rabbitmq 2

生产者代码：

import pika  

connection = pika.BlockingConnection(pika.ConnectionParameters(  
        host='localhost'))  
channel = connection.channel()  

channel.queue_declare(queue='hello')  

channel.basic_publish(exchange='',  
                      routing_key='hello',  
                      body='Hello World!')  
print " [x] Sent 'Hello World!'"  
connection.close() 

消费者代码：

import pika  

connection = pika.BlockingConnection(pika.ConnectionParameters(  
        host='localhost'))  
channel = connection.channel()  

channel.queue_declare(queue='hello')  

print ' [*] Waiting for messages. To exit press CTRL+C'  

def callback(ch, method, properties, body):  
    print " [x] Received %r" % (body,)  

channel.basic_consume(callback,  
                      queue='hello',  
                      no_ack=True)  

channel.start_consuming()

重点
1：producer和consumer都应该去声明一个队列，尽管只有producer才能真正有效的创建。

通过命令rabbitmqctl list_queues可查看当前有哪些queue
当前有new_priority,task_queue,new_task_queue,priority四个queue

**刚刚实验了，如果消费者不声明一个同样的queue居然不报错！以前一直以为会报错！**

2从架构图可以看出，Producer只能发送到exchange，它是不能直接发送到queue的。现在我们使用默认的exchange（名字是空字符）。这个默认的exchange允许我们发送给指定的queue。routing_key就是指定的queue名字。

3

channel.start_consuming()

此处为无线循环监听