RabbitMQ：四种ExChange用法

RabbitMQ发送消息时，都是先把消息发送给ExChange（交换机），然后再分发给有相应RoutingKey（路由）关系的Queue（队列）。

ExChange和Queue之前是多对多的关系。

RabbitMQ 3.0之后创建ExChange时，有四种类型可选“fanout、direct、topic、headers”。

一、fanout

当向一个fanout发送一个消息时，RoutingKey的设置不起作用。

消息会被发送给同一个交换机下的所有队列，每个队列接收到的消息是一样的；

一个队列内有所有消费者（包含那些并没有相应RoutingKey的消费者），将平分队列接收到的消息。

----------------消息生产者----------------

ConnectionFactory factory = new ConnectionFactory();

factory.setHost(S_RabbitMQ.QUEUE_IP);// MQ主机

factory.setPort(S_RabbitMQ.QUEUE_PORT);// MQ端口

factory.setUsername(S_RabbitMQ.QUEUE_USER);// MQ用户名

factory.setPassword(S_RabbitMQ.QUEUE_PWD);// MQ密码

Connection connection = factory.newConnection();

Channel channel = connection.createChannel();

// 声明路由名字和类型

channel.exchangeDeclare(EXCHANGE_NAME, "fanout", true, false, null);

String message = "hello world! ";

for(int i=0;i<100;i++)

{

channel.basicPublish(EXCHANGE_NAME, "", null, (message+i).getBytes());

}

System.out.println("Sent msg finish");

channel.close();

connection.close();

----------------消息消费者----------------

ConnectionFactory factory = new ConnectionFactory();

factory.setHost(S_RabbitMQ.QUEUE_IP);// MQ主机

factory.setPort(S_RabbitMQ.QUEUE_PORT);// MQ端口

factory.setUsername(S_RabbitMQ.QUEUE_USER);// MQ用户名

factory.setPassword(S_RabbitMQ.QUEUE_PWD);// MQ密码

Connection connection = factory.newConnection();

Channel channel = connection.createChannel();

//声明路由名字和类型

channel.exchangeDeclare(EXCHANGE_NAME, "fanout", true, false, null);

//声明队列

channel.queueDeclare(QUEUE_NAME, true, false, false, null);

//绑定路由和队列

channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "routkey2", null);

System.out.println(" Waiting for msg....");

Consumer consumer = new DefaultConsumer(channel) {

@Override

public void handleDelivery(String consumerTag, Envelope envelope,  AMQP.BasicProperties properties, byte[] body) {

String message = "";

try

{

message = new String(body, "UTF-8");

}

catch (UnsupportedEncodingException e)

{

e.printStackTrace();

}

catch (Throwable ex)

{

ex.printStackTrace();

}

System.out.println("Received msg='" + message + "'");

}

};

channel.basicConsume(QUEUE_NAME, true, consumer);

二、direct

当向一个direct发送一个消息时，消息会被发送给同一个交换机下的拥有相应RoutingKey的队列，每个队列接收到的消息是一样的；

一个队列内拥有相应RoutingKey的消费者，将平分队列接收到的消息。

----------------消息生产者----------------

ConnectionFactory factory = new ConnectionFactory();

factory.setHost(S_RabbitMQ.QUEUE_IP);// MQ主机

factory.setPort(S_RabbitMQ.QUEUE_PORT);// MQ端口

factory.setUsername(S_RabbitMQ.QUEUE_USER);// MQ用户名

factory.setPassword(S_RabbitMQ.QUEUE_PWD);// MQ密码

Connection connection = factory.newConnection();

Channel channel = connection.createChannel();

// 声明路由名字和类型

channel.exchangeDeclare(EXCHANGE_NAME, "direct", true, false, null);

String message = "hello world! ";

for(int i=0;i<100;i++)

{

channel.basicPublish(EXCHANGE_NAME, "routingkey1", null, (message+i).getBytes());

}

System.out.println("Sent msg is '" + message + "'");

channel.close();

connection.close();

----------------消息消费者----------------

ConnectionFactory factory = new ConnectionFactory();

factory.setHost(S_RabbitMQ.QUEUE_IP);// MQ主机

factory.setPort(S_RabbitMQ.QUEUE_PORT);// MQ端口

factory.setUsername(S_RabbitMQ.QUEUE_USER);// MQ用户名

factory.setPassword(S_RabbitMQ.QUEUE_PWD);// MQ密码

Connection connection = factory.newConnection();

Channel channel = connection.createChannel();

//声明路由名字和类型

channel.exchangeDeclare(EXCHANGE_NAME, "direct", true, false, null);

//声明队列

channel.queueDeclare(QUEUE_NAME, true, false, false, null);

//绑定路由和队列

channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "routingkey1", null);

System.out.println(" Waiting for msg....");

Consumer consumer = new DefaultConsumer(channel)

{

@Override

public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,

byte[] body)

{

String message = "";

try

{

message = new String(body, "UTF-8");

}

catch (UnsupportedEncodingException e)

{

e.printStackTrace();

}

catch (Throwable ex)

{

ex.printStackTrace();

}

System.out.println("1 Received msg='" + message + "'");

}

};

channel.basicConsume(QUEUE_NAME, true, consumer);

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