RabbitMQ学习笔记4-使用fanout交换器

fanout交换器会把发送给它的所有消息发送给绑定在它上面的队列，起到广播一样的效果。

本里使用实际业务中常见的例子，

订单系统：创建订单，然后发送一个事件消息

积分系统：发送订单的积分奖励

短信平台：发送订单的短信

消息生产者SenderWithFanoutExchange

 package com.yzl.test3;

 import java.util.Date;

 import com.google.gson.Gson;
 import com.rabbitmq.client.Channel;
 import com.rabbitmq.client.Connection;
 import com.rabbitmq.client.ConnectionFactory;

 /**
  *    使用fanout交换器产生事件，消费者订阅事件做相应的处理
  * @author: yzl
  * @date: 2016-10-22
  */
 public class SenderWithFanoutExchange {
     //交换器名称
     private static final String EXCHANGE_NAME = "myFanoutExchange";

     public static void main(String[] args) throws Exception {
         //连接到rabbitmq服务器
         ConnectionFactory factory = new ConnectionFactory();
         factory.setHost("localhost");
         Connection connection = factory.newConnection();
         //创建一个信道
         final Channel channel = connection.createChannel();
         //定义一个名字为topicExchange的fanout类型的exchange
         channel.exchangeDeclare(EXCHANGE_NAME, "fanout");

       //创建一个时间的Event对象
         EventObj createOrderEvent = null;
         for(int i=1; i<10; i++){
             createOrderEvent = new EventObj();
             createOrderEvent.setUserId(Long.valueOf(i));
             createOrderEvent.setCreateTime(new Date());
             createOrderEvent.setEventType("create_order");
             //转成JSON
             String msg = new Gson().toJson(createOrderEvent);

             System.out.println("send msg:" + msg);

             //使用order_event路由键来发送该事件消息
             channel.basicPublish(EXCHANGE_NAME, "order_event", null, msg.getBytes());

             Thread.sleep(1000);
         }

         channel.close();
         connection.close();
     }
 }

消费消费者ReceiverWithFanoutExchange

 package com.yzl.test3;

 import java.io.IOException;

 import com.rabbitmq.client.Channel;
 import com.rabbitmq.client.Connection;
 import com.rabbitmq.client.ConnectionFactory;
 import com.rabbitmq.client.DefaultConsumer;
 import com.rabbitmq.client.Envelope;
 import com.rabbitmq.client.AMQP.BasicProperties;

 /**
  * 使用fanout交换器接收订单事件消息
  *
  * @author: yzl
  * @date: 2016-10-22
  */
 public class ReceiverWithFanoutExchange {
     // 交换器名称
     private static final String EXCHANGE_NAME = "myFanoutExchange";
     //接收订单事件并发放积分的队列
     private static final String QUEUE_ORDER_REWARD_POINTS = "rewardOrderPoints";
     //发放订单积分的路由键
     private static final String ROUTING_KEY_ORDER_POINTS = "reward_order_points";
     //接收订单事件并发短信的队列
     private static final String QUEUE_ORDER_SEND_SMS = "sendOrderSms";
     //发送订单短信的路由键
     private static final String ROUTING_KEY_ORDER_SMS = "send_order_sms";

     private static Channel channel = null;

     static{
         try{
             // 连接到rabbitmq服务器
             ConnectionFactory factory = new ConnectionFactory();
             factory.setHost("localhost");
             Connection connection = factory.newConnection();
             // 创建一个信道
             channel = connection.createChannel();
             // 定义一个名字为myFanoutExchange的fanout类型的exchange
             channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
         }catch (Exception e) {
             // TODO: handle exception
         }
     }

     /**
      * 发放订单的积分奖励
      */
     public static void rewardPoints() throws Exception {
         channel.queueDeclare(QUEUE_ORDER_REWARD_POINTS, false, false, false, null);
         channel.queueBind(QUEUE_ORDER_REWARD_POINTS, EXCHANGE_NAME, ROUTING_KEY_ORDER_POINTS);

         channel.basicConsume(QUEUE_ORDER_REWARD_POINTS, true, new DefaultConsumer(channel){
             @Override
             public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                     throws IOException {
                 String msg = new String(body);
                 System.out.println("积分系统接收到订单创建的事件消息 :" + msg);
                 System.out.println("准备发放积分.....");
             }
         });
     }

     /**
      * 发送订单成功的短信
      */
     public static void sendSms() throws Exception {
         channel.queueDeclare(QUEUE_ORDER_SEND_SMS, false, false, false, null);
         channel.queueBind(QUEUE_ORDER_SEND_SMS, EXCHANGE_NAME, ROUTING_KEY_ORDER_SMS);

         channel.basicConsume(QUEUE_ORDER_REWARD_POINTS, true, new DefaultConsumer(channel){
             @Override
             public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                     throws IOException {
                 String msg = new String(body);
                 System.out.println("短信平台接收到订单创建的事件消息 :" + msg);
                 System.out.println("准备发送短信.....");
             }
         });
     }

     public static void main(String[] args) throws Exception {
         rewardPoints();
         sendSms();
     }
 }

运行结果输出：

 send msg:{"userId":1,"createTime":"Oct 22, 2016 10:54:04 PM","eventType":"create_order"}
 send msg:{"userId":2,"createTime":"Oct 22, 2016 10:54:05 PM","eventType":"create_order"}
 send msg:{"userId":3,"createTime":"Oct 22, 2016 10:54:06 PM","eventType":"create_order"}
 send msg:{"userId":4,"createTime":"Oct 22, 2016 10:54:07 PM","eventType":"create_order"}
 send msg:{"userId":5,"createTime":"Oct 22, 2016 10:54:08 PM","eventType":"create_order"}
 send msg:{"userId":6,"createTime":"Oct 22, 2016 10:54:09 PM","eventType":"create_order"}
 send msg:{"userId":7,"createTime":"Oct 22, 2016 10:54:10 PM","eventType":"create_order"}
 send msg:{"userId":8,"createTime":"Oct 22, 2016 10:54:11 PM","eventType":"create_order"}
 send msg:{"userId":9,"createTime":"Oct 22, 2016 10:54:12 PM","eventType":"create_order"}

 积分系统接收到订单创建的事件消息 :{"userId":1,"createTime":"Oct 22, 2016 10:54:04 PM","eventType":"create_order"}
 准备发放积分.....
 短信平台接收到订单创建的事件消息 :{"userId":2,"createTime":"Oct 22, 2016 10:54:05 PM","eventType":"create_order"}
 准备发送短信.....
 积分系统接收到订单创建的事件消息 :{"userId":3,"createTime":"Oct 22, 2016 10:54:06 PM","eventType":"create_order"}
 准备发放积分.....
 短信平台接收到订单创建的事件消息 :{"userId":4,"createTime":"Oct 22, 2016 10:54:07 PM","eventType":"create_order"}
 准备发送短信.....
 积分系统接收到订单创建的事件消息 :{"userId":5,"createTime":"Oct 22, 2016 10:54:08 PM","eventType":"create_order"}
 准备发放积分.....
 短信平台接收到订单创建的事件消息 :{"userId":6,"createTime":"Oct 22, 2016 10:54:09 PM","eventType":"create_order"}
 准备发送短信.....
 积分系统接收到订单创建的事件消息 :{"userId":7,"createTime":"Oct 22, 2016 10:54:10 PM","eventType":"create_order"}
 准备发放积分.....
 短信平台接收到订单创建的事件消息 :{"userId":8,"createTime":"Oct 22, 2016 10:54:11 PM","eventType":"create_order"}
 准备发送短信.....
 积分系统接收到订单创建的事件消息 :{"userId":9,"createTime":"Oct 22, 2016 10:54:12 PM","eventType":"create_order"}
 准备发放积分.....