[Python爬虫] 之十六：Selenium +phantomjs 利用 pyquery抓取一点咨询数据

　　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()