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
1 package com.yzl.test3; 2 3 import java.util.Date; 4 5 import com.google.gson.Gson; 6 import com.rabbitmq.client.Channel; 7 import com.rabbitmq.client.Connection; 8 import com.rabbitmq.client.ConnectionFactory; 9 10 /** 11 * 使用fanout交换器产生事件，消费者订阅事件做相应的处理 12 * @author: yzl 13 * @date: 2016-10-22 14 */ 15 public class SenderWithFanoutExchange { 16 //交换器名称 17 private static final String EXCHANGE_NAME = "myFanoutExchange"; 18 19 public static void main(String[] args) throws Exception { 20 //连接到rabbitmq服务器 21 ConnectionFactory factory = new ConnectionFactory(); 22 factory.setHost("localhost"); 23 Connection connection = factory.newConnection(); 24 //创建一个信道 25 final Channel channel = connection.createChannel(); 26 //定义一个名字为topicExchange的fanout类型的exchange 27 channel.exchangeDeclare(EXCHANGE_NAME, "fanout"); 28 29 //创建一个时间的Event对象 30 EventObj createOrderEvent = null; 31 for(int i=1; i<10; i++){ 32 createOrderEvent = new EventObj(); 33 createOrderEvent.setUserId(Long.valueOf(i)); 34 createOrderEvent.setCreateTime(new Date()); 35 createOrderEvent.setEventType("create_order"); 36 //转成JSON 37 String msg = new Gson().toJson(createOrderEvent); 38 39 System.out.println("send msg:" + msg); 40 41 //使用order_event路由键来发送该事件消息 42 channel.basicPublish(EXCHANGE_NAME, "order_event", null, msg.getBytes()); 43 44 Thread.sleep(1000); 45 } 46 47 channel.close(); 48 connection.close(); 49 } 50 }
消费消费者ReceiverWithFanoutExchange
1 package com.yzl.test3; 2 3 import java.io.IOException; 4 5 import com.rabbitmq.client.Channel; 6 import com.rabbitmq.client.Connection; 7 import com.rabbitmq.client.ConnectionFactory; 8 import com.rabbitmq.client.DefaultConsumer; 9 import com.rabbitmq.client.Envelope; 10 import com.rabbitmq.client.AMQP.BasicProperties; 11 12 /** 13 * 使用fanout交换器接收订单事件消息 14 * 15 * @author: yzl 16 * @date: 2016-10-22 17 */ 18 public class ReceiverWithFanoutExchange { 19 // 交换器名称 20 private static final String EXCHANGE_NAME = "myFanoutExchange"; 21 //接收订单事件并发放积分的队列 22 private static final String QUEUE_ORDER_REWARD_POINTS = "rewardOrderPoints"; 23 //发放订单积分的路由键 24 private static final String ROUTING_KEY_ORDER_POINTS = "reward_order_points"; 25 //接收订单事件并发短信的队列 26 private static final String QUEUE_ORDER_SEND_SMS = "sendOrderSms"; 27 //发送订单短信的路由键 28 private static final String ROUTING_KEY_ORDER_SMS = "send_order_sms"; 29 30 private static Channel channel = null; 31 32 static{ 33 try{ 34 // 连接到rabbitmq服务器 35 ConnectionFactory factory = new ConnectionFactory(); 36 factory.setHost("localhost"); 37 Connection connection = factory.newConnection(); 38 // 创建一个信道 39 channel = connection.createChannel(); 40 // 定义一个名字为myFanoutExchange的fanout类型的exchange 41 channel.exchangeDeclare(EXCHANGE_NAME, "fanout"); 42 }catch (Exception e) { 43 // TODO: handle exception 44 } 45 } 46 47 /** 48 * 发放订单的积分奖励 49 */ 50 public static void rewardPoints() throws Exception { 51 channel.queueDeclare(QUEUE_ORDER_REWARD_POINTS, false, false, false, null); 52 channel.queueBind(QUEUE_ORDER_REWARD_POINTS, EXCHANGE_NAME, ROUTING_KEY_ORDER_POINTS); 53 54 channel.basicConsume(QUEUE_ORDER_REWARD_POINTS, true, new DefaultConsumer(channel){ 55 @Override 56 public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) 57 throws IOException { 58 String msg = new String(body); 59 System.out.println("积分系统接收到订单创建的事件消息 :" + msg); 60 System.out.println("准备发放积分....."); 61 } 62 }); 63 } 64 65 /** 66 * 发送订单成功的短信 67 */ 68 public static void sendSms() throws Exception { 69 channel.queueDeclare(QUEUE_ORDER_SEND_SMS, false, false, false, null); 70 channel.queueBind(QUEUE_ORDER_SEND_SMS, EXCHANGE_NAME, ROUTING_KEY_ORDER_SMS); 71 72 channel.basicConsume(QUEUE_ORDER_REWARD_POINTS, true, new DefaultConsumer(channel){ 73 @Override 74 public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) 75 throws IOException { 76 String msg = new String(body); 77 System.out.println("短信平台接收到订单创建的事件消息 :" + msg); 78 System.out.println("准备发送短信....."); 79 } 80 }); 81 } 82 83 public static void main(String[] args) throws Exception { 84 rewardPoints(); 85 sendSms(); 86 } 87 }
运行结果输出：
1 send msg:{"userId":1,"createTime":"Oct 22, 2016 10:54:04 PM","eventType":"create_order"} 2 send msg:{"userId":2,"createTime":"Oct 22, 2016 10:54:05 PM","eventType":"create_order"} 3 send msg:{"userId":3,"createTime":"Oct 22, 2016 10:54:06 PM","eventType":"create_order"} 4 send msg:{"userId":4,"createTime":"Oct 22, 2016 10:54:07 PM","eventType":"create_order"} 5 send msg:{"userId":5,"createTime":"Oct 22, 2016 10:54:08 PM","eventType":"create_order"} 6 send msg:{"userId":6,"createTime":"Oct 22, 2016 10:54:09 PM","eventType":"create_order"} 7 send msg:{"userId":7,"createTime":"Oct 22, 2016 10:54:10 PM","eventType":"create_order"} 8 send msg:{"userId":8,"createTime":"Oct 22, 2016 10:54:11 PM","eventType":"create_order"} 9 send msg:{"userId":9,"createTime":"Oct 22, 2016 10:54:12 PM","eventType":"create_order"}
1 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"} 2 准备发放积分..... 3 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"} 4 准备发送短信..... 5 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"} 6 准备发放积分..... 7 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"} 8 准备发送短信..... 9 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"} 10 准备发放积分..... 11 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"} 12 准备发送短信..... 13 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"} 14 准备发放积分..... 15 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"} 16 准备发送短信..... 17 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"} 18 准备发放积分.....
原文：http://www.cnblogs.com/yangzhilong/p/5988641.html