activemq-queue-Browser

其他相关：
http://wangxinchun.iteye.com/blog/2145998
http://wangxinchun.iteye.com/blog/2145958

对于mq队列中的消息，有时候需要做监控或者问题跟踪要看看mq的数据，又要保证看后数据不会删除（比如：p2p 一旦consumer.receive 后mq不会发送其他consumer），mq提供了查看消息的功能。

最关键的代码为：
Queue destination = session.createQueue("test-queue");
QueueBrowser browser = session.createBrowser(destination);
Enumeration<?> enumeration = browser.getEnumeration();



案例如下：

public class Browser {
    private static final String BROKER_URL = "tcp://localhost:61616";
    private static final Boolean NON_TRANSACTED = false;
    private static final long DELAY = 100;

    public static void main(String[] args) {
        String url = BROKER_URL;
        if (args.length > 0) {
            url = args[0].trim();
        }
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("admin", "password", url);
        Connection connection = null;
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            Session session = connection.createSession(NON_TRANSACTED, Session.AUTO_ACKNOWLEDGE);
            Queue destination = session.createQueue("test-queue");
            QueueBrowser browser = session.createBrowser(destination);
            Enumeration<?> enumeration = browser.getEnumeration();
            while (enumeration.hasMoreElements()) {
                TextMessage message = (TextMessage) enumeration.nextElement();
                System.out.println("Browsing: " + message.getText());
                TimeUnit.MILLISECONDS.sleep(DELAY);
            }
            session.close();
        } catch (Exception e) {
            System.out.println("Caught exception!");
        }
        finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                    System.out.println("Could not close an open connection...");
                }
            }
        }
    }
}