RabbitMQ消息队列（一）: 简单队列

1. 示例选用python的pika模块进行测试，需要预先安装pika模块；

https://pypi.python.org/pypi/pika/0.10.0#downloads

上述地址下载源码，加压，执行如下命令安装：

python setup.py build

python setup.py install

2. 简单队列模型中包含一个生产者，一个消息队列，一个消费者，使用默认交换；

3. 测试代码：

send.py--生产者，负责发送消息

#!/usr/bin/env python
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()

reveiver.py--消费者，负责接收消息

#!/usr/bin/env python
import pika

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

channel.queue_declare(queue='hello')

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

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

print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()

上述例子中，send.py只执行一次，发送一条消息，receiver.py循环接收消息，直到发送命令结束接收；

发送消息：

python send.py

接收消息：

python receive.py
 [*] Waiting for messages. To exit press CTRL+C
 [x] Received 'Hello World!'
 [x] Received 'Hello World!'