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scrapy-splash抓取动态数据例子十三

2017-06-15 17:32 246 查看

  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_ott\setting.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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