rabbitmq direct、fanout、topic 三种Exchange java 代码比较
Producer端
1、channel的创建
无论是才用什么样的Exchange,创建channel代码都是相同的,如下
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
2、Exchange的创建
2.1 direct
direct使用默认的Exchange,不需要声明,单需要指定消息发送到那个队列
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
2.2 fanout
channel.exchangeDeclare(EXCHANGE_NAME, "fanout")
2.3 topic如下
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
3、消息的发送
3.1 direct
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
3.2 fanout
channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes());
3.3 topic
channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
cusumer端
1、创建channel
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
2、消息前的准备
2.1 direct直接绑定队列进行消息的消费
chanel.queueDeclare(QUEUE_NAME, false, false, false, null);
2.2 fanout,需要先指定exchange类型为fanout
channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
String queueName = channel.queueDeclare().getQueue();
channel.queueBind(queueName, EXCHANGE_NAME, "");
2.3 topic
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
String queueName = channel.queueDeclare().getQueue();
for(String bindingKey : argv){
channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);
}
3、具体消费消息的代码是一样的
QueueingConsumer consumer = new QueueingConsumer(channel);
channel.basicConsume(QUEUE_NAME, true, consumer);
while (true) {
QueueingConsumer.Delivery delivery = consumer.nextDelivery();
Envelope elp = delivery.getEnvelope();
String message = new String(delivery.getBody());
System.out.println(" [x] Received '" + message + "'");
channel.basicAck(elp.getDeliveryTag(), false);
//channel.basicNack();
}
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