scrapy动态设置user agent,使用IP地址池,禁用cookies,设置下载延迟.

来源：互联网发布：最靠谱的网络兼职编辑：程序博客网时间：2024/06/04 19:50

转自:http://www.cnblogs.com/rwxwsblog/p/4575894.html

1、创建middlewares.py

scrapy代理IP、user agent的切换都是通过DOWNLOADER_MIDDLEWARES进行控制，下面我们创建middlewares.py文件。

import randomimport base64from settings import PROXIESclass RandomUserAgent(object):"""Randomly rotate user agents based on a list of predefined ones"""def __init__(self, agents):self.agents = agents@classmethoddef from_crawler(cls, crawler):return cls(crawler.settings.getlist('USER_AGENTS'))def process_request(self, request, spider):#print "**************************" + random.choice(self.agents)request.headers.setdefault('User-Agent', random.choice(self.agents))class ProxyMiddleware(object):def process_request(self, request, spider):proxy = random.choice(PROXIES)if proxy['user_pass'] is not None:request.meta['proxy'] = "http://%s" % proxy['ip_port']encoded_user_pass = base64.encodestring(proxy['user_pass'])request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_passprint "**************ProxyMiddleware have pass************" + proxy['ip_port']else:print "**************ProxyMiddleware no pass************" + proxy['ip_port']request.meta['proxy'] = "http://%s" % proxy['ip_port']

类RandomUserAgent主要用来动态获取user agent，user agent列表USER_AGENTS在settings.py中进行配置。

类ProxyMiddleware用来切换代理，proxy列表PROXIES也是在settings.py中进行配置。

2、修改settings.py配置USER_AGENTS和PROXIES

a)：添加USER_AGENTS

USER_AGENTS = ["Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)","Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)","Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)","Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)","Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)","Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)","Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6","Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0","Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5","Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20","Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52",]

b)：添加代理IP设置PROXIES

PROXIES = [{'ip_port': '111.11.228.75:80', 'user_pass': ''},{'ip_port': '120.198.243.22:80', 'user_pass': ''},{'ip_port': '111.8.60.9:8123', 'user_pass': ''},{'ip_port': '101.71.27.120:80', 'user_pass': ''},{'ip_port': '122.96.59.104:80', 'user_pass': ''},{'ip_port': '122.224.249.122:8088', 'user_pass': ''},]

代理IP可以网上搜索一下，上面的代理IP获取自：http://www.xici.net.co/。

c)：禁用cookies

COOKIES_ENABLED=False

d)：设置下载延迟

DOWNLOAD_DELAY=3

保存settings.py

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