一、介绍
本例子用Selenium +phantomjs爬取36氪网站（http://36kr.com/search/articles/电视?page=1）的资讯信息，输入给定关键字抓取资讯信息。
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：Elements = doc('li[class="item"]')
2、抓取标题
抓取代码：title = element('div[class="intro"]').find('h3').find('div').text().encode('utf8').strip().replace(' ','')
3、抓取链接
抓取代码：url = 'http://36kr.com' + element.find('a').attr('href')
4、抓取日期
抓取代码：strdate = element('span[class="time"]').text().encode('utf8').strip()
5、抓取来源
抓取代码：source = element('div[class="am-cf inner_li"]').find('span[class="company mark h5_mark"]').text().encode('utf8').strip()
四、完整代码
# coding=utf-8 import os import re from selenium import webdriver import selenium.webdriver.support.ui as ui import time from datetime import datetime import IniFile # from threading import Thread from pyquery import PyQuery as pq import LogFile import mongoDB import urllib class kr36Spider(object):def __init__(self):logfile = os.path.join(os.path.dirname(os.getcwd()), time.strftime('%Y-%m-%d') + '.txt')self.log = LogFile.LogFile(logfile)configfile = os.path.join(os.path.dirname(os.getcwd()), 'setting.conf')cf = IniFile.ConfigFile(configfile)webSearchUrl_list = cf.GetValue("kr36", "webSearchUrl")self.keyword_list = cf.GetValue("section", "information_keywords").split(';')self.db = mongoDB.mongoDbBase()self.start_urls = []for word in self.keyword_list:self.start_urls.append(webSearchUrl_list + urllib.quote(word))self.driver = webdriver.PhantomJS()self.wait = ui.WebDriverWait(self.driver, 2)self.driver.maximize_window()def scroll_foot(self):'''滚动条拉到底部:return:'''js = ""# 如何利用chrome驱动或phantomjs抓取if self.driver.name == "chrome" or self.driver.name == 'phantomjs':js = "var q=document.body.scrollTop=10000"# 如何利用IE驱动抓取elif self.driver.name == 'internet explorer':js = "var q=document.documentElement.scrollTop=10000"return self.driver.execute_script(js)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) / 86400return resultdef 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')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])< 20:return True, currentDatereturn False, ''def log_print(self, msg):'''# 日志函数# :param msg: 日志信息# :return:# '''print '%s: %s' % (time.strftime('%Y-%m-%d %H-%M-%S'), msg)def scrapy_date(self):strsplit = '------------------------------------------------------------------------------------'for link in self.start_urls:self.driver.get(link)time.sleep(1)self.scroll_foot()selenium_html = self.driver.execute_script("return document.documentElement.outerHTML")doc = pq(selenium_html)infoList = []self.log.WriteLog(strsplit)self.log_print(strsplit)Elements = doc('li[class="item"]')for element in Elements.items():strdate = element('span[class="time"]').text().encode('utf8').strip()flag, date = self.date_isValid(strdate)if flag:title = element('div[class="intro"]').find('h3').find('div').text().encode('utf8').strip().replace(' ','')for keyword in self.keyword_list:if title.find(keyword) > -1:url = 'http://36kr.com' + element.find('a').attr('href')source = element('div[class="am-cf inner_li"]').find('span[class="company mark h5_mark"]').text().encode('utf8').strip()dictM = {'title': title, 'date': date,'url': url, 'keyword': keyword, 'introduction': title, 'source': source}infoList.append(dictM)# self.log.WriteLog('title:%s' % title)# self.log.WriteLog('url:%s' % url)# self.log.WriteLog('source:%s' % source)# self.log.WriteLog('kword:%s' % keyword)# self.log.WriteLog(strsplit) self.log_print('title:%s' % dictM['title'])self.log_print('url:%s' % dictM['url'])self.log_print('date:%s' % dictM['date'])self.log_print('source:%s' % dictM['source'])self.log_print('kword:%s' % dictM['keyword'])self.log_print(strsplit)breakif len(infoList)>0:self.db.SaveInformations(infoList)self.driver.close()self.driver.quit()obj = kr36Spider() obj.scrapy_date()
