怎么在Python中使用Selenium实现异步加载数据-创新互联
怎么在Python中使用Selenium实现异步加载数据？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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'
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