Routing之订阅模型-Direct(直连)
在Fanout模式中,一条消息会被所有订阅的队列都消费。但是,在某些场景下,我们希望不同的消息被不同的队列消费。这时就要用到Direct的Exchange。
在Direct模型下:
- 队列与交换机的绑定,不能是任意绑定了,而是要指定一个RoutingKey(路由key)
- 消息的发送在向Exchange发送消息时,也必须指定消息的RoutingKey
- Exchange不再把消息交给每一个绑定的队列,而是根据消息的RoutingKey进行判断,只有队列的RoutingKey与消息的RoutingKey完全一致,才会接收到消息
Provider
public class Provider {
public static void main(String[] args) throws IOException {
//获取连接对象
Connection connection = RabbitMqUtils.getConnection();
//获取连接通道对象
Channel channel = connection.createChannel();
//通过通道声明我们的交换机
//参数1:交换机名称
//参数2:direct 路由模式
channel.exchangeDeclare("logs_direct","direct");
//发送消息
String routingkey = "info";
channel.basicPublish("logs_direct",routingkey,null,
("这个时direct模型发布的基于route key:["+routingkey+"] 发送的消息").getBytes());
//关闭连接
RabbitMqUtils.closeConnectionAndChannel(channel,connection);
}
}
Consumer1
public class Consumer1 {
public static void main(String[] args) throws IOException {
//创建连接对象
Connection connection = RabbitMqUtils.getConnection();
//创建连接通道
Channel channel = connection.createChannel();
//定义交换机名称
String exchangeName = "logs_direct";
//通道声明交换机以及交换机的类型
channel.exchangeDeclare(exchangeName, "direct");
//创建一个临时队列
String queue = channel.queueDeclare().getQueue();
//基于route key 绑定队列和交换机
channel.queueBind(queue, exchangeName, "error");
//获取消费的消息
channel.basicConsume(queue, true, new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
byte[] body) {
System.out.println("消费者1:" + new String(body));
}
});
//关闭资源
RabbitMqUtils.closeConnectionAndChannel(channel,connection);
}
}
Consumer2
public class Consumer2 {
public static void main(String[] args) throws IOException {
Connection connection = RabbitMqUtils.getConnection();
Channel channel = connection.createChannel();
//定义交换机名称
String exchangeName = "logs_direct";
//声明交换机以及交换机类型
channel.exchangeDeclare(exchangeName, "direct");
//创建临时队列
String queue = channel.queueDeclare().getQueue();
//临时队列和交换机绑定
channel.queueBind(queue, exchangeName, "info");
channel.queueBind(queue, exchangeName, "error");
channel.queueBind(queue, exchangeName, "warning");
//消费消息
channel.basicConsume(queue, true, new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
byte[] body) throws IOException {
System.out.println("消费者2:" + new String(body));
}
});
}
}