Java Message Service version 2 ：使用JMS完成pub/sub

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public class Chat implements MessageListener{        private TopicSession pubSession;        private TopicPublisher publisher;        private TopicConnection connection;        private String username;                public Chat(String topicFatory, String topicName, String username) throws NamingException, JMSException {                InitialContext ctx = new InitialContext();//从properties配置文件获取JDNI连接                //查找一个JMS连接工厂并创建连接                TopicConnectionFactory conFactory = (TopicConnectionFactory) ctx.lookup(topicFatory);                TopicConnection connection = conFactory.createTopicConnection();                //创建两个JMS会话对象（发布/订阅）                TopicSession pubSession = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);                TopicSession subSession = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);                //查找一个JMS主题                Topic chatTopic = (Topic) ctx.lookup(topicName);                TopicPublisher publisher = pubSession.createPublisher(chatTopic);                TopicSubscriber subscriber = subSession.createSubscriber(chatTopic, null, true);                //设置一个JMS消息侦听器                subscriber.setMessageListener(this);                //初始化Chat应用程序变量                this.connection = connection;                this.pubSession = pubSession;                this.publisher = publisher;                this.username = username;                //启动JMS连接                connection.start();        }                public void onMessage(Message message) {                TextMessage textMessage = (TextMessage) message;                try {                        System.out.println(textMessage.getText());                } catch (JMSException e) {                        e.printStackTrace();                }        }                protected void writeMessage(String text) throws JMSException {                TextMessage message = pubSession.createTextMessage();                message.setText(username+": "+text);                publisher.publish(message);        }                public void close() throws JMSException {                connection.close();        }                public static void main(String[] args) {                if(args.length != 3)                        System.out.println("Factory , Topoc , or username missing");                try {                        Chat chat = new Chat(args[0],args[1],args[2]);                        BufferedReader commandLine = new BufferedReader(new InputStreamReader(System.in));                         while(true){                                String s = commandLine.readLine();                                if(s.equalsIgnoreCase("exit")){                                        chat.clone();                                        System.exit(0);                                } else                                         chat.writeMessage(s);                        }                } catch (Exception e) {                        e.printStackTrace();                }        }}
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