Liferay Scheduler

Implement Scheduler in Liferay 6.1

Many times we want our logic to be executed at certain Date/Time .Liferay 6.X comes with in built capability of scheduler. Here is the example which can help you ..!!
1) Make below entry in Liferay-portlet.xml

<scheduler-entry>

 <scheduler-description>test-scheduler</scheduler-description>

   

 <scheduler-event-listener-class>

                     com.test.scheduler.UploadJob

        </scheduler-event-listener-class>

     

 <trigger>

  <cron>

      <cron-trigger-value>0 0 18 * * ? *</cron-trigger-value>

  </cron>

 </trigger>

</scheduler-entry>

This (<cron -trigger-value>0 0 18 * * ? *<cron -trigger-value>) indicates that the scheduler will run every day at 18:00 PM. To know how to write cron expression you can visit below links.
Cron Trigger
Cron Maker

2) create scheduler class.

package com.test.scheduler; import com.liferay.portal.kernel.messaging.Message; import com.liferay.portal.kernel.messaging.MessageListener; import com.liferay.portal.kernel.messaging.MessageListenerException; import com.liferay.portal.kernel.log.Log; import com.liferay.portal.kernel.log.LogFactoryUtil; public class UploadJob implements MessageListener {     private static final Log LOGGER = LogFactoryUtil.getLog(UploadJob.class);     /**      * Job that we need to run on scheduler      */     public void receive(Message arg0) throws MessageListenerException {                         LOGGER.info("Scheduler----> receive()");      //write your logic.                           } }

Source : http://itsliferay.blogspot.in/2012/08/implement-scheduler-in-liferay-61.html

Refer Apporva Blog also :http://www.apoorvaprakash.in/2011/02/liferay-scheduler.html