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本篇内容介绍了“JMS的代码怎么写”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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private Session session;
private boolean transacted = false;
private MessageProducer replyProducer;
private MessageProtocol messageProtocol;
static {
messageBrokerUrl = "tcp://localhost:61616";
messageQueueName = "client.messages";
ackMode = Session.AUTO_ACKNOWLEDGE;
}
public Server() {
try {
//This message broker is embedded
BrokerService broker = new BrokerService();
broker.setPersistent(false);
broker.setUseJmx(false);
broker.addConnector(messageBrokerUrl);
broker.start();
} catch (Exception e) {
//Handle the exception appropriately
}
//Delegating the handling of messages to another class, instantiate it before setting up JMS so it
//is ready to handle messages
this.messageProtocol = new MessageProtocol();
this.setupMessageQueueConsumer();
}
private void setupMessageQueueConsumer() {
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(messageBrokerUrl);
Connection connection;
try {
connection = connectionFactory.createConnection();
connection.start();
this.session = connection.createSession(this.transacted, ackMode);
Destination adminQueue = this.session.createQueue(messageQueueName);
//Setup a message producer to respond to messages from clients, we will get the destination
//to send to from the JMSReplyTo header field from a Message
this.replyProducer = this.session.createProducer(null);
this.replyProducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
//Set up a consumer to consume messages off of the admin queue
MessageConsumer consumer = this.session.createConsumer(adminQueue);
consumer.setMessageListener(this);
} catch (JMSException e) {
//Handle the exception appropriately
}
}
public void onMessage(Message message) {
try {
TextMessage response = this.session.createTextMessage();
if (message instanceof TextMessage) {
TextMessage txtMsg = (TextMessage) message;
String messageText = txtMsg.getText();
response.setText(this.messageProtocol.handleProtocolMessage(messageText));
}
//Set the correlation ID from the received message to be the correlation id of the response message
//this lets the client identify which message this is a response to if it has more than
//one outstanding message to the server
response.setJMSCorrelationID(message.getJMSCorrelationID());
//Send the response to the Destination specified by the JMSReplyTo field of the received message,
//this is presumably a temporary queue created by the client
this.replyProducer.send(message.getJMSReplyTo(), response);
} catch (JMSException e) {
//Handle the exception appropriately
}
}
public static void main(String[] args) {
new Server();
}private boolean transacted = false;
private MessageProducer producer;
static {
clientQueueName = "client.messages";
ackMode = Session.AUTO_ACKNOWLEDGE;
}
public Client() {
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:61616");
Connection connection;
try {
connection = connectionFactory.createConnection();
connection.start();
Session session = connection.createSession(transacted, ackMode);
Destination adminQueue = session.createQueue(clientQueueName);
//Setup a message producer to send message to the queue the server is consuming from
this.producer = session.createProducer(adminQueue);
this.producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
//Create a temporary queue that this client will listen for responses on then create a consumer
//that consumes message from this temporary queue...for a real application a client should reuse
//the same temp queue for each message to the server...one temp queue per client
Destination tempDest = session.createTemporaryQueue();
MessageConsumer responseConsumer = session.createConsumer(tempDest);
//This class will handle the messages to the temp queue as well
responseConsumer.setMessageListener(this);
//Now create the actual message you want to send
TextMessage txtMessage = session.createTextMessage();
txtMessage.setText("MyProtocolMessage");
//Set the reply to field to the temp queue you created above, this is the queue the server
//will respond to
txtMessage.setJMSReplyTo(tempDest);
//Set a correlation ID so when you get a response you know which sent message the response is for
//If there is never more than one outstanding message to the server then the
//same correlation ID can be used for all the messages...if there is more than one outstanding
//message to the server you would presumably want to associate the correlation ID with this
//message somehow...a Map works good
String correlationId = this.createRandomString();
txtMessage.setJMSCorrelationID(correlationId);
this.producer.send(txtMessage);
} catch (JMSException e) {
//Handle the exception appropriately
}
}
private String createRandomString() {
Random random = new Random(System.currentTimeMillis());
long randomLong = random.nextLong();
return Long.toHexString(randomLong);
}
public void onMessage(Message message) {
String messageText = null;
try {
if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
messageText = textMessage.getText();
System.out.println("messageText = " + messageText);
}
} catch (JMSException e) {
//Handle the exception appropriately
}
}
public static void main(String[] args) {
new Client();
}return responseText; }
“JMS的代码怎么写”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注创新互联网站，小编将为大家输出更多高质量的实用文章！
