使用selenium和pyquery爬取京东商品列表过程解析

from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from pyquery import PyQuery as pq

#通过Chrome()方法打开chrome浏览器
browser = webdriver.Chrome()
#访问京东网站
browser.get("https://www.jd.com")
#等待50秒
wait = WebDriverWait(browser, 50)
#通过css选择器的id属性获得输入框
input = browser.find_element_by_id('key')
#在输入框中写入要查询的信息
input.send_keys('计算机书籍')
#获取查询按钮
submit_button = browser.find_element_by_class_name('button')
#点击查询按钮
submit_button.click()

from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from pyquery import PyQuery as pq
import time
#通过Chrome()方法打开chrome浏览器
browser = webdriver.Chrome()
#访问京东网站
browser.get("https://www.jd.com")
#等待50秒
wait = WebDriverWait(browser, 50)
#通过css选择器的id属性获得输入框
input = browser.find_element_by_id('key')
#在输入框中写入要查询的信息
input.send_keys('计算机书籍')
#获取查询按钮
submit_button = browser.find_element_by_class_name('button')
#点击查询按钮
submit_button.click()

# 模拟下滑到底部操作
for i in range(1, 5):
  browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
  time.sleep(1)

#商品列表的总页数
total = wait.until(
  EC.presence_of_all_elements_located(
    (By.CSS_SELECTOR, '#J_bottomPage > span.p-skip > em:nth-child(1) > b')
  )
)

html = browser.page_source.replace('xmlns', 'another_attr')

doc = pq(html)
#一个商品信息是存放在class=“gl-item”的li节点内，items()方法是获取所有的商品列表。
li_list = doc('.gl-item').items()
#循环解析每个商品的信息
for item in li_list:
  image_html = item('.gl-i-wrap .p-img')
  book_img_url = item.find('img').attr('data-lazy-img')
  if book_img_url == "done":
    book_img_url = item.find('img').attr('src')
  print('图片地址:' + book_img_url)
  item('.p-name').find('font').remove()
  book_name = item('.p-name').find('em').text()
  print('书名：' + book_name)
  price = item('.p-price').find('em').text() + str(item('.p-price').find('i').text())
  print('价格：' + price)
  commit = item('.p-commit').find('strong').text()
  print('评价数量：' + commit)
  shopnum = item('.p-shopnum').find('a').text()
  print('出版社：' + shopnum)
  print('++++++++++++++++++++++++++++++++++++++++++++')

  next_page_button = wait.until(
    EC.element_to_be_clickable((By.CSS_SELECTOR, '#J_bottomPage > span.p-num > a.pn-next > em'))
  )
  next_page_button.click()

  #滑动到页面底部，用于加载数据
  for i in range(0,3):
    browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    time.sleep(10)

  #一页显示60个商品，"#J_goodsList > ul > li:nth-child(60)确保60个商品都正常加载出来。
  wait.until(
    EC.presence_of_all_elements_located((By.CSS_SELECTOR, "#J_goodsList > ul > li:nth-child(60)"))
  )
  # 判断翻页成功，当底部的分页界面上显示第几页时，就显示翻页成功。
  wait.until(
    EC.text_to_be_present_in_element((By.CSS_SELECTOR, "#J_bottomPage > span.p-num > a.curr"), str(page_num))
  )

from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from pyquery import PyQuery as pq
import time
#打开不同的浏览器实例
def openBrower(brower_type):
  if brower_type == 'chrome':
    return webdriver.Chrome()
  elif brower_type == 'firefox':
    return webdriver.Firefox()
  elif brower_type == 'safari':
    return webdriver.Safari()
  elif brower_type == 'PhantomJS':
    return webdriver.PhantomJS()
  else :
    return webdriver.Ie()
def parse_website():
  # 通过Chrome()方法打开chrome浏览器
  browser = openBrower('chrome')
  # 访问京东网站
  browser.get("https://www.jd.com")
  # 等待50秒
  wait = WebDriverWait(browser, 50)
  # 通过css选择器的id属性获得输入框。until方法表示浏览器完全加载到对应的节点，才返回相应的对象。presence_of_all_elements_located是通过css选择器加载节点
  input = wait.until(
    EC.presence_of_all_elements_located((By.CSS_SELECTOR, '#key'))
  )

  # input = browser.find_element_by_id('key')
  # 在输入框中写入要查询的信息
  input[0].send_keys('计算机书籍')
  # 查询按钮完全加载完毕，返回查询按钮对象
  submit_button = wait.until(
    EC.element_to_be_clickable((By.CSS_SELECTOR, '.button'))
  )
  # 点击查询按钮
  submit_button.click()

  # 模拟下滑到底部操作
  for i in range(0,3):
    browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    time.sleep(3)

  # 商品列表的总页数
  total = wait.until(
    EC.presence_of_all_elements_located(
      (By.CSS_SELECTOR, '#J_bottomPage > span.p-skip > em:nth-child(1) > b')
    )
  )
  html = browser.page_source.replace('xmlns', 'another_attr')
  parse_book(1,html)

  for page_num in range(2,int(total[0].text) + 1):
    parse_next_page(page_num,browser,wait)

##解析下一页
def parse_next_page(page_num,browser,wait):

  next_page_button = wait.until(
    EC.element_to_be_clickable((By.CSS_SELECTOR, '#J_bottomPage > span.p-num > a.pn-next > em'))
  )
  next_page_button.click()

  #滑动到页面底部，用于加载数据
  for i in range(0,3):
    browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    time.sleep(10)

  #一页显示60个商品，"#J_goodsList > ul > li:nth-child(60)确保60个商品都正常加载出来。
  wait.until(
    EC.presence_of_all_elements_located((By.CSS_SELECTOR, "#J_goodsList > ul > li:nth-child(60)"))
  )
  # 判断翻页成功，当底部的分页界面上显示第几页时，就显示翻页成功。
  wait.until(
    EC.text_to_be_present_in_element((By.CSS_SELECTOR, "#J_bottomPage > span.p-num > a.curr"), str(page_num))
  )

  html = browser.page_source.replace('xmlns', 'another_attr')
  parse_book(page_num, html)

def parse_book(page,html):
  doc = pq(html)
  li_list = doc('.gl-item').items()
  print('-------------------第' + str(page) + '页的图书信息---------------------')
  for item in li_list:
    image_html = item('.gl-i-wrap .p-img')
    book_img_url = item.find('img').attr('data-lazy-img')
    if book_img_url == "done":
      book_img_url = item.find('img').attr('src')
    print('图片地址:' + book_img_url)
    item('.p-name').find('font').remove()
    book_name = item('.p-name').find('em').text()
    print('书名：' + book_name)
    price = item('.p-price').find('em').text() + str(item('.p-price').find('i').text())
    print('价格：' + price)
    commit = item('.p-commit').find('strong').text()
    print('评价数量：' + commit)
    shopnum = item('.p-shopnum').find('a').text()
    print('出版社：' + shopnum)
    print('++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++')

def main():
  parse_website()
if __name__ == "__main__":
  main()