scrapy-splash抓取动态数据例子十四
一、介绍
本例子用scrapy-splash爬取超级TV网站的资讯信息,输入给定关键字抓取微信资讯信息。
给定关键字:数字;融合;电视
抓取信息内如下:
1、资讯标题
2、资讯链接
3、资讯时间
4、资讯来源
二、网站信息
三、数据抓取
针对上面的网站信息,来进行抓取
1、首先抓取信息列表
抓取代码:sels = site.xpath('//ul[@class="la_list"]/li')
2、抓取标题
抓取代码:title = str(sel.xpath('.//h4/a/text()')[0].extract())
3、抓取链接
抓取代码:url = str(sel.xpath('.//h4/a/@href')[0].extract())
4、抓取日期
抓取代码:strdates = sel.xpath('.//div[@class="time"]/span/text()')
5、抓取来源
抓取代码:sources = site.xpath('//span[@class="wzof"]/a/text()');或sources = site.xpath('//span[@class="wzof"]/text()')
四、完整代码
# -*- coding: utf-8 -*- import scrapy from scrapy import Request from scrapy.spiders import Spider from scrapy_splash import SplashRequest from scrapy_splash import SplashMiddleware from scrapy.http import Request, HtmlResponse from scrapy.selector import Selector from scrapy_splash import SplashRequest from scrapy_ott.items import SplashTestItem from scrapy_ott.mongoDB import mongoDbBase import scrapy_ott.IniFile import sys import os import re import time reload(sys) sys.setdefaultencoding('utf-8') # sys.stdout = open('output.txt', 'w') class chaojitvSpider(Spider): name = 'chaojitv' db = mongoDbBase() configfile = os.path.join(os.getcwd(), 'scrapy_ott\setting.conf') cf = scrapy_ott.IniFile.ConfigFile(configfile) information_wordlist = cf.GetValue("section", "information_keywords").split(';') websearchurl_list = cf.GetValue("chaojitv", "websearchurl").split(';') start_urls = [] for url in websearchurl_list: start_urls.append(url) # request需要封装成SplashRequest def start_requests(self): for url in self.start_urls: yield SplashRequest(url , self.parse , args={'wait': '2'} ) def Comapre_to_days(self,leftdate, rightdate): ''' 比较连个字符串日期,左边日期大于右边日期多少天 :param leftdate: 格式:2017-04-15 :param rightdate: 格式:2017-04-15 :return: 天数 ''' l_time = time.mktime(time.strptime(leftdate, '%Y-%m-%d')) r_time = time.mktime(time.strptime(rightdate, '%Y-%m-%d')) result = int(l_time - r_time) / 86400 return result def date_isValid(self, strDateText): ''' 判断日期时间字符串是否合法:如果给定时间大于当前时间是合法,或者说当前时间给定的范围内 :param strDateText: 四种格式 '2小时前'; '2天前' ; '昨天' ;'2017.2.12 ' :return: True:合法;False:不合法 ''' currentDate = time.strftime('%Y-%m-%d') datePattern = re.compile(r'\d{4}-\d{2}-\d{2}') strDate = re.findall(datePattern, strDateText) if len(strDate) == 1: if self.Comapre_to_days(currentDate, strDate[0]) <= 1: return True, strDate[0] return False, '' def parse(self, response): site = Selector(response) sels = site.xpath('//ul[@class="la_list"]/li') for sel in sels: strdates = sel.xpath('.//div[@class="time"]/span/text()') if len(strdates)>0: flag, date = self.date_isValid(str(strdates[0].extract())) if flag: title = str(sel.xpath('.//h4/a/text()')[0].extract()) for keyword in self.information_wordlist: if title.find(keyword) > -1: url = str(sel.xpath('.//h4/a/@href')[0].extract()) yield SplashRequest(url , self.parse_item , args={'wait': '1'}, meta={'date': date, 'url': url, 'keyword': keyword, 'title': title} ) def parse_item(self, response): site = Selector(response) it = SplashTestItem() it['title'] = response.meta['title'] it['url'] = response.meta['url'] it['date'] = response.meta['date'] it['keyword'] = response.meta['keyword'] sources = site.xpath('//span[@class="wzof"]/a/text()') if len(sources)>0: it['source'] = sources[0].extract() else: #时间:2017-06-15 来源:环球网 编辑:叶子 sources = site.xpath('//span[@class="wzof"]/text()') if len(sources)>0: ss= str(sources[0].extract()).split(':') if len(ss)>2: it['source']= ss[2].replace(u'编辑: ','').replace(' ','') self.db.SaveInformation(it) return it