Python使用Selenium爬取淘宝异步加载的数据方法_Python

淘宝的页面很复杂，如果使用分析ajax或者js的方式，很麻烦

抓取淘宝‘美食'上面的所有食品信息

spider.py

				?

									#encoding:utf8

									import re

									from selenium import webdriver

									from selenium.common.exceptions import TimeoutException

									from selenium.webdriver.common.by import By

									from selenium.webdriver.support.ui import WebDriverWait

									from selenium.webdriver.support import expected_conditions as EC

									from bs4 import BeautifulSoup

									from config import *

									import pymongo

									client=pymongo.MongoClient(MONGODB_URL)

									db=client[MONGODB_DB]

									##这里使用PhantomJS，并配置了一些参数

									browser=webdriver.PhantomJS(service_args=SERVICE_ArGS)

									##窗口的大小，不设置的话，默认太小，会有问题

									browser.set_window_size(1400,900)

									wait=WebDriverWait(browser, 10)

									def search():

									  print('正在搜索')

									##容易出现超时的错误

									  try:

									##等待这两个模块都加载好

									    browser.get("https://www.taobao.com")

									    input = wait.until(

									        EC.presence_of_element_located((By.CSS_SELECTOR, '#q'))

									      )

									    submit=wait.until(

									        EC.element_to_be_clickable((By.CSS_SELECTOR, '#J_TSearchForm > div.search-button > button'))

									      )

									    ######这块python2搞得鬼

									    #input.send_keys('\u7f8e\u98df'.decode("unicode-escape"))

									    input.send_keys(KEYWORD.decode("unicode-escape"))

									    submit.click()

									    total = wait.until(

									        EC.presence_of_element_located((By.CSS_SELECTOR, '#mainsrp-pager > div > div > div > div.total'))

									      )

									    get_product()

									    return total.text

									  except TimeoutException:

									    return search()

									def next_page(page_number):

									  print('翻页'+str(page_number))

									  try:

									    input = wait.until(

									          EC.presence_of_element_located((By.CSS_SELECTOR, '#mainsrp-pager > div > div > div > div.form > input'))

									        )

									    submit=wait.until(

									        EC.element_to_be_clickable((By.CSS_SELECTOR, '#mainsrp-pager > div > div > div > div.form > span.btn.J_Submit'))

									      )

									    input.clear()

									    input.send_keys(page_number)

									    submit.click()

									##判断是否翻页成功 高亮的是不是输入的值，直接加在后面即可

									    wait.until(EC.text_to_be_present_in_element((By.CSS_SELECTOR,'#mainsrp-pager > div > div > div > ul > li.item.active > span'),str(page_number)))

									    get_product()

									  except TimeoutException:

									    return next_page(page_number)

									#获取产品信息

									def get_product():

									  products = wait.until(

									    EC.presence_of_element_located((By.CSS_SELECTOR, '#mainsrp-itemlist .m-itemlist .items'))

									        )

									##拿到网页

									  html = browser.page_source

									  soup = BeautifulSoup(html,'lxml')

									  items = soup.select('#mainsrp-itemlist .m-itemlist .items .item.J_MouserOnverReq')#

									  print('*************************到此*************')

									  for item in items:

									    img = item.select('.J_ItemPic.img')[0].get('src')

									    price = item.select('.price.g_price.g_price-highlight > strong')[0].get_text()

									    deal = item.select('.deal-cnt')[0].get_text()

									    title= item.select('.row.row-2.title > a ')[0].get_text().strip() #:nth-of-type(3)

									    shop = item.select('.row.row-3.g-clearfix > .shop > a > span:nth-of-type(2)')[0].get_text() 

									    location = item.select('.location')[0].get_text()

									    product={

									      'img':img,

									      'price':price,

									      'deal':deal,

									      'title':title,

									      'shop':shop,

									      'location':location

									    }

									#打印一下

									    import json

									    j = json.dumps(product)

									    dict2 = j.decode("unicode-escape")

									    print dict2

									    save_to_mongo(product)

									def save_to_mongo(product):

									  try:

									    if db[MONGODB_TABLE].insert(product):

									      print('存储到mongodb成功'+str(product))

									  except Exception:

									    print("存储到mongodb失败"+str(product))

									def main():

									  try:

									    total=search()

									    ##搜寻 re正则表达式

									    s=re.compile('(\d+)')

									    total=int(s.search(total).group(1))

									    for i in range(2,total+1):

									      next_page(i)

									  except Exception:

									    print('出错')

									  finally:

									    browser.close()

									if __name__ == '__main__':

									  main()

config.py

				?

									MONGODB_URL='localhost'

									MONGODB_DB='taobao'

									MONGODB_TABLE='meishi'

									SERVICE_ArGS=['--load-images=false','--disk-cache=true']

									##就是美食这两个字，直接用汉字会报错

									KEYWORD='\u7f8e\u98df'