我目前正在学习rabbitmq教程，遇到了一个问题。无论我多么仔细地学习教程，当我试图运行www.example.com和www.example.com时，我总是得到这个错误send.pyreceive.py:

pika.exceptions.ConnectionClosed: Connection to 127.0.0.1:5672 failed: [Errno 61] Connection refused

这是send.py:

#!/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()

这是receive.py:

#!/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()

我一辈子都搞不清楚我到底做错了什么。我看过这里的其他帖子，也问过类似的问题，但还是没有答案。