EXCHANGE中TOPIC的使用

1、exchange [topic]
1）direct 提前预知性的binding info、error、debug、warnning=》exchange
2）fanout 群发性的binding
3）headers and、or性质的binding x-match
4）topic 归类性的binding【带有正则效果】
queue1 *.com
queue2 *.cn
queue3 *.net

符号：

*：匹配一个或多个词

#：匹配一个词

2、代码实现

1）生产者

            //基础配置
            ConnectionFactory factory = new ConnectionFactory()
            {
                HostName = "10.123.44.12",
                UserName = "datamip",
                Password = "datamip"
            };

            //第一步：创建connection
            using (var connection = factory.CreateConnection())
            {
                //第二步：创建channel
                using (var channel = connection.CreateModel())
                {
                    //第三步：创建exchange
                    //channel.ExchangeDeclare("myfanoutexchange", ExchangeType.Fanout, true, false, null);
                    //第四步：发布消息
                    for (int i = 0; i < 100; i++)
                    {
                        var msg = Encoding.UTF8.GetBytes(string.Format("{0}:{1}", i, "你好"));
                        var routingkey = i % 13 == 0 ? "呵呵.com" : "哈哈.cn";
                        channel.BasicPublish("mytopicexchange", routingkey, null, body: msg);
                        Console.WriteLine(i);
                    }

                }
            }
            Console.WriteLine("生产成功!");
            Console.ReadKey();

生产者产生的routing会根据消费者队列绑定的routingkey对应关系去进入不同的队列

2）消费者

i)

            //创建连接工厂
            ConnectionFactory factory = new ConnectionFactory
            {
                UserName = "datamip",//用户名
                Password = "datamip",//密码
                HostName = "10.123.44.12"//rabbitmq ip
            };
            //第一步：创建connection
            using (var connection = factory.CreateConnection())
            {
                //第二步：创建channel
                using (var channel = connection.CreateModel())
                {
                    //第三步：生明交换机
                    channel.ExchangeDeclare("mytopicexchange", ExchangeType.Topic, true, false, null);

                    //第四步：声明队列,绑定交换机
                    channel.QueueDeclare("mytopicqueue1", true, false, false, null);
                    channel.QueueBind("mytopicqueue1", "mytopicexchange","*.com",null);

                    //处理消息
                    EventingBasicConsumer consumer = new EventingBasicConsumer(channel);
                    consumer.Received += (sender, e) => {
                        var msg = Encoding.UTF8.GetString(e.Body.ToArray());
                        Console.WriteLine(msg);
                    };
                    //消费
                    channel.BasicConsume("mytopicqueue1", true, consumer);
                    Console.ReadKey();
                }
            }

　　

ii)

            //创建连接工厂
            ConnectionFactory factory = new ConnectionFactory
            {
                UserName = "datamip",//用户名
                Password = "datamip",//密码
                HostName = "10.123.44.12"//rabbitmq ip
            };
            //第一步：创建connection
            using (var connection = factory.CreateConnection())
            {
                //第二步：创建channel
                using (var channel = connection.CreateModel())
                {
                    //第三步：生明交换机
                    channel.ExchangeDeclare("mytopicexchange", ExchangeType.Topic, true, false, null);

                    //第四步：声明队列,绑定交换机
                    channel.QueueDeclare("mytopicqueue2", true, false, false, null);
                    channel.QueueBind("mytopicqueue2", "mytopicexchange","*.cn",null);

                    //处理消息
                    EventingBasicConsumer consumer = new EventingBasicConsumer(channel);
                    consumer.Received += (sender, e) =>
                    {
                        var msg = Encoding.UTF8.GetString(e.Body.ToArray());
                        Console.WriteLine(msg);
                    };
                    //消费
                    channel.BasicConsume("mytopicqueue2", true, consumer);
                    Console.ReadKey();
                }
            }

　iii)效果图

3、图形解释

当前的图形解释有些问题，应该是会有不同的routingkey，routingkey会自动匹配，而不是视频中的直接判断，然后赋值*.com和*.cn，这样的话不需要topic交换机，也可以实现的（个人观点）。

因此代码进行了调整，示意图还是有点问题，自己理解下。