Python使用Selenium爬取淘宝异步加载的数据方法

#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,\'l \')
  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()
     = item.select(\'.row.row-2.  > 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,
      \' \': ,
      \'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()

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\'