ActiveMQ (二) 使用Queue或者Topic发送/接受消息

ActiveMQ ( ) 使用Queue或者Topic发送/接受消息

本篇主要讲解在未使用其他框架(Spring)整合情况下,独立基于ActiveMQ,使用JMS规范进行消息通信。

.JMS回顾
Java Message Service (JMS)
sun提出来的为J2EE提供企业消息处理的一套规范,JMS目前有2套规范还在使用JMS 1.0.2b1.1. 1.1已经成为主流的JMS Provider事实上的标准了.
1.1
主要在session上面有一些重要改变,比如支持建立同一session上的transaction,让他支持同时发送P2P(Queue)消息和接受
Topic
消息。

JMS中间主要定义了2种消息模式Point-to-Point (点对点), Publich/Subscribe Model (发布/订阅者) 其中在Publich/Subscribe 模式下又有Nondurable subscriptiondurable subscription (持久化订阅)2种消息处理方式。

下面是JMS规范基本的接口和实现
JMS Common Interface PTP-Specific Interface Pub/Sub-specific interfaces
ConnectionFactory QueueConnectionFactory TopicConnectionFactory
Connection QueueConnection TopicConnection
Destination Queue Topic
Session QueueSession TopiSession
MessageProducer QueueSender TopicPublisher
MessageConsumerQueueReceiver/QueueBrwer TopicSubscriber

.使用Queue

  1. 下面以ActiveMQ example的代码为主进行说明

  1. 使用ActiveMQConnectionConnectionFactory 建立连接,注意这里没有用到pool

//建立Connection

  1. protectedConnectioncreateConnection()throwsJMSException,Exception{

  2. ActiveMQConnectionFactoryconnectionFactory=newActiveMQConnectionFactory(user,pwd,url);

  3. Connectionconnection=connectionFactory.createConnection();

  4. if(durable&&clientID!=null){

  5. connection.setClientID(clientID);

  6. }

  7. connection.start();

  8. returnconnection;

  9. }

//建立Session

protectedSessioncreateSession(Connectionconnection)throwsException{

  1. Sessionsession=connection.createSession(transacted,ackMode);

  2. returnsession;

  3. }

2。发送消息的代码
//
建立QueueSession

protectedMessageProducercreateProducer(Sessionsession)throwsJMSException{

  1. Destincationdestination=session.createQueue("queue.hello");

  2. MessageProducerproducer=session.createProducer(destination);

  3. producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

  4. if(timeToLive!=0)

  5. producer.setTimeToLive(timeToLive);

  6. returnproducer;

  7. }

//使用Producer发送消息到Queue
producer.send(message);

3。接受消息,JMS规范里面,你可以使用

  1. QueueReceiver/QueueBrowser直接接受消息,但是更多的情况下我们采用消息通知方式,即实现MessageListener接口

  2. publicvoidonMessage(Messagemessage){

  3. //processmessage

  4. }

  5. //setMessageListner,receivemessage

  6. Destincationdestination=session.createQueue("queue.hello");

  7. consumer=session.createConsumer(destination);

  8. consumer.setMessageListener(this);


以上就是使用jms queue发送接受消息的基本方式


Topic

1. 建立连接

java 代码

  1. protectedConnectioncreateConnection()throwsJMSException,Exception{

  2. ActiveMQConnectionFactoryconnectionFactory=newActiveMQConnectionFactory(user,pwd,url);

  3. Connectionconnection=connectionFactory.createConnection();

  4. //如果你要使用DurableSubScription方式,你必须为connection设置一个ClientID

  5. if(durable&&clientID!=null){

  6. connection.setClientID(clientID);

  7. }

  8. connection.start();

  9. returnconnection;

  10. }

2. 建立Session

java 代码

  1. protectedSessioncreateSession(Connectionconnection)throwsException{

  2. Sessionsession=connection.createSession(transacted,ackMode);

  3. returnsession;

  4. }

创建Producer 发送消息到Topic

//createtopiconsession

  1. topic=session.createTopic("topic.hello");

  2. producer=session.createProducer(topic);

  3. //sendmessage

  4. producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

  5. producer.send(message);

创建Consumer接受消息(基本上和Queue相同)

  1. Destincationdestination=session.createTopic("topic.hello");

  2. MessageConsumerconsumer=session.createConsumer(destination);

  3. consumer.setMessageListener(this);

  4. //如果你使用的是DurableSubscription方式,你必须在建立connection的时候

  5. //设置ClientID,而且建立comsumer的时候使用createDurableSubscriber方法,为他指定一个consumerName

  6. //connection.setClientID(clientId);

  7. //consumer=session.createDurableSubscriber((Topic)destination,consumerName);

:连接ActiveMQ的方式
ActiveMQConnectionFactory
提供了多种连接到Broker的方式activemq.apache.org/uri-protocols.html

常见的有
vm://host:port //vm
tcp://host:port //tcp
ssl://host:port //SSL
stomp://host:port //stomp
协议可以跨语言,目前有很多种stomp client (java,c#,c/c++,ruby,python...);

activemq例子代码发送Message消息

完整的示例程序:

发送TextMessage

public class SendMessage {

private static final String url = "tcp://localhost:61616";;

private static final String QUEUE_NAME = "choice.queue";

protected String expectedBody = "world!";

public void sendMessage() throws JMSException{

Connection connection = null;

try{

ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);

connection = connectionFactory.createConnection();

connection.start();

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

Destination destination = session.createQueue(QUEUE_NAME);

MessageProducer producer = session.createProducer(destination);

TextMessage message = session.createTextMessage(expectedBody);

message.setStringProperty("headname", "remoteB");

producer.send(message);

}catch(Exception e){

e.printStackTrace();

}finally{

connection.close();

}

}

*********************************************************************

发送BytesMessage

public class SendMessage {

private String url = "tcp://localhost:61616";

public void sendMessage() throws JMSException{

ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);

Connection connection = connectionFactory.createConnection();

connection.start();

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

Destination destination = session.createQueue("test.queue");

MessageProducer producer = session.createProducer(destination);

producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

BytesMessage message = session.createBytesMessage();

byte[] content = getFileByte("d://test.jar");

message.writeBytes(content);

try{

producer.send(message);

System.out.println("successful send message");

}catch(Exception e){

e.printStackTrace();

e.getMessage();

}finally{

session.close();

connection.close();

}

}

private byte[] getFileByte(String filename){

byte[] buffer = null;

FileInputStream fin = null;

try {

File file = new File(filename);

fin = new FileInputStream(file);

buffer = new byte[fin.available()];

fin.read(buffer);

} catch

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