The difference between the sender in rabbitmq+JAVA

sender

method one:

    //create hello queue  

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        //Send message  

        channel.basicPublish("", QUEUE_NAME, null, msg.getBytes()); 

Method two:

 //创建hello队列  
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);  
        channel.exchangeDeclare(EXCHANGE_NAME, "direct",true);
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, KEY_NAME);
        //发送消息 
        channel.basicPublish(EXCHANGE_NAME, KEY_NAME, null, msg.getBytes()); 

Receiving end:

channel.queueDeclare(QUEUE_NAME, false, false, false, null);  
        channel.exchangeDeclare(EXCHANGE_NAME, "direct",true);
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, KEY_NAME);
channel.basicConsume(QUEUE_NAME, true, consumer);

Reference: https://blog.csdn.net/phantomes/article/details/47284829