最近由于公司項(xiàng)目需要,開始學(xué)習(xí)JMS,用的是ActiveMQ。由于這方面網(wǎng)上的例子不是很多,而且有的也不完整。于是經(jīng)過(guò)幾天的摸索學(xué)習(xí),寫了一個(gè)簡(jiǎn)單的小例子,現(xiàn)在貼出來(lái)與大家分享。
ProducerTool.java用于發(fā)送消息:
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 class 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;
// 初始化
private 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(DeliveryMode.NON_PERSISTENT);
}
// 發(fā)送消息
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!");
}
// 關(guān)閉連接
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();
}
}

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 implements 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;
// 初始化
private 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);
}
// 消費(fèi)消息
public void consumeMessage() throws JMSException, Exception ...{
initialize();
connection.start();
System.out.println("Consumer:->Begin listening...");
// 開始監(jiān)聽
consumer.setMessageListener(this);
// Message message = consumer.receive();
}
// 關(guān)閉連接
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();
}
// 消息處理函數(shù)
public void onMessage(Message 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();
}
}
}

如果想主動(dòng)的去接受消息,而不用消息監(jiān)聽的話,把consumer.setMessageListener(this)改為Message message = consumer.receive(),手動(dòng)去調(diào)用MessageConsumer的receive方法即可。
下面是測(cè)試類Test.java:
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();
// 開始監(jiān)聽
consumer.consumeMessage();
// 延時(shí)500毫秒之后發(fā)送消息
Thread.sleep(500);
producer.produceMessage("Hello, world!");
producer.close();
// 延時(shí)500毫秒之后停止接受消息
Thread.sleep(500);
consumer.close();
}
}
以上就是我學(xué)習(xí)ActiveMQ之后寫的一個(gè)簡(jiǎn)單的例子,希望對(duì)你有幫助,如果有什么錯(cuò)誤還請(qǐng)指正。
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