ActiveMQ 持久化Topic
时间 2021-01-04
标签
activemq
持久模式Topic 发送端
public class PersistanceSender {
public static void main(String[] args) throws Exception {
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://127.0.0.1:61616");
Connection connection = connectionFactory.createConnection();
Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
Destination destination = session.createTopic("Mytopic");
MessageProducer producer = session.createProducer(destination);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);//设置传送模式为持久模式,默认为非持久 connection.start();
for(int i=0; i<3; i++) {
TextMessage message = session.createTextMessage("message--"+i);
Thread.sleep(1000);
//通过消息生产者发出消息 producer.send(message);
}
session.commit();
session.close();
connection.close();
}
}
1:要用持久化订阅,发送消息者要用 DeliveryMode.PERSISTENT 模式发现,在连接之前设定
2:一定要设置完成后,再start 这个 connection
持久化模式Topic 接收端
public class PersistanceReceiver {
public static void main(String[] args) throws Exception {
ConnectionFactory cf = new ActiveMQConnectionFactory("tcp://127.0.0.1:61616");
Connection connection = cf.createConnection();
connection.setClientID("cc1");//设置ClientID final Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
Topic destination = session.createTopic("Mytopic");
//创建持久化用户 TopicSubscriber consumer = session.createDurableSubscriber(destination,"T1");
connection.start();
Message message = consumer.receive();
while(message!=null) {
TextMessage txtMsg = (TextMessage)message;
System.out.println("收到消 息:" + txtMsg.getText());
message = consumer.receive(1000L);
}
session.close();
connection.close();
}
}
1:需要在连接上设置消费者id,用来识别消费者
2:需要创建TopicSubscriber来订阅
3:要设置好了过后再start 这个 connection
4:一定要先运行一次,等于向消息服务中间件注册这个消费者,然后再运行客户端发送信息,这个时候,
无论消费者是否在线,都会接收到,不在线的话,下次连接的时候,会把没有收过的消息都接收下来。
注册消费者成功之后,在ActiveMQ后台可看到
当cc1用户不在线时,发送端发送topic,之后当cc1用户登录时,可接受到之前发送端发送的内容