RabbitMQ(四) exchange 三种类型 fanout 、direct 、topic

exchange 三种类型
fanout： 广播模式 —>不需要配置routerkey 所有队列都可以接收到信息
topic ： 模糊匹配路由key 的队列 才会接收到数据
direct ： 直连 routerkey需要完全匹配的队列才能接受到数据

fanout广播模式

Channel channel = connection.createChannel();    
channel.exchangeDeclare("exchangeName", "fanout"); //direct fanout topic    
channel.queueDeclare("queueName");    
//这种模式需要提前将Exchange与Queue进行绑定，一个Exchange可以绑定多个Queue，一个Queue可以同多个Exchange进行绑定。
channel.queueBind("queueName", "exchangeName", "routingKey");    
    
channel.queueDeclare("queueName1");    
channel.queueBind("queueName1", "exchangeName", "routingKey1");    
    
byte[] messageBodyBytes = "hello world".getBytes();    
//路由键需要设置为空    
channel.basicPublish("exchangeName", "", MessageProperties.PERSISTENT_TEXT_PLAIN, messageBodyBytes);   

topic 模式

Channel channel = connection.createChannel();    
channel.exchangeDeclare("exchangeName", "topic"); //direct fanout topic    
channel.queueDeclare("queueName");    
channel.queueBind("queueName", "exchangeName", "routingKey.*");    
    
byte[] messageBodyBytes = "hello world".getBytes();    
channel.basicPublish("exchangeName", "routingKey.one", MessageProperties.PERSISTENT_TEXT_PLAIN, messageBodyBytes); 

Direct模式

Channel channel = connection.createChannel();    
channel.exchangeDeclare("exchangeName", "direct"); //direct fanout topic    
channel.queueDeclare("queueName");    
channel.queueBind("queueName", "exchangeName", "routingKey");    
    
byte[] messageBodyBytes = "hello world".getBytes();    
//需要绑定路由键    
channel.basicPublish("exchangeName", "routingKey", MessageProperties.PERSISTENT_TEXT_PLAIN, messageBodyBytes);