IPPool.txt

settings.py:
DOWNLOADER_MIDDLEWARES = {
    'demo.middlewares.MyProxiesSpiderMiddleware':100,
    'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware': None,
}

IPPOOL =[
        {'ipaddr':'http://222.189.190.95:9999'},
        {'ipaddr':'http://123.169.34.249:9999'},
        {'ipaddr':'http://120.83.99.81:9999'},
        {'ipaddr':'http://218.66.253.144:8800'},
        {'ipaddr':'http://121.233.227.32:9999'},
        {'ipaddr':'http://58.253.156.164:9999'},
        {'ipaddr':'http://183.129.207.86:11206'}
        ]



middlewares.py:

from scrapy.contrib.downloadermiddleware.httpproxy import HttpProxyMiddleware
from demo.settings import IPPOOL

class MyProxiesSpiderMiddleware(HttpProxyMiddleware):
    def process_request(self, request, spider):
        thisip=random.choice(IPPOOL)
        request.meta['proxy']=thisip['ipaddr']