scrapy-splash抓取動態數據例子十六 -开发者知识库

scrapy-splash抓取動態數據例子十六 -开发者知识库,第1张

  一、介紹

    本例子用scrapy-splash爬取梅花網(http://www.meihua.info/a/list/today)的資訊信息,輸入給定關鍵字抓取微信資訊信息。

    給定關鍵字:數字;融合;電視

    抓取信息內如下:

      1、資訊標題

      2、資訊鏈接

      3、資訊時間

      4、資訊來源

 

  二、網站信息

    

     scrapy-splash抓取動態數據例子十六 -开发者知识库,第2张

 

    scrapy-splash抓取動態數據例子十六 -开发者知识库,第3张

    scrapy-splash抓取動態數據例子十六 -开发者知识库,第4张

 

 

 

    scrapy-splash抓取動態數據例子十六 -开发者知识库,第5张

 

 

 

  三、數據抓取

    針對上面的網站信息,來進行抓取

    1、首先抓取信息列表

      抓取代碼:sels = site.xpath('//li[@class="item"]')

    2、抓取標題

      抓取代碼:titles = sel.xpath('.//div[@class="first"]/div[1]/a[1]/text()')

    3、抓取鏈接

      抓取代碼:url = 'http://www.meihua.info' str(sel.xpath('.//div[@class="first"]/div[1]/a[1]/@href')[0].extract())

    4、抓取日期

      抓取代碼:strdate = sel.xpath('.//span[@class="desc-font date"]/span/text()')

    5、抓取來源

      抓取代碼:sources = site.xpath('//a[@rel="nofollow"]/text()')

  

   

  四、完整代碼

   

# -*- 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
from scrapy_ott.LogFile import LogFile
import sys
import os
import re
import time

reload(sys)
sys.setdefaultencoding('utf-8')

# sys.stdout = open('output.txt', 'w')

class meihuaSpider(Spider):
    log = LogFile(time.strftime('%Y-%m-%d')   '.txt')
    name = 'meihua'

    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(';')
    websearch_urls = cf.GetValue("meihua", "websearchurl").split(';')
    start_urls = []
    for url in websearch_urls:
        start_urls.append(url)

    # request需要封裝成SplashRequest
    def start_requests(self):
        self.log.WriteLog(u'抓取梅花網資訊數據')
        for url in self.start_urls:
            yield SplashRequest(url
                                , self.parse
                                , args={'wait': '2'}
                                )

    def Comapre_to_days(self,leftdate, rightdate):
        '''
        比較連個字符串日期,左邊日期大於右邊日期多少天
        :param leftdate: 格式:2017-04-15
        :param rightdate: 格式:2017-04-15
        :return: 天數
        '''
        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):
        '''
        判斷日期時間字符串是否合法:如果給定時間大於當前時間是合法,或者說當前時間給定的范圍內
        :param strDateText: 四種格式 '今天'; '前天' ; '昨天' ;'06月12日 '
        :return: True:合法;False:不合法
        '''
        currentDate = time.strftime('%Y-%m-%d')
        if strDateText.find('今天') > -1 :
            return True, currentDate
        return False, ''
    def parse(self, response):

        site = Selector(response)
        sels = site.xpath('//li[@class="item"]')

        for sel in sels:
            strdate = sel.xpath('.//span[@class="desc-font date"]/span/text()')
            flag, date = self.date_isValid(strdate[0].extract())
            if flag:
                titles = sel.xpath('.//div[@class="first"]/div[1]/a[1]/text()')
                title = str(titles[0].extract())
                url = 'http://www.meihua.info'   str(sel.xpath('.//div[@class="first"]/div[1]/a[1]/@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="art-content"]/p[27]/strong/a/text()')
        sources = site.xpath('//a[@rel="nofollow"]/text()')
        if len(sources)>0:
            it['source'] = sources[0].extract()
        else:
            it['source'] = '梅花網'

            # sources = site.xpath('//div[@style="text-align: center;"]/font/text()')
            # if len(sources) > 1:
            #     it['source'] = str(sources[1].extract()).replace('消息源:','')
            # else:
            #     it['source']='梅花網'
        self.db.SaveInformation(it)
        return it

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