Simple Example of ActiveMQ receiving and sending messages

ActiveMQ is a simple instance of ActiveMQ-ActiveMQ receiving + message sending JMS message framework-ActiveMQ recently used ActiveMQ because of the company's project requirements. There are not many online examples, and some of them are incomplete. After several days of study, I found a suitable solution on the Internet. My IT resource library http://itlib.tk/producertool.javais used for message sending: java code package homework; import javax. jms. connection; import javax. jms. deliveryMode; import javax. jms. destination; import javax. jms. JMSException; import javax. jms. messageProducer; import javax. jms. session; import javax. jms. textMessage; import org. apache. activemq. activeMQConnection; import org. apache. activemq. activeMQConnectionFactory; public clas S ProducerTool {private String user = ActiveMQConnection. DEFAULT_USER; private String password = ActiveMQConnection. DEFAULT_PASSWORD; private String url = ActiveMQConnection. DEFAULT_BROKER_URL; private String subject = "TOOL. DEFAULT "; private Destination destination = null; private Connection connection = null; private Session session = null; private MessageProducer producer = null; // initialize privat E void initialize () throws JMSException, Exception {ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory (user, password, url); connection = connectionFactory. createConnection (); session = connection. createSession (false, Session. AUTO_ACKNOWLEDGE); destination = session. createQueue (subject); producer = session. createProducer (destination); producer. setDeliveryMode (DeliveryMod E. NON_PERSISTENT);} // send the public void produceMessage (String message) throws JMSException, Exception {initialize (); TextMessage msg = session. createTextMessage (message); connection. start (); System. out. println ("Producer:-> Sending message:" + message); producer. send (msg); System. out. println ("Producer:-> Message sent complete! ");} // Close the connection public void close () throws JMSException {System. out. println (" Producer:-> Closing connection "); if (producer! = Null) producer. close (); if (session! = Null) session. close (); if (connection! = Null) connection. close () ;}} ConsumerTool. java is used to receive messages. I use a message listening mechanism and need to implement the MessageListener interface. This interface has an onMessage method, when a message is received, this function is automatically called to process the message. Java code package homework; import javax. jms. connection; import javax. jms. destination; import javax. jms. JMSException; import javax. jms. messageConsumer; import javax. jms. session; import javax. jms. messageListener; import javax. jms. message; import javax. jms. textMessage; import org. apache. activemq. activeMQConnection; import org. apache. activemq. activeMQConnectionFactory; public class ConsumerTool implemen Ts MessageListener {private String user = ActiveMQConnection. DEFAULT_USER; private String password = ActiveMQConnection. DEFAULT_PASSWORD; private String url = ActiveMQConnection. DEFAULT_BROKER_URL; private String subject = "TOOL. DEFAULT "; private Destination destination = null; private Connection connection = null; private Session session = null; private MessageConsumer consumer = null; // initialize pr Ivate void initialize () throws JMSException, Exception {ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory (user, password, url); connection = connectionFactory. createConnection (); session = connection. createSession (false, Session. AUTO_ACKNOWLEDGE); destination = session. createQueue (subject); consumer = session. createConsumer (destination);} // consume the message public void consumeMes Sage () throws JMSException, Exception {initialize (); connection. start (); System. out. println ("Consumer:-> Begin listening... "); // start listening for consumer. setMessageListener (this); // Message message = consumer. receive ();} // close the connection public void close () throws JMSException {System. out. println ("Consumer:-> Closing connection"); if (consumer! = Null) consumer. close (); if (session! = Null) session. close (); if (connection! = Null) connection. close () ;}// Message processing function public void onMessage (message) {try {if (message instanceof TextMessage) {TextMessage txtMsg = (TextMessage) Message; String msg = txtMsg. getText (); System. out. println ("Consumer:-> Received:" + msg);} else {System. out. println ("Consumer:-> Received:" + message) ;}} catch (JMSException e) {// TODO Auto-generated catch block e. printStackTrace ();}} If You Want To actively accept the message, instead of using the message listener, set consumer. setMessageListener (this) is changed to Message message = consumer. receive (), manually call the receive method of MessageConsumer. Below is the Test class. java: java code package homework; import javax. jms. JMSException; public class Test {/*** @ param args */public static void main (String [] args) throws JMSException, exception {// TODO Auto-generated method stub ConsumerTool consumer = new ConsumerTool (); ProducerTool producer = new ProducerTool (); // start to listen to consumer. consumeMessage (); // The message Thread is sent 500 milliseconds later. sleep (500); producer. produceMess Age ("Hello, world! "); Producer. close (); // stop receiving message Thread after 500 milliseconds of delay. sleep (500); consumer. close () ;}} a simple ActiveMQ instance-ActiveMQ receives and sends messages