Sending Local files to a JMS Queue


In our next example we will send local files to a JMS Queue and then view the Queue using the console.

Edit pom.xml

First we need to add the dependencies for JMS as follows:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.skills421.examples.camel</groupId>
<artifactId>CamelBasics</artifactId>
<version>0.0.1-SNAPSHOT</version>

<dependencies>

<!-- Core Camel -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>2.5.0</version>
</dependency>

<!-- Needed for the FTP Component -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-ftp</artifactId>
<version>2.5.0</version>
</dependency>

<!-- Needed for com/jcraft/jsch/Logger - SFTP -->
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.42</version>
</dependency>

<!-- Needed for JMS -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jms</artifactId>
<version>2.5.0</version>
</dependency>

<!-- Needed for ActiveMQ - JMS -->
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-core</artifactId>
<version>5.3.2</version>
</dependency>

<!-- JUnit for testing -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>

</dependencies>

</project>

pom.xml

Create JMSCopier.java

Next we want to create the JMSCopier.java code that will use Camel to send our local files to the JMS Queue.

package com.skills421.examples.camel.basics;

import javax.jms.ConnectionFactory;

import org.apache.activemq.spring.ActiveMQConnectionFactory;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.jms.JmsComponent;
import org.apache.camel.impl.DefaultCamelContext;

public class JMSCopier
{
public void sendFileToJMS(final String filePath, final String queueName) throws Exception
{
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory();

CamelContext context = new DefaultCamelContext();
context.addComponent("jms", JmsComponent.jmsComponentAutoAcknowledge(connectionFactory));

context.addRoutes(new RouteBuilder()
{
public void configure()
{
from("file:"+filePath+"?noop=true").process(new Processor()
{
public void process(Exchange exchange) throws Exception
{
System.out.println("Sending file: "+exchange.getIn().getHeader("CamelFileName"));

}
}).to("jms:queue:"+queueName);
}
});

context.start();
Thread.sleep(10000);
context.stop();
}
}

JMSCopier.java

Note how we have added a process to our from().to() in our configure() methods to give from().process().to().
This enables us to print out a message as each file is processed.

Create JMSCopierTest.java

Next we create the JUnit Test file JMSCopierTest.java as follows:

package com.skills421.examples.camel.basics;

import static org.junit.Assert.*;

import org.junit.Test;

public class JMSCopierTest
{

@Test
public void testSendLocalFilesToJMSQueue()
{
JMSCopier copier = new JMSCopier();

String filePath = "/Users/johndunning/Desktop/Camel/CamelIn";
String queueName = "copierQueue";

try
{
copier.sendFileToJMS(filePath, queueName);
}
catch (Exception e)
{
fail(e.getMessage());
}
}

}

JMSCopierTest.java
Note that you will need to configure the filePath for your local system.

Run the Test

Run the JUnit Test and you should see a log something like the following:

INFO: Apache Camel 2.5.0 (CamelContext: camel-1) is starting
INFO: Successfully connected to tcp://localhost:61616
Sending file: file1.txt
INFO: Successfully connected to tcp://localhost:61616
Sending file: file2.txt
INFO: Successfully connected to tcp://localhost:61616
Sending file: file3.txt
INFO: Apache Camel 2.5.0 (CamelContext: camel-1) is shutdown in 0.008 seconds

Check the ActiveMQ Console

Now open the ActiveMQ Console by entering the following URL into your browser: http://localhost:8161/admin/index.jsp

Remember the default login and password are admin and admin

The console will look something like this:

003-ActiveMQConsole

Click on Queues to see the active message queues and you should see your copierQueue in the queue list:

004-CopierQueue-

Click on copierQueue to see the individual messages

005-Messages

Finally, click on one of the messages and you should see the content of your file under Message Details as follows:

006-Message

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