JMS programming mode

Message format:
Establishes a message queue between two clients through peer-to-peer transmission through queues.
Note: similar to the queue in the data structure, the first-in-first-out
Topic message. Create a topic in the message middleware. No client can send messages to this topic to accept messages.

Note: broadcast-like methods

Development Process:

 

Procedure for using JMS

1. Create a JNDI Context

Context init initCtx = new InitialContext (env );

2. Find the Factory class used to create a JMS connection (Connnect Factory)

For topic messages:

Object tmp = initCtx. lookup ("Connnect Factory ");

TopicConnectionFactory tcf = (TopicConnectionFactory) tmp;

For point-to-point messages:

Object tmp = initCtx. lookup ("Connnect Factory ");

QueueConnectionFactory tcf = (QueueConnectionFactory) tmp;

3. Find the Destination object (Destination) of JMS)

For topic messages:

Topic topic = (Topic) iniCtx. lookup ("topic/testTopic ");

For point-to-point messages:

Queue queue (Queue) iniCtx. lookup ("queue/");

4. Create a JMS Connection)

For topic messages:

TopicConnection conn = tcp. createTopicConnection ();

For point-to-point messages:

QueueConnection conn = tcp. createQueueConnection ();

5. Create a JMS session)

For topic messages:

TopicSession session = conn. createTopicSession (fasle, Session. AUTO_ACKNOWLEDGE );

For point-to-point messages:

QueueSession session = conn. createQueueSession (true, 0 );

6. Create a message producer and consumer

Producer:

For topic messages:

TopicPublisher publisher = session. createPublisher (topic );

For point-to-point messages:

QueueSender sender = session. createSender (queue );

Consumer:

For topic messages:

TopicSubscriber subscriber = session. createSubscriber (topic );

For point-to-point messages:

QueueReceiver receiver = session. createReceiver (queue );

7. register the message listener

For topic messages:

TextListener listener = new TextListener ();

Subscriber. setMessageListener (listener );

For point-to-point messages:

TextListener listener = new TextListener ();

Receiver. setMessageListener (listener );

8. Start the JMS connection

Conn. start ();

9. send and receive messages

Send message:

For topic messages:

Publisher. publish (message );

For point-to-point messages:

Sender. send (message );

Receive message:

For topic messages:

Message msg = subscriber. receive ();

For point-to-point messages:

Message msg = receiver. receive (1000 );

10. Stop and close the JMS connection

Conn. stop ();

Session. close ();

Conn. close ();

From: http://www.mldn.cn/articleview/2007-2-6/article_view_1377.htm