MQ的ack

老外总结的真是好.

https://timjansen.github.io/jarfiller/guide/jms/standaloneclient.xhtml#activemqsetup

Sending and Receiving Messages (Standalone Client)

Sending a message
(more)

ConnectionFactory factory = 
  new ActiveMQConnectionFactory("tcp://localhost:61616");  // ActiveMQ-specific (more)

Connection con = factory.createConnection();

try {
  Session session = 
      con.createSession(false, Session.AUTO_ACKNOWLEDGE);  // non-transacted session (more)

  Queue queue = session.createQueue("test.queue");         // only specifies queue name (more)

  MessageProducer producer = session.createProducer(queue);
  Message msg = session.createTextMessage("hello queue");  // text message (more)
  producer.send(msg);
}
finally {
  con.close();                                             // free all resources (more)
}

Polling for messages
(more)

ConnectionFactory factory = 
  new ActiveMQConnectionFactory("tcp://localhost:61616");  // ActiveMQ-specific (more)

Connection con = factory.createConnection();

try {
  Session session = 
      con.createSession(false, Session.AUTO_ACKNOWLEDGE);  // non-transacted session (more)

  Queue queue = session.createQueue("test.queue");         // only specifies queue name (more)

  MessageConsumer consumer = session.createConsumer(queue);

  con.start();                                             // start the connection (more)
  while (true) {                                           // run forever
    Message msg = consumer.receive();                      // blocking! (more)
    if (! (msg instanceof TextMessage))
      throw new RuntimeException("Expected a TextMessage");
    TextMessage tm = (TextMessage) msg;
    System.out.println(tm.getText());                      // print message content
  }
}
finally {
  con.close();                                             // free all resources (more)
}

Using a MessageListener
(more)

ConnectionFactory factory = 
  new ActiveMQConnectionFactory("tcp://localhost:61616");  // ActiveMQ-specific (more)

Connection con = factory.createConnection();

try {
  Session session = 
      con.createSession(false, Session.AUTO_ACKNOWLEDGE);  // non-transacted session (more)

  Queue queue = session.createQueue("test.queue");         // only specifies queue name (more)

  MessageConsumer consumer = session.createConsumer(queue);

  consumer.setMessageListener(new MessageListener() {
    public void onMessage(Message msg) {
      try {
        if (! (msg instanceof TextMessage))
          throw new RuntimeException("no text message");
        TextMessage tm = (TextMessage) msg;
        System.out.println(tm.getText());                  // print message
      }
      catch (JMSException e) {
        System.err.println("Error reading message");
      }
    }
  });

  con.start();                                             // start the connection (more)
  Thread.sleep(60 * 1000);                                 // receive messages for 60s (more)
finally {
  con.close();                                             // free all resources (more)
}

JNDI

Getting the ConnectionFactory via JNDI

The only (relatively) non-implementation-specific way to obtain the JMS implementation's ConnectionFactory and Destinations is to get them from a JNDI server. This is usually only possibly if you write your program as client for an application server. The following example shows how to do this with JBoss:

Hashtable<String,String> env = new Hashtable<String, String>();
env.put("java.naming.factory.initial",                        // JBoss-specific (more)
        "org.jnp.interfaces.NamingContextFactory");
env.put("java.naming.provider.url", "jnp://localhost:1099");  // host address
env.put("java.naming.factory.url.pkgs", 
        "org.jboss.naming:org.jnp.interfaces");
Context ctx = new InitialContext(env);

ConnectionFactory factory = (ConnectionFactory)
           ctx.lookup("/ConnectionFactory");                  // obtain factory (more)
Queue queue = (Queue) 
           ctx.lookup("/queue/JarfillerQueue");               // obtain queue (more)
...

ActiveMQ Setup

How to set up ActiveMQ

Setting up a ActiveMQ server is fairly easy:

• Download a ActiveMQ distribution from activemq.apache.org and unpack it somewhere
• You can start the server immediately, running unsecured on localhost, using the script bin/activemq
• When it is running, you can access your local server's console on http://localhost:8161/admin/
• Configure it by modifying conf/activemq.xml

In order to compile and run the client, just include the JAR files from the server's lib directory in your CLASSPATH.

Websphere MQ Setup

How to set up Websphere MQ

Setting up a client for a Websphere MQ server is similar to ActiveMQ. You only need to create a MQConnectionFactory instance and configure it. The configuration of Websphere MQ is a bit more complicated that ActiveMQ's, because you need to create a queue manager and a channel in the server, and then specify it in the client. But once the client has obtained the ConnectionFactory, the usage is exactly like Active MQ's:

import com.ibm.mq.jms.*;
...
MQConnectionFactory factory = new MQConnectionFactory();
factory.setHostName("localhost");                          // server IP address / name
factory.setTransportType(JMSC.MQJMS_TP_CLIENT_MQ_TCPIP);   // for TCP/IP
factory.setChannel("my.channel");                          // server connection channel to use
factory.setQueueManager("my.queue.manager");               // queue manager to use

In order to compile and run the client, you only need two JAR files: com.ibm.mq.jar and com.ibm.mq.jms.jar. Both should ship with the Websphere MQ client distributions.

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https://timjansen.github.io/jarfiller/guide/jms/achknowledgement.xhtml