关键字:
producertool/customertool ActiveMQ的一个简单示例
关键字:
activemq
最近由于公司项目需要,开始学习JMS,用的是ActiveMQ。由于这方面网上的例子不是很多,而且有的也不完整。于是经过几天的摸索学习,写了一个简单的小例子,现在贴出来与大家分享。
ProducerTool.java用于发送消息:
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);
}
// 发送消息
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!");
}
// 关闭连接
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();
}
}
ConsumerTool.java用于接受消息,我用的是基于消息监听的机制,需要实现MessageListener接口,这个接口有个onMessage方法,当接受到消息的时候会自动调用这个函数对消息进行处理。
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);
}
// 消费消息
public void consumeMessage() throws JMSException, Exception {
initialize();
connection.start();
System.out.println("Consumer:->Begin listening...");
// 开始监听
consumer.setMessageListener(this);
// Message message = consumer.receive();
}
// 关闭连接
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();
}
// 消息处理函数
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();
}
}
}
如果想主动的去接受消息,而不用消息监听的话,把consumer.setMessageListener(this)改为Message message = consumer.receive(),手动去调用MessageConsumer的receive方法即可。
下面是测试类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();
// 开始监听
consumer.consumeMessage();
// 延时500毫秒之后发送消息
Thread.sleep(500);
producer.produceMessage("Hello, world!");
producer.close();
// 延时500毫秒之后停止接受消息
Thread.sleep(500);
consumer.close();
}
}
以上就是我学习ActiveMQ之后写的一个简单的例子,希望对你有帮助,如果有什么错误还请指正。
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