scrapy-splash抓取动态数据例子六

Posted shaomine

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  一、介绍

    本例子用scrapy-splash抓取中广互联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="content_list clearfix"]\')

    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(\'.//div[@class="content_listtext"]/a/h3/text()\')

    3、抓取链接

      抓取代码:url = \'http://www.tvoao.com\' + str(sel.xpath(\'.//a/@href\')[0].extract())

    4、抓取日期

      抓取代码:strdates = sel.xpath(\'.//div[@class="listtext_label"]/span/text()\')

    5、抓取来源

      抓取代码:sources = site.xpath(\'//div[@class="headlines_source"]/span[2]/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 tvoaoSpider(Spider):
    name = \'tvoao\'

    configfile = os.path.join(os.getcwd(), \'splash_test\\spiders\\setting.conf\')

    cf = IniFile.ConfigFile(configfile)
    information_wordlist = cf.GetValue("section", "information_keywords").split(\';\')
    websearch_urls = cf.GetValue("tvoao", "websearchurl").split(\';\')
    start_urls = []
    for url in websearch_urls:
        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]) == 0:
                return True, currentDate
        return False, \'\'

    def parse(self, response):
        site = Selector(response)
        sels = site.xpath(\'//li[@class="content_list clearfix"]\')
        for sel in sels:
            strdates = sel.xpath(\'.//div[@class="listtext_label"]/span/text()\')

            if len(strdates)>0:
                flag, date = self.date_isValid(str(strdates[0].extract()))
                if flag:
                    titles = sel.xpath(\'.//div[@class="content_listtext"]/a/h3/text()\')
                    if len(titles) > 0:
                        title = str(titles[0].extract())

                    url = \'http://www.tvoao.com\' + str(sel.xpath(\'.//a/@href\')[0].extract())
                    for keyword in self.information_wordlist:
                        if title.find(keyword) > -1:
                            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="headlines_source"]/span[2]/text()\')
        if len(sources)>0:
            it[\'source\'] = str(sources[0].extract()).replace(u\'来源: \', \'\')
        return it

 

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