ActiveMQ入门实例

  ActiveMQ入门实例

 

在这里利用MQ作为消息中间件来发送点对点(PTP)的文本消息，以便对JMS有入门级的认识，需要下载activemq并进入${active-mq}\bin目录运行activemq.bat。需要activemq-all对应版本的jar和jms.jar。
消息发送方QSender通过键盘输入文本信息来发送消息，接收方QReceiver实现MessageListener接口异步接受消息并打印。代码如下

发送方

import java.io.BufferedReader;
import java.io.InputStreamReader;

import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;


public class QSender
{
public static void main(String[] args)
{
new QSender().send();
}

public void send()
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
try
{
//init connection factory with activemq
QueueConnectionFactory factory=new ActiveMQConnectionFactory("tcp://127.0.0.1:61616");
//specify the destination
Queue queue=new ActiveMQQueue("queue.name.sample");
//create connection,session,producer and deliver message
QueueConnection conn=factory.createQueueConnection();
QueueSession session=conn.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
QueueSender sender=session.createSender(queue);
String msgText=null;
while(true)
{
    System.out.println("enter message to send or 'quit'");
    msgText=br.readLine();
    if("quit".equals(msgText))
   break;
    TextMessage msg=session.createTextMessage(msgText);
    sender.send(msg);
}
System.out.println("exiting..");
//close opened resources
br.close();
conn.close();
}
catch(Exception e)
{
e.printStackTrace();
System.exit(1);
}
}
}


接收方

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;

// implements MessageListener in order to receiving asynchronous message
public class QReceiver implements MessageListener
{
//indicate whether stoping receiving
private boolean stop=false;
public static void main(String[] args)
{
new QReceiver().receive();
}

public void receive()
{
try
{
//the same as QSender
QueueConnection conn=new ActiveMQConnectionFactory("tcp://127.0.0.1:61616").createQueueConnection();
Queue queue=new ActiveMQQueue("queue.name.sample");
QueueSession session=conn.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
QueueReceiver receiver=session.createReceiver(queue);
//Sets the message consumer's MessageListener.
receiver.setMessageListener(this);
//ready to setup consumer,begin to receive message
conn.start();
while(!stop)
{
    Thread.sleep(1000);
}
System.out.println("exiting..");
conn.close();
}
catch(Exception e)
{
e.printStackTrace();
System.exit(1);
}
}
//called while receiving message
@Override
public void onMessage(Message msg)
{
try
{
String text=((TextMessage)msg).getText();
System.out.println(text);
if(text.equals("stop"))
    stop=true;
}
catch(JMSException e)
{
e.printStackTrace();
stop=true;
}