scrapy在采集网页时使用随机user-agent的方法

下面是脚本之家 jb51.cc 通过网络收集整理的代码片段。

脚本之家小编现在分享给大家，也给大家做个参考。

DOWNLOADER_MIDDLEWARES = {
        'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware' : None,'Crawler.comm.rotate_useragent.RotateUserAgentMiddleware' :400
    }

#!/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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