JMS sending and receiving instance-publishing/subscription Mode

Send message

No matter whether a message is sent to a queue or published to a topic, the programming steps are the same. The difference is that different JMS objects are used. The specific definitions are shown in the following table:

The process of sending messages is roughly divided into the following steps;

1. Get a reference to the Weblogic server context;

2. Create a connection factory;

3. Use the connection factory to create a connection;

4. Use a connection to create a session;

5. Obtain a purpose;

6. Create a message producer using sessions and purposes;

7. Create a message object;

8. Create an instance of the message type to be sent using the connection;

9. Use a connected queue sender or topic publisher to send messages using the sender or publisher.

Before coding, import the required jar package and configure the JMS server.

 

Note:

Wlfullclient. jar is generated by entering the Weblogic installation directory, for example, C: \ oracle \ middleware \ wlserver_10.3 \ Server \ Lib. run Java-jar wljarbuilder. jar to generate the wlfullclient. jar file.

For details about how to configure a Message Server in WebLogic Server, refer to "Learn how to configure a Message Server in WebLogic Server ".
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Message sending code:

Package COM. xu. pub2sub; import Java. util. properties; import javax. JMS. jmsexception; import javax. JMS. session; import javax. JMS. textmessage; import javax. JMS. topic; import javax. JMS. topicconnection; import javax. JMS. topicconnectionfactory; import javax. JMS. topicpublisher; import javax. JMS. topicsession; import javax. naming. context; import javax. naming. initialcontext; import javax. naming. namingexception; Public Cl Ass msgtopicproducer {/*** @ function: topic sender * @ Author: * @ Date: 2012-10-18 */private topicpublisher publisher; private textmessage MSG; Public msgtopicproducer (string [] ARGs) throws namingexception, jmsexception {/* initialize the context object */string url = "T3: // localhost: 7001"; properties P = new properties (); p. put (context. initial_context_factory, "weblogic. JNDI. wlinitialcontextfactory "); p. put (context. provider_url, URL); Context CTX = New initialcontext (p);/* create a connection factory */topicconnectionfactory tconfactory = (topicconnectionfactory) CTX. lookup ("weblogic. JMS. connectionfactory ");/* Create A Topic */topic messagetopic = (topic) CTX. lookup ("JMS/mytopic");/* create a connection */topicconnection tcon = tconfactory. createtopicconnection ();/* Create a session */topicsession session = tcon. createtopicsession (false, session. auto_acknowledge);/* Create a topic publisher and send messages */publisher = Se Ssion. createpublisher (messagetopic); MSG = session. createtextmessage ();} public void runclient () throws jmsexception {MSG. settext ("hello"); Publisher. publish (MSG); MSG. settext ("Welcome to JMS! "); Publisher. Publish (MSG); system. Out. println (" successful! ");} Public static void main (string [] ARGs) throws namingexception, jmsexception {msgtopicproducer MP = new msgtopicproducer (ARGs); MP. runclient ();}}

Synchronous receiver code:

Package COM. xu. pub2sub; import Java. util. properties; import javax. JMS. jmsexception; import javax. JMS. session; import javax. JMS. textmessage; import javax. JMS. topic; import javax. JMS. topicconnection; import javax. JMS. topicconnectionfactory; import javax. JMS. topicsession; import javax. JMS. topicsubscriber; import javax. naming. context; import javax. naming. initialcontext; import javax. naming. namingexception; public class syncmessagetopicreceiver {/*** @ function: publish-subscribe Message Service synchronization receiver * @ Author: * @ Date: 2012-10-18 */private topicsubscriber subscriber; private textmessage MSG; public syncmessagetopicreceiver () throws namingexception, jmsexception {/* initialize the context object */string url = "T3: // localhost: 7001"; properties P = new properties (); p. put (context. initial_context_factory, "weblogic. JNDI. wlinitialcontextfactory "); p. put (context. provider_url, URL); Context CTX = new initialcontext (p);/* Create a topic connection factory */topicconnectionfactory tconfactory = (topicconnectionfactory) CTX. lookup ("weblogic. JMS. connectionfactory ");/* Create A Topic */topic messagetopic = (topic) CTX. lookup ("JMS/mytopic");/* create a connection */topicconnection tcon = tconfactory. createtopicconnection ();/* Create session */topicsession session = tcon. createtopicsession (false, session. auto_acknowledge);/* Create receiver */subscriber = session. createsubscriber (messagetopic); tcon. start ();} public void runclient () throws jmsexception {MSG = (textmessage) subscriber. receive (); system. out. println ("er Er:" + MSG. gettext (); MSG = (textmessage) subscriber. receive (); system. out. println ("er Er:" + MSG. gettext ();} public static void main (string [] ARGs) throws namingexception, jmsexception {syncmessagetopicreceiver extends ER = new syncmessagetopicreceiver (); extends er. runclient ();}}

Asynchronous Receiver code:

Package COM. xu. pub2sub; import Java. util. properties; import javax. JMS. jmsexception; import javax. JMS. message; import javax. JMS. messagelistener; import javax. JMS. session; import javax. JMS. textmessage; import javax. JMS. topic; import javax. JMS. topicconnection; import javax. JMS. topicconnectionfactory; import javax. JMS. topicsession; import javax. JMS. topicsubscriber; import javax. naming. context; import javax. naming. initialcontext; import javax. naming. namingexception; public class asyncmessagetopicreceiver implements messagelistener {/*** @ function: publish-subscribe to message service to receive messages asynchronously * @ Author: * @ Date: 2012-10-18 */private int expected_message_count = 10; private int messagecount = 0; private topicsubscriber subscriber; Public asyncmessagetopicreceiver () throws namingexception, jmsexception {/* initialize the context object */string url = "T3: // localhost: 7001 "; properties P = new properties (); p. put (context. initial_context_factory, "weblogic. JNDI. wlinitialcontextfactory "); p. put (context. provider_url, URL); Context CTX = new initialcontext (p);/* Create a topic connection factory */topicconnectionfactory tconfactory = (topicconnectionfactory) CTX. lookup ("weblogic. JMS. connectionfactory ");/* Create A Topic */topic messagetopic = (topic) CTX. lookup ("JMS/mytopic");/* create a connection */topicconnection tcon = tconfactory. createtopicconnection ();/* Create session */topicsession session = tcon. createtopicsession (false, session. auto_acknowledge);/* Create receiver */subscriber = session. createsubscriber (messagetopic);/* Set listener */subscriber. setmessagelistener (this); tcon. start ();} public Boolean expectmoremessage () {return messagecount <expected_message_count;} @ overridepublic void onmessage (message) {system. out. println ("onmessage"); try {textmessage MSG = (textmessage) message; system. out. println ("er Er:" + MSG. gettext ();} catch (jmsexception E1) {// todo auto-generated catch blocke1.printstacktrace ();} messagecount ++;} public static void main (string [] ARGs) throws namingexception, jmsexception {int max_tries = 30; int trycount = 0; asyncmessagetopicreceiver extends ER = new asyncmessagetopicreceiver (); While (extends er. expectmoremessage () & (trycount <max_tries) {try {system. out. println (trycount); thread. sleep (1000);} catch (interruptedexception e) {// todo auto-generated catch blocke. printstacktrace () ;}trycount ++ ;}}}

 

 

 

 

 

 

 

 

 

 

 

 

 

Wlfullclient. jar is generated by entering the Weblogic installation directory, for example, C: \ oracle \ middleware \ wlserver_10.3 \ Server \ Lib. run Java-jar wljarbuilder. jar to generate the wlfullclient. jar file.