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参考:http://scrapy-chs.readthedocs.io/zh_CN/0.24/topics/downloader-middleware.html#id2
1、settings.py中添加下载中间件
DOWNLOADER_MIDDLEWARES = {
'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': 125,
'lianjia.middlewares.UAPOOLS': 126,
}
2、middlewares.py中添加代码
from scrapy import signals
import random
from scrapy.downloadermiddlewares.useragent import UserAgentMiddleware
class UAPOOLS(UserAgentMiddleware):
def __init__(self, user_agent=''):
self.user_agent = user_agent
def process_request(self, request, spider):
'''使用代理UA,随机选用'''
ua = random.choice(self.user_agent_pools)
print('当前使用的user-agent是' + ua)
request.headers.setdefault('User-Agent', ua)
user_agent_pools = [
'Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3',
'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36',
]