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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