (initialContext != null)
|
|
{
|
|
initialContext.close();
|
|
}
|
|
if (jmsContext != null)
|
|
{
|
|
jmsContext.close();
|
|
}
|
|
}</code>
|
|
</pre>
|
|
|
|
|
|
|
|
</ol>
|
|
</body>
|
|
</html>
|