scrapy在采集网页时使用随机user-agent的方法
发布时间：2020-12-17 17:20:37 所属栏目：Python 来源：网络整理
导读：今天PHP站长网 52php.cn把收集自互联网的代码分享给大家，仅供参考。 DOWNLOADER_MIDDLEWARES = { 'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware' : None,'Crawler.comm.rotate_useragent.RotateU
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以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家，仅供参考 DOWNLOADER_MIDDLEWARES = {
'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware' : None,'Crawler.comm.rotate_useragent.RotateUserAgentMiddleware' :400
}
注意:?Crawler?是你项目的名字?，通过它是一个目录的名称 下面是蜘蛛的代码 #!/usr/bin/python
#-*-coding:utf-8-*-
import random
from scrapy.contrib.downloadermiddleware.useragent import UserAgentMiddleware
class RotateUserAgentMiddleware(UserAgentMiddleware):
def __init__(self,user_agent=''):
self.user_agent = user_agent
def process_request(self,request,spider):
#这句话用于随机选择user-agent
ua = random.choice(self.user_agent_list)
if ua:
request.headers.setdefault('User-Agent',ua)
#the default user_agent_list composes chrome,I E,firefox,Mozilla,opera,netscape
#for more user agent strings,you can find it in http://www.useragentstring.com/pages/useragentstring.php
user_agent_list = [
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML,like Gecko) Chrome/22.0.1207.1 Safari/537.1"
"Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML,like Gecko) Chrome/20.0.1132.57 Safari/536.11",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.6 (KHTML,like Gecko) Chrome/20.0.1092.0 Safari/536.6",
"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6 (KHTML,like Gecko) Chrome/20.0.1090.0 Safari/536.6",
"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.1 (KHTML,like Gecko) Chrome/19.77.34.5 Safari/537.1",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML,like Gecko) Chrome/19.0.1084.9 Safari/536.5",
"Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 (KHTML,like Gecko) Chrome/19.0.1084.36 Safari/536.5",
"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 5.1) AppleWebKit/536.3 (KHTML,
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/536.3 (KHTML,
"Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML,like Gecko) Chrome/19.0.1062.0 Safari/536.3",like Gecko) Chrome/19.0.1061.1 Safari/536.3",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 (KHTML,like Gecko) Chrome/19.0.1061.0 Safari/536.3",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 (KHTML,like Gecko) Chrome/19.0.1055.1 Safari/535.24",
"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/535.24 (KHTML,like Gecko) Chrome/19.0.1055.1 Safari/535.24"
]
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