路由模式下,生产者发送消息时需要指定一个路由键(routingKey),交换机只会把消息转发给包含该路由键的队列
这里,我们改变一下声明交换机的方式.
我们通过管理后台添加一个交换机.
添加后,生产者和消费者的代码中就不需要再声明交换机了.同样,也可以通过管理后台添加队列,那么代码中也不需要声明队列了.
生产者
public class Producer
{ private const string ExchangeName = "test_exchange_direct"; public static void Send()
{
IConnection connection = ConnectionHelper.GetConnection();
IModel channel = connection.CreateModel();
string msg = "hello world "; //把消息发送到交换机,交换机再转发到包含路由键"refuge"的队列.
channel.BasicPublish(ExchangeName, "refuge", null, Encoding.Default.GetBytes(msg));
Console.WriteLine($"send {msg}"); channel.Close();
connection.Close();
}
}
消费者1
public class Consumer1
{
private const string QueueName = "test_exchange1_queue";
private const string ExchangeName = "test_exchange_direct"; public static void Receive()
{
//获取连接
RabbitMQ.Client.IConnection connection = ConnectionHelper.GetConnection(); //创建通道
RabbitMQ.Client.IModel channel = connection.CreateModel(); //声明队列
channel.QueueDeclare(QueueName, false, false, false, null); //声明交换机
//channel.ExchangeDeclare(ExchangeName, "direct", false, false, null); //将队列绑定到交换机上,路由键为"wjire"
channel.QueueBind(QueueName, ExchangeName, "wjire", null); //添加消费者
EventingBasicConsumer consumer = new EventingBasicConsumer(channel); //注册事件
consumer.Received += (s, e) =>
{
byte[] bytes = e.Body;
string str = Encoding.Default.GetString(bytes);
Console.WriteLine("consumer1 : " + str);
}; //监听队列
channel.BasicConsume(QueueName, true, "", false, false, null, consumer);
}
}
消费者2
public class Consumer2
{
private const string QueueName = "test_exchange2_queue";
private const string ExchangeName = "test_exchange_direct";
public static void Receive()
{
//获取连接
RabbitMQ.Client.IConnection connection = ConnectionHelper.GetConnection(); //创建通道
RabbitMQ.Client.IModel channel = connection.CreateModel(); //声明队列
channel.QueueDeclare(QueueName, false, false, false, null); //声明交换机
//channel.ExchangeDeclare(ExchangeName, "direct", false, false, null); //将队列绑定到交换机上,该队列匹配两个路由键,"refuge"和"wjire"
channel.QueueBind(QueueName, ExchangeName, "refuge", null);
channel.QueueBind(QueueName, ExchangeName, "wjire", null); //添加消费者
EventingBasicConsumer consumer = new EventingBasicConsumer(channel); //注册事件
consumer.Received += (s, e) =>
{
byte[] bytes = e.Body;
string str = Encoding.Default.GetString(bytes);
Console.WriteLine(" consumer2 : " + str);
}; //监听队列
channel.BasicConsume(QueueName, true, "", false, false, null, consumer);
}
}
运行结果:
可以看到,只有消费者2消费了消息.