标签：操作 创建 cep muse windows 无法 response start xxx
概念：多台机器上可以执行同一个爬虫程序,实现网站数据的爬取
原生的scrapy是不可以实现分布式爬虫, 原因如下：
scrapy-redis组件：专门为scrapy开发的一套组件。 该组件可以让scrapy实现分布式 pip install scrapy-redis
分布式爬取的流程：
ITEM_PIPELINES = { ‘scrapy_redis.pipelines.RedisPipeline‘: 400 } # 使用scrapy-redis组件的去重队列 DUPEFILTER_CLASS = "scrapy_redis.dupefilter.RFPDupeFilter" # 使用scrapy-redis组件自己的调度器 SCHEDULER = "scrapy_redis.scheduler.Scheduler" # 是否允许暂停 SCHEDULER_PERSIST = True
# 如果redis服务器不在本机，则需如下配置 REDIS_HOST = ‘192.168.0.108‘ REDIS_PORT = 6379 REDIS_PARAMS = {"password":123456}
scrapy runspider qiubai
lpush qiubaispider https://www.qiushibaike.com/pic/
class QiubaiSpider(RedisCrawlSpider): name = ‘qiubai‘ # allowed_domains = [‘www.qiushibaike.com/pic‘] # start_urls = [‘http://www.qiushibaike.com/pic/‘] redis_key = ‘qiubaispider‘ # 表示跟start_urls含义一样 link = LinkExtractor(allow=r‘/pic/page/\d+‘) rules = ( Rule(link, callback=‘parse_item‘, follow=True), ) def parse_item(self, response): print(‘开始爬虫‘) div_list = response.xpath(‘//*[@id="content-left"]/div‘) for div in div_list: print(div) img_url = "http://" + div.xpath(‘.//div[@class="thumb"]/a/img/@src‘).extract_first() item = RedisproItem() item[‘img_url‘] = img_url yield item
案例需求：爬取的是基于文字的新闻数据(国内, 国际，军师， 航空)
from scrapy import signals from scrapy.http import HtmlResponse class WanyiproDownloaderMiddleware(object): # Not all methods need to be defined. If a method is not defined, # scrapy acts as if the downloader middleware does not modify the # passed objects. def process_request(self, request, spider): # Called for each request that goes through the downloader # middleware. # Must either: # - return None: continue processing this request # - or return a Response object # - or return a Request object # - or raise IgnoreRequest: process_exception() methods of # installed downloader middleware will be called return None def process_response(self, request, response, spider): # 拦截到响应对象(下载器传递给Spider的响应对象) # request: 响应对象对应的请求对象 # response: 拦截到的响应对象 # spider: 爬虫文件对应的爬虫类的实例 print(request.url + "这是下载中间件") # 响应对象中存储页面数据的篡改 if request.url in [‘http://news.163.com/domestic/‘, ‘http://news.163.com/world/‘, ‘http://war.163.com/‘, ‘http://news.163.com/air/‘]: spider.bro.get(url=request.url) js = ‘window.scrollTo(0,document.body.scrollHeight)‘ spider.bro.execute_script(js) time.sleep(2) # 一定要给与浏览器一定的缓冲加载数据的时间 # 页面数据包含了动态加载出来的新闻数据对应的页面数据 page_text = spider.bro.page_source return HtmlResponse(url=spider.bro.current_url, body=page_text, encoding=‘utf-8‘, request=request) else: return response
from scrapy import signals from scrapy.http import HtmlResponse from scrapy.downloadermiddlewares.useragent import UserAgentMiddleware import random 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, like Gecko) Chrome/19.0.1063.0 Safari/536.3", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/536.3 " "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3", "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/19.0.1062.0 Safari/536.3", "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 " "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 " "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 " "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3", "Mozilla/5.0 (Windows NT 6.2) 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" ] # UA池代码的编写（单独给UA池封装一个下载中间件的一个类） # 导包UserAgentMiddleware类 class RandomUserAgent(UserAgentMiddleware): def process_request(self, request, spider): # 从列表中随机抽选一个ua值 ua = random.choice(user_agent_list) # ua值进行当前拦截到请求的ua的写入操作 request.headers.setdefault(‘User-Agent‘, ua) # 可被选用的代理IP PROXY_http = [ ‘153.180.102.104:80‘, ‘195.208.131.189:56055‘, ] PROXY_https = [ ‘120.83.49.90:9000‘, ‘95.189.112.214:35508‘, ] # 批量对拦截到的请求进行IP更换 class Proxy(object): def process_request(self, request, spider): # 对拦截到请求的url进行判断（协议头到底是http还是https） # request.url返回值：http://www.xxx.com h = request.url.split(‘:‘)[0] # 请求的协议头 if h == ‘https‘: ip = random.choice(PROXY_https) request.meta[‘proxy‘] = ‘https://‘ + ip else: ip = random.choice(PROXY_http) request.meta[‘proxy‘] = ‘http://‘ + ip
REDIS_HOST = ‘192.168.0.108‘ REDIS_PORT = 6379 REDIS_PARAMS = {"password": 123456} # 使用scrapy-redis组件的去重队列 DUPEFILTER_CLASS = "scrapy_redis.dupefilter.RFPDupeFilter" # 使用scrapy-redis组件自己的调度器 SCHEDULER = "scrapy_redis.scheduler.Scheduler" # 是否允许暂停 SCHEDULER_PERSIST = True ITEM_PIPELINES = { ‘scrapy_redis.pipelines.RedisPipeline‘: 400 }
scrapy runspider wangyi.py
lpush wangyi https://news.163.com/
标签：操作 创建 cep muse windows 无法 response start xxx
原文地址：https://www.cnblogs.com/harryblog/p/11376864.html
