rabbitmq小记

发topic代码，创建交换器，数据直接按routingKey发送到交换器中，即不需要定义队列：　　　　

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using (var connection = factory.CreateConnection()) {     using (var channel = connection.CreateModel())     {         // 创建交换器         channel.ExchangeDeclare("logs3", ExchangeType.Topic);           // 发送消息         channel.BasicPublish(exchange: "logs3", routingKey: "red.green", basicProperties: null, body: Encoding.UTF8.GetBytes($"测试red.green"));         channel.BasicPublish(exchange: "logs3", routingKey: "red.yellow.green", basicProperties: null, body: Encoding.UTF8.GetBytes($"测试red.yellow.green"));     } }

接收topic，需要定义队列并绑定到交换器，每个队列中的数据只能被一个消费者获取，即使两个消费都同时接收a.#，如果想多个消费者都收到这个消息，则不同消费者需定义不同的队列：

如果使用了不同的队列，要注意是否有消息不被消费的情况，造成消息累积永远没有人消费

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private void button6_Click(object sender, EventArgs e)        {            //接收topic            string qname = Guid.NewGuid().ToString();  //如果多个消费者定义的队列名相同，则只能发到一个消费者            cn接收 = this.factory.CreateConnection();            mod接收 = cn接收.CreateModel();            mod接收.QueueDeclare(qname, false, false, true, null);            mod接收.QueueBind(qname, "logs3", "red.#");            var consumer = new EventingBasicConsumer(mod接收);            mod接收.BasicConsume(qname, true, consumer);                //该事件在接收到消息时触发            consumer.Received += Consumer_Received3;          }          private void Consumer_Received3(object sender, BasicDeliverEventArgs e)        {              byte[] body = e.Body.ToArray();   //消息字节数组            string message = e.RoutingKey + Encoding.UTF8.GetString(body); //消息内容            sb.AppendLine(message);        }

　设置消息超时：

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using (var connection = factory.CreateConnection())           {               using (var channel = connection.CreateModel())               {                   Dictionary<string, object> d = new Dictionary<string, object>();                   d["x-message-ttl"] = 10 * 1000; //10s超时                   string qname = this.txt队列名.Text.Trim();                   channel.QueueDeclare(qname, false, false, true, d);//创建一个名称为hello的消息队列                   var properties = channel.CreateBasicProperties();                     properties.DeliveryMode = 1; //1表示不持久化，2表示持久化（默认）                     properties.Headers = new Dictionary<string, object>();                   properties.Headers["文件名"] = "经.mp4";                   properties.Headers["文件长度"] = "2520";                   string message = qname + DateTime.Now.ToString(); //传递的消息内容                   var body = Encoding.UTF8.GetBytes(message);                   channel.BasicPublish("", qname, properties, body); //开始传递               }           }