RabbitMQ 六种基本队列模式 ----- 通配符(Topic)

这是消息模式的最后一种，通配符模式。总算是都写完了，真不容易。在通配符模式下可以按照 * 或者 # 进行匹配

• * 只能替代一个词，例如：*.error.log 或者 *.log
• # 可以替代0个或更多的词，例如：#.log

通配符模式和路由模式代码很像，只需要修改发送方式就可。

使用 Java 来实现发送者和接收者

• 发送者

  private static final String EXCHANGE_NAME = "logs_topic";
  
      public static void main(String[] args) {
          try {
              ConnectionFactory factory = new ConnectionFactory();
              // 设置参数
              factory.setHost("192.168.3.64");
              factory.setPort(5672);
              factory.setVirtualHost("/default_virtual_host");
              factory.setUsername("admin");
              factory.setPassword("admin");
  
              Connection connection = factory.newConnection();
              Channel channel = connection.createChannel();
              // 创建交换机 此处不能用 FANOUT 作为交换机的类型了 ，需要换成 TOPIC
              channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC, true, false, false, null);
              // 声明两个队列
              channel.queueDeclare("log_topic_queue1", false, false, false, null);
              channel.queueDeclare("log_topic_queue2", false, false, false, null);
              // 绑定两个队列 (此处必须要要指定 routingkey)
              // 队列1只接收 *.info
              channel.queueBind("log_topic_queue1", EXCHANGE_NAME, "*.info");
              // 队列2接收所有
              channel.queueBind("log_topic_queue2", EXCHANGE_NAME, "#");
  
  //            String message = "[日志][支付信息][订单号:" + new Date().getTime() + "][支付ID:10]";
              // 由于要使用 routing 模式发送所以就需要执行 routingkey
              channel.basicPublish(EXCHANGE_NAME, "member.comment.info", null, "用户评论了订单：10026".getBytes(StandardCharsets.UTF_8));
              channel.basicPublish(EXCHANGE_NAME, "operate.info", null, "用户操作了一个按钮".getBytes(StandardCharsets.UTF_8));
              // 释放资源
              channel.close();
              connection.close();
          } catch (IOException | TimeoutException e) {
              e.printStackTrace();
          }
      }
  

• 接收者1

  private static final String EXCHANGE_NAME = "logs_topic";
  
      public static void main(String[] args) {
          try {
              ConnectionFactory factory = new ConnectionFactory();
              // 设置参数
              factory.setHost("192.168.3.64");
              factory.setPort(5672);
              factory.setVirtualHost("/default_virtual_host");
              factory.setUsername("admin");
              factory.setPassword("admin");
  
              Connection connection = factory.newConnection();
  
              Channel channel = connection.createChannel();
              channel.exchangeDeclare(EXCHANGE_NAME,
                      BuiltinExchangeType.TOPIC,
                      true,
                      false, false,
                      null);
  
              String queue1Name = "log_topic_queue1";
              DeliverCallback deliverCallback = (consumerTag, delivery) -> {
                  String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
                  System.out.println("Received '" + message + "'");
              };
              channel.basicConsume(queue1Name, true, deliverCallback, consumerTag -> {
              });
          } catch (IOException | TimeoutException e) {
              e.printStackTrace();
          }
  
      }
  

• 接收者2

  private static final String EXCHANGE_NAME = "logs_topic";
  
      public static void main(String[] args) {
          try {
              ConnectionFactory factory = new ConnectionFactory();
              // 设置参数
              factory.setHost("192.168.3.64");
              factory.setPort(5672);
              factory.setVirtualHost("/default_virtual_host");
              factory.setUsername("admin");
              factory.setPassword("admin");
  
              Connection connection = factory.newConnection();
  
              Channel channel = connection.createChannel();
              channel.exchangeDeclare(EXCHANGE_NAME,
                      BuiltinExchangeType.TOPIC,
                      true,
                      false, false,
                      null);
  
              String queue1Name = "log_topic_queue2";
              DeliverCallback deliverCallback = (consumerTag, delivery) -> {
                  String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
                  System.out.println("Received '" + message + "'");
              };
              channel.basicConsume(queue1Name, true, deliverCallback, consumerTag -> {
              });
          } catch (IOException | TimeoutException e) {
              e.printStackTrace();
          }
  
      }