Python爬虫实现模拟点击动态页面

#!/usr/bin/python3
# -*- coding:utf-8 -*-
__author__ = 'mayi'
 
"""
动态页面的模拟点击：
  模拟点击斗鱼直播：http://www.douyu.com/directory/all
  爬取每页房间名、直播类型、主播名称、在线人数等数据，然后模拟点击下一页，继续爬取
"""
 
from selenium import webdriver
import json
 
# 调用环境变量指定的PhantomJS浏览器创建浏览器对象，executable_path：指定PhantomJS位置
driver = webdriver.PhantomJS(executable_path = r"D:\Program Files\phantomjs\bin\phantomjs")
from bs4 import BeautifulSoup
 
class DouyuSpider(object):
  """
  爬虫类
  """
  def __init__(self):
    self.url = "http://www.douyu.com/directory/all/"
    self.driver = webdriver.PhantomJS()
    self.file_name = open("douyu.json", "w", encoding = "utf-8")
 
  def run(self):
    """
    爬虫开始工作
    """
    self.driver.get(self.url)
    # 循环处理每一页，直至最后一页
    page = 1
    start_flag = True
    while True:
      # 等待3秒，防止访问过于频繁
      self.driver.implicitly_wait(3)
      print("正在处理第" + page + "页......")
      page += 1
      # 解析
      soup = BeautifulSoup(self.driver.page_source, "lxml")
      # 在线直播部分
      online_live = soup.find_all('ul', {'id': 'live-list-contentbox'})[0]
      # 房间列表
      live_list = online_live.find_all('li')
      # 处理每一个房间
      for live in live_list:
        # 房间名、直播类型、主播名称、在线人数
        # 房间名
        home_name = live.find_all('h3', {'class': 'ellipsis'})[0].get_text().strip()
        # 直播类型
        live_type = live.find_all('span', {'class': 'tag ellipsis'})[0].get_text().strip()
        # 主播名称
        anchor_name = live.find_all('span', {'class': 'dy-name ellipsis fl'})[0].get_text().strip()
        # 在线人数
        online_num = live.find_all('span', {'class' :'dy-num fr'})[0].get_text().strip()
        # print(home_name, live_type, anchor_name, online_num)
        item = {}
        item["房间名"] = home_name
        item["直播类型"] = live_type
        item["主播名称"] = anchor_name
        item["在线人数"] = online_num
        if start_flag:
          start_flag = False
          content = "[\n" + json.dumps(item)
        else:
          content = ",\n" + json.dumps(item)
        self.file_name.write(content)
      # page_source.find()未找到内容则返回-1
      if self.driver.page_source.find('shark-pager-disable-next') != -1:
        # 已到最后一页
        break
      # 模拟点击下一页
      self.driver.find_element_by_class_name('shark-pager-next').click()
 
    # 爬虫结束前关闭文件
    self.file_name.write("\n]")
    self.file_name.close()
if __name__ == '__main__':
  douyu = DouyuSpider()
  douyu.run()