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RabbitMQ 共提供了7种⼯作模式, 进⾏消息传递

一. Simple(简单模式)

P: ⽣产者, 也就是要发送消息的程序
C: 消费者,消息的接收者
Queue: 消息队列, 类似⼀个邮箱, 可以缓存消息; ⽣产者向其中投递消息, 消费者从其中取出消息.

特点: ⼀个⽣产者P，⼀个消费者C, 消息只能被消费⼀次. 也称为点对点(Point-to-Point)模式
适⽤场景: 消息只能被单个消费者处理

公共代码:

public class Common {public static final String HOST = "139.9.84.204";public static final Integer PORT = 5672;public static final String VIRTUALHOST = "study";public static final String USERNAME = "admin";public static final String PASSWORD = "admin";//简单模式public static final String simpleQueue = "simpleQueue";public static final String simpleMsg = "hello, simple.....";}

生产者:

public class ProducerDemo {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//声明队列//如果没有一个这样的队列, 会自动创建, 如果有, 则不创建channel.queueDeclare(Common.simpleQueue, true, false, false, null);for (int i = 0; i < 10; i++) {//发送消息String msg = Common.simpleMsg + i;channel.basicPublish("", Common.simpleQueue, null, msg.getBytes(StandardCharsets.UTF_8));}//释放资源channel.close();connection.close();}
}

消费者:

public class ConsumerDemo {public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();Channel channel = connection.createChannel();//声明队列channel.queueDeclare(Common.simpleQueue, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("获取到队列: " + new String(body));}};//消费消息channel.basicConsume(Common.simpleQueue, true, consumer);Thread.sleep(2000);//释放资源channel.close();connection.close();}
}

二. Work Queue(工作队列模式)

⼀个⽣产者P，多个消费者C1,C2. 在多个消息的情况下, Work Queue 会将消息分派给不同的消费者, 每个消费者都会接收到不同的消息.
特点: 消息不会重复, 分配给不同的消费者.
适⽤场景: 集群环境中做异步处理

公共代码:

  //工作队列模式public static final String workQueue = "workQueue";public static final String workQueueMsg = "hello, workQueue.....";

生产者:

public class Producer {public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost(Common.HOST);factory.setPort(Common.PORT);factory.setVirtualHost(Common.VIRTUALHOST);factory.setUsername(Common.USERNAME);factory.setPassword(Common.PASSWORD);Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(Common.workQueue, true, false, false, null);for(int i = 0; i < 10; i++){String msg = Common.simpleMsg + i;channel.basicPublish("", Common.workQueue, null, msg.getBytes(StandardCharsets.UTF_8));}channel.close();connection.close();}
}

消费者1, 消费者2(代码相同):

public class Consumer1 {public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost(Common.HOST);factory.setPort(Common.PORT);factory.setVirtualHost(Common.VIRTUALHOST);factory.setUsername(Common.USERNAME);factory.setPassword(Common.PASSWORD);Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(Common.workQueue, true, false, false, null);DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.workQueue, true, consumer);
//        channel.close();
//        connection.close();}
}

先启动两个消费者, 再启动生产者:

三. Publish/Subscribe(发布/订阅模式)

图中X表⽰交换机, 在订阅模型中，多了⼀个Exchange角色, 过程略有变化
⼀个⽣产者P, 多个消费者C1, C2, X代表交换机消息复制多份，每个消费者接收相同的消息
⽣产者发送⼀条消息，经过交换机转发到多个不同的队列，多个不同的队列就有多个不同的消费者
适合场景: 消息需要被多个消费者同时接收的场景. 如: 实时通知或者⼴播消息

概念介绍
Exchange: 交换机 (X).
作⽤: ⽣产者将消息发送到Exchange, 由交换机将消息按⼀定规则路由到⼀个或多个队列中(上图中⽣产者将消息投递到队列中, 实际上这个在RabbitMQ中不会发⽣. )
RabbitMQ交换机有四种类型: fanout,direct, topic, headers, 不同类型有着不同的路由策略. AMQP协议⾥还有另外两种类型, System和⾃定义, 此处不再描述.

1. Fanout:⼴播，将消息交给所有绑定到交换机的队列(Publish/Subscribe模式)
2. Direct:定向，把消息交给符合指定routing key的队列(Routing模式)
3. Topic:通配符，把消息交给符合routing pattern(路由模式)的队列(Topics模式)
4. headers类型的交换器不依赖于路由键的匹配规则来路由消息, ⽽是根据发送的消息内容中的headers属性进⾏匹配. headers类型的交换器性能会很差,⽽且也不实⽤,基本上不会看到它的存在.

Exchange(交换机）只负责转发消息, 不具备存储消息的能⼒, 因此如果没有任何队列与Exchange绑定，或者没有符合路由规则的队列，那么消息就会丢失
RoutingKey: 路由键.⽣产者将消息发给交换器时, 指定的⼀个字符串, ⽤来告诉交换机应该如何处理这个消息.
Binding Key:绑定. RabbitMQ中通过Binding(绑定)将交换器与队列关联起来, 在绑定的时候⼀般会指定⼀个Binding Key, 这样RabbitMQ就知道如何正确地将消息路由到队列了.

公共代码:

   //发布订阅模式public static final String FANOUT_EXCHANGE = "fanoutExchange";public static final String FANOUT_QUEUE1 = "fanoutQueue1";public static final String FANOUT_QUEUE2 = "fanoutQueue2";

生产者:

创建交换机:

		//创建交换机channel.exchangeDeclare(Common.FANOUT_EXCHANGE, BuiltinExchangeType.FANOUT, true, false, false, null);

参数解释:

• exchange: 交换机名称
• type: 交换机类型
• durable: 是否持久化
• autoDelete: 自动删除, ⾃动删除的前提是⾄少有⼀个队列或者交换器与这个交换器绑定, 之后所有与这个交换器绑定的队列或者交换器都与此解绑
• internal: 一般为false, 如果设置为true, 表⽰内部使⽤, 客⼾端程序⽆法直接发送消息到这个交换器中,只能通过交换器路由到交换器这种⽅式
• arguments: 参数
  创建队列:

	   //创建队列channel.queueDeclare(Common.FANOUT_QUEUE1, true, false, false, null);channel.queueDeclare(Common.FANOUT_QUEUE2, true, false, false, null);

绑定交换机和队列:

    //绑定交换机和队列channel.queueBind(Common.FANOUT_QUEUE1, Common.FANOUT_EXCHANGE, "");channel.queueBind(Common.FANOUT_QUEUE2, Common.FANOUT_EXCHANGE, "");

参数说明:

• queue: 队列名
• exchange: 交换机名
• routingKey: 路由key, 路由规则, 如果交换机类型为fanout,routingkey设置为"",表⽰每个消费者都可以收到全部信息
  发送消息:

		 //发送消息String msg = "hello, fanout......";channel.basicPublish(Common.FANOUT_EXCHANGE, "", null, msg.getBytes(StandardCharsets.UTF_8));

完整代码:

public class Producer {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建交换机channel.exchangeDeclare(Common.FANOUT_EXCHANGE, BuiltinExchangeType.FANOUT, true, false, false, null);//创建队列channel.queueDeclare(Common.FANOUT_QUEUE1, true, false, false, null);channel.queueDeclare(Common.FANOUT_QUEUE2, true, false, false, null);//绑定交换机和队列channel.queueBind(Common.FANOUT_QUEUE1, Common.FANOUT_EXCHANGE, "");channel.queueBind(Common.FANOUT_QUEUE2, Common.FANOUT_EXCHANGE, "");//发送消息String msg = "hello, fanout......";channel.basicPublish(Common.FANOUT_EXCHANGE, "", null, msg.getBytes(StandardCharsets.UTF_8));}
}

消费者:

public class Consumer1 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.FANOUT_QUEUE1, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.FANOUT_QUEUE1, true, consumer);}
}
public class Consumer2 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.FANOUT_QUEUE2, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.FANOUT_QUEUE2, true, consumer);}
}

四. Routing(路由模式)

路由模式是发布订阅模式的变种, 在发布订阅基础上, 增加路由key
发布订阅模式是⽆条件的将所有消息分发给所有消费者, 路由模式是Exchange根据RoutingKey的规则, 将数据筛选后发给对应的消费者队列
适合场景: 需要根据特定规则分发消息的场景

公共代码:

 //路由模式public static final String DIRECT_EXCHANGE = "directExchange";public static final String DIRECT_QUEUE1 = "directQueue1";public static final String DIRECT_QUEUE2 = "directQueue2";

生产者:

public class Producer {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建交换机channel.exchangeDeclare(Common.DIRECT_EXCHANGE, BuiltinExchangeType.DIRECT, true, false, false, null);//创建队列channel.queueDeclare(Common.DIRECT_QUEUE1, true, false, false, null);channel.queueDeclare(Common.DIRECT_QUEUE2, true, false, false, null);//绑定交换机和队列channel.queueBind(Common.DIRECT_QUEUE1, Common.DIRECT_EXCHANGE, "a");channel.queueBind(Common.DIRECT_QUEUE2, Common.DIRECT_EXCHANGE, "a");channel.queueBind(Common.DIRECT_QUEUE2, Common.DIRECT_EXCHANGE, "b");channel.queueBind(Common.DIRECT_QUEUE2, Common.DIRECT_EXCHANGE, "c");//发送消息String msg1 = "hello, direct a......";channel.basicPublish(Common.DIRECT_EXCHANGE, "a", null, msg1.getBytes(StandardCharsets.UTF_8));String msg2 = "hello, direct b......";channel.basicPublish(Common.DIRECT_EXCHANGE, "b", null, msg2.getBytes(StandardCharsets.UTF_8));String msg3 = "hello, direct c......";channel.basicPublish(Common.DIRECT_EXCHANGE, "c", null, msg3.getBytes(StandardCharsets.UTF_8));}
}

消费者:

public class Consumer1 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.DIRECT_QUEUE1, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.DIRECT_QUEUE1, true, consumer);}
}
public class Consumer2 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.DIRECT_QUEUE2, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.DIRECT_QUEUE2, true, consumer);}
}

五. Topics(通配符模式)

路由模式的升级版, 在routingKey的基础上,增加了通配符的功能, 使之更加灵活.
Topics和Routing的基本原理相同，即：⽣产者将消息发给交换机，交换机根据RoutingKey将消息转发给与RoutingKey匹配的队列. 类似于正则表达式的⽅式来定义Routingkey的模式.
不同之处是：routingKey的匹配⽅式不同，Routing模式是相等匹配，topics模式是通配符匹配.

适合场景: 需要灵活匹配和过滤消息的场景

公共代码:

  //路由模式public static final String TOPIC_EXCHANGE = "topicExchange";public static final String TOPIC_QUEUE1 = "topicQueue1";public static final String TOPIC_QUEUE2 = "topicQueue2";

生产者:

public class Producer {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建交换机channel.exchangeDeclare(Common.TOPIC_EXCHANGE, BuiltinExchangeType.TOPIC, true, false, false, null);//创建队列channel.queueDeclare(Common.TOPIC_QUEUE1, true, false, false, null);channel.queueDeclare(Common.TOPIC_QUEUE2, true, false, false, null);//绑定交换机和队列channel.queueBind(Common.TOPIC_QUEUE1, Common.TOPIC_EXCHANGE, "*.a.*");channel.queueBind(Common.TOPIC_QUEUE2, Common.TOPIC_EXCHANGE, "*.*.b");channel.queueBind(Common.TOPIC_QUEUE2, Common.TOPIC_EXCHANGE, "c.#");//发送消息String msg1 = "hello, direct hello.a.b......";channel.basicPublish(Common.TOPIC_EXCHANGE, "hello.a.b", null, msg1.getBytes(StandardCharsets.UTF_8));//匹配队列1,2String msg2 = "hello, direct hello.world.b......";channel.basicPublish(Common.TOPIC_EXCHANGE, "hello.world.b", null, msg2.getBytes(StandardCharsets.UTF_8));//匹配队列2String msg3 = "hello, direct c.hello.b......";channel.basicPublish(Common.TOPIC_EXCHANGE, "c.hello.b", null, msg3.getBytes(StandardCharsets.UTF_8));//匹配队列2}
}

消费者:

public class Consumer1 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.TOPIC_QUEUE1, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.TOPIC_QUEUE1, true, consumer);}
}
public class Consumer2 {public static void main(String[] args) throws IOException, TimeoutException {//1. 创建连接工厂ConnectionFactory factory = new ConnectionFactory();//2. 设置参数factory.setHost(Common.HOST);//ipfactory.setPort(Common.PORT);//端口号factory.setVirtualHost(Common.VIRTUALHOST);//虚拟机名称factory.setUsername(Common.USERNAME);//用户名factory.setPassword(Common.PASSWORD);//密码//3. 创建连接connectionConnection connection = factory.newConnection();//创建channelChannel channel = connection.createChannel();//创建队列channel.queueDeclare(Common.TOPIC_QUEUE2, true, false, false, null);//消费消息DefaultConsumer consumer = new DefaultConsumer(channel){@Overridepublic void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {System.out.println("接收到消息: " + new String(body));}};channel.basicConsume(Common.TOPIC_QUEUE2, true, consumer);}
}