• scrapy-splash抓取动态数据例子十三


      一、介绍

        本例子用scrapy-splash通过搜狗搜索引擎,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('//li[contains(@id,"sogou_vr")]')

        2、抓取标题

          抓取代码:titles = sel.xpath('.//div[@class="txt-box"]/h3/a/text()|.//div[@class="txt-box"]/h3/a/em/text()')

        3、抓取链接

          抓取代码:sel.xpath('.//div[@class="txt-box"]/h3/a/@href')[0].extract()

        4、抓取日期

          抓取代码:strdate = sel.xpath('.//span[@class="s2"]/text()')

        5、抓取来源

          抓取代码:sources = sel.xpath('.//div[@class="s-p"]/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 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 weixinSpider(Spider):
        name = 'weixin'
    
        db = mongoDbBase()
    
        configfile = os.path.join(os.getcwd(), 'scrapy_ottsetting.conf')
        cf = scrapy_ott.IniFile.ConfigFile(configfile)
        information_keywords = cf.GetValue("section", "information_keywords")
        information_wordlist = information_keywords.split(';')
        websearchurl_list = cf.GetValue("weixin", "websearchurl").split(';')
        start_urls = []
        for word in information_wordlist:
            for url in websearchurl_list:
                start_urls.append(url + 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 '慧聪网 7小时前'; '新浪游戏 29分钟前' ; '中国行业研究网 2017-6-13'
            :return: True:合法;False:不合法
            '''
            currentDate = time.strftime('%Y-%m-%d')
    
            if strDateText.find('分钟前') > 0 :
                return True,currentDate
            elif strDateText.find('小时前') > 0:
                datePattern = re.compile(r'd{1,2}')
                ch = int(time.strftime('%H'))  # 当前小时数
                strDate = re.findall(datePattern, strDateText)
                if len(strDate) == 1:
                    if int(strDate[0]) <= ch:  # 只有小于当前小时数,才认为是今天
                        return True,currentDate
            else:
                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):
            keyword = response.meta['keyword']
            site = Selector(response)
            sels = site.xpath('//li[contains(@id,"sogou_vr")]')
            item_list = []
            for sel in sels:
                strdate = sel.xpath('.//span[@class="s2"]/text()')
                if len(strdate)>0:
                    flag,date = self.date_isValid(strdate[0].extract())
                    if flag:
                        titles = sel.xpath('.//div[@class="txt-box"]/h3/a/text()|.//div[@class="txt-box"]/h3/a/em/text()')
                        title = ''
                        for t in titles:
                            title += str(t.extract())
                        if title.find(keyword) > -1:
                            it = SplashTestItem()
                            sources = sel.xpath('.//div[@class="s-p"]/a/text()')
                            if len(sources)>0:
                                it['source'] = sources[0].extract()
                            it['url'] = sel.xpath('.//div[@class="txt-box"]/h3/a/@href')[0].extract()
                            it['date'] = date
                            it['keyword'] = keyword
                            it['title'] = title
                            item_list.append(it)
    
            if len(item_list)>0:
                # self.db.SaveInformations(item_list)
                return item_list
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  • 原文地址:https://www.cnblogs.com/shaosks/p/7019058.html
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