使用Selenium反爬(美团)

美团的反爬机制是非常完善的，在用selenium登陆淘宝的时候发现美团能检测到并弹出滑块，然后无论怎么滑动都通过不了，在经过一番搜索后发现很多网站对selenium都有检测机制，如检测是否存在特有标识 。接下来我们简单分享下使用代理访问美团进行数据采集。

示例如下：

 

# -*- coding:UTF-8 -*- import time import re from datetime import date, timedelta from selenium import webdriver from selenium.common.exceptions import NoSuchElementException from selenium.webdriver import ActionChains from selenium.webdriver.chrome.options import Options TB_LOGIN_URL = 'https://meituan.com' CHROME_DRIVER = '/usr/local/bin/chromedriver' # Windows和Mac的配置路径不一样 class SessionException(Exception):  """  会话异常类  """  def __init__(self, message):  super().__init__(self)  self.message = message  def __str__(self):  return self.message class Crawler:  def __init__(self):  self.browser = None  def start(self, username, password):  print("初始化浏览器")  self.__init_browser()  print("切换至密码输入框")  self.__switch_to_password_mode()  time.sleep(0.5)  print("输入用户名")  self.__write_username(username)  time.sleep(2.5)  print("输入密码")  self.__write_password(password)  time.sleep(3.5)  print("程序模拟解锁")  if self.__lock_exist():  self.__unlock()  print("开始发起登录请求")  self.__submit()  time.sleep(4.5)  # 登录成功，直接请求页面  print("登录成功，跳转至目标页面")  self.__navigate_to_target_page()  time.sleep(6.5)  print("解析页面文本")  crawler_list = self.__parse_page_content();  # 连接数据库并保存数据  print("保存数据到mysql数据库")  self.__save_list_to_db(crawler_list)  def __switch_to_password_mode(self):  """  切换到密码模式  :return:  """  if self.browser.find_element_by_id('J_QRCodeLogin').is_displayed():  self.browser.find_element_by_id('J_Quick2Static').click()  def __write_username(self, username):  """  输入账号  :param username:  :return:  """  username_input_element = self.browser.find_element_by_id('TPL_username_1')  username_input_element.clear()  username_input_element.send_keys(username)  def __write_password(self, password):  """  输入密码  :param password:  :return:  """  password_input_element = self.browser.find_element_by_id("TPL_password_1")  password_input_element.clear()  password_input_element.send_keys(password)  def __lock_exist(self):  """  判断是否存在滑动验证  :return:  """  return self.__is_element_exist('#nc_1_wrapper') and self.browser.find_element_by_id(  'nc_1_wrapper').is_displayed()  def __unlock(self):  """  执行滑动解锁  :return:  """  bar_element = self.browser.find_element_by_id('nc_1_n1z')  ActionChains(self.browser).drag_and_drop_by_offset(bar_element, 800, 0).perform()  time.sleep(1.5)  self.browser.get_screenshot_as_file('error.png')  if self.__is_element_exist('.errloading > span'):  error_message_element = self.browser.find_element_by_css_selector('.errloading > span')  error_message = error_message_element.text  self.browser.execute_script('noCaptcha.reset(1)')  raise SessionException('滑动验证失败, message = ' + error_message)  def __submit(self):  """  提交登录  :return:  """  self.browser.find_element_by_id('J_SubmitStatic').click()  time.sleep(0.5)  if self.__is_element_exist("#J_Message"):  error_message_element = self.browser.find_element_by_css_selector('#J_Message > p')  error_message = error_message_element.text  raise SessionException('登录出错, message = ' + error_message)  #跳转至目标页面  def __navigate_to_target_page(self):  pass  # 解析网页数据  def __parse_page_content(self):  pass  #保存数据  def __save_list_to_db(self, crawler_list):  pass  def __init_browser(self):  """  初始化selenium浏览器  :return:  """  options = Options()  # options.add_argument("--headless")  prefs = {"profile.managed_default_content_settings.images": 1}  options.add_experimental_option("prefs", prefs)  options.add_argument('--proxy-server=http://127.0.0.1:9000')  options.add_argument('disable-infobars')  options.add_argument('--no-sandbox')  self.browser = webdriver.Chrome(executable_path=CHROME_DRIVER, options=options)  self.browser.implicitly_wait(3)  self.browser.maximize_window()  self.browser.get(TB_LOGIN_URL) #执行命令行 Crawler().start('username'), 'password'))