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);
展开全文