本篇主要是利用 pyquery来定位抓取数据，而不用xpath,通过和xpath比较，pyquery效率要高。
主要代码：
# coding=utf-8
import os
import re
from selenium import webdriver
import selenium.webdriver.support.ui as ui
import time
from datetime import datetime
from selenium.webdriver.common.action_chains import ActionChains
import IniFile
from threading import Thread
from pyquery import PyQuery as pq
import LogFile
import mongoDB class yidianzixunSpider(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)
self.webSearchUrl_list = cf.GetValue("yidianzixun", "webSearchUrl").split(';')
self.keyword_list = cf.GetValue("section", "information_keywords").split(';')
self.db = mongoDB.mongoDbBase()
self.start_urls = []
for url in self.webSearchUrl_list:
self.start_urls.append(url) 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) / 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')
if strDateText.find('分钟前') > 0 or strDateText.find('刚刚') > -1:
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
return 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: for i in range(5):
self.scroll_foot()
# time.sleep(1)
self.driver.get(link)
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('a[class^="item doc style-"]') # class属性内容以item doc style-开始的元素
for element in Elements.items():
date = element('span[class="date"]').text().encode('utf8').strip()
flag, strDate = self.date_isValid(date)
if flag:
title = element('div[class="doc-title"]').text().encode('utf8').strip() for keyword in self.keyword_list:
if title.find(keyword) > -1:
url = 'http://www.yidianzixun.com' + element.attr('href')
source = element('span[class="source"]').text().encode('utf8').strip() dictM = {'title': title, 'date': strDate,
'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_print('title:%s' % title)
self.log_print('url:%s' % url)
self.log_print('source:%s' % source)
self.log_print('kword:%s' % keyword)
break
if len(infoList)>0:
self.db.SaveInformations(infoList)
self.driver.close()
self.driver.quit() # obj = yidianzixunSpider()
# obj.scrapy_date()