scrapy-splash抓取动态数据例子四
一、介绍
本例子用scrapy-splash抓取微众圈网站给定关键字抓取咨询信息。
给定关键字:打通;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('//li[@class="itemtitle"]')
2、抓取标题
首先列表页面,根据标题和日期来判断是否自己需要的资讯,如果是,就今日到资讯对应的链接,来抓取来源,如果不是,就不用抓取了
抓取代码:titles = sel.xpath('.//text()')
title =str(titles[1].extract())
3、抓取链接
抓取代码:url = 'http://www.v4.cc'+ str(sel.xpath('.//a/@href')[0].extract())
4、抓取日期
抓取代码:flag,date =self.date_isValid(str(titles[2].extract()))
5、抓取来源
抓取代码:sources = site.xpath('//div[@class="wxshare"]/span/a/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 splash_test.items import SplashTestItem import IniFile import sys import os import re import time reload(sys) sys.setdefaultencoding('utf-8') sys.stdout = open('output.txt', 'w') class weizhongquanSpider(Spider): name = 'weizhongquan' configfile = os.path.join(os.getcwd(), 'splash_test\spiders\setting.conf') cf = IniFile.ConfigFile(configfile) information_keywords = cf.GetValue("section", "information_keywords") information_wordlist = information_keywords.split(';') websearchurl = cf.GetValue("weizhongquan", "websearchurl") start_urls = [] for word in information_wordlist: start_urls.append(websearchurl + word) # request需要封装成SplashRequest def start_requests(self): for url in self.start_urls: index = url.rfind('=') yield SplashRequest(url , self.parse , args={'wait': '2'}, meta={'keyword': url[index + 1:]} ) 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{1,2}-\d{1,2}') strDate = re.findall(datePattern, strDateText) if len(strDate) == 1: if self.Comapre_to_days(currentDate,strDate[0])==0: return True,currentDate return False, '' def parse(self, response): site = Selector(response) keyword = response.meta['keyword'] sels = site.xpath('//li[@class="itemtitle"]') for sel in sels: titles = sel.xpath('.//text()') title =str(titles[1].extract()) flag,date =self.date_isValid(str(titles[2].extract())) if flag and title.find(keyword)>-1: url = 'http://www.v4.cc'+ str(sel.xpath('.//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('//div[@class="wxshare"]/span/a/text()') if len(sources)>0: it['source'] = sources[0].extract() return it