selenium+headless chrome爬虫的实现示例

      python爬虫写起来非常快，虽然也可以用java，但是没有python来的简洁迅速

      selenium在前面总结过，是一个自动化测试库。headless chrome是 * 面的浏览器模式，和PHANTOMJS类似。但是PHANTOMJS往往会出现莫名的错误，而且速度没有headless chrome快

from selenium.webdriver.chrome.options import Options

global DRIVER
chrome_options = Options()
chrome_options.add_argument('--headless')
chrome_options.add_argument('--disable-gpu')

DRIVER = webdriver.Chrome(chrome_options=chrome_options)

        爬虫的代码有一点需要注意，需要操作事件的时候最好不要直接用相应的方法，比如click。最好嵌入js脚本的方式进行调用。因为爬虫的代码执行速度很快，前端元素结构往往反应不过来，从而找出元素不可见或者不存在的错误。

province_items = DRIVER.find_element_by_class_name("city-province").find_elements_by_tag_name("a")

#province_item.click()
DRIVER.execute_script('arguments[0].click();',province_item)

          下面来个例子，由于做电商平台，省、市、区的数据很好找，但是没有镇、街道的信息。这里通过爬虫从淘宝网将镇，街道的信息抓取下来

#! /usr/local/bin/python
# encoding: utf-8

'''
Created on 2018年1月5日

@author: wulinfeng
@date: 2018-1-5
'''

import time
#import request
from selenium import webdriver
#from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.chrome.options import Options
import pymysql

def init_db():
 global CONNECTION
 CONNECTION = pymysql.connect("地址","用户名","密码","数据库" ,use_unicode=True, charset="utf8")

def init_web_driver():
 global DRIVER
 #DRIVER = webdriver.PhantomJS(executable_path='C:\phantomjs-1.9.2-windows\phantomjs.exe')
 #DRIVER.set_window_size(1920, 1080)
 '''  
 dcap = dict(DesiredCapabilities.PHANTOMJS)

dcap["phantomjs.page.settings.userAgent"] = (
   "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 "
   "(KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36"
 )

dcap["phantomjs.page.settings.viewportSize"] = (
   "width: 1920, "
   "height: 1080"
 )

DRIVER = webdriver.PhantomJS(executable_path='C:\phantomjs-1.9.2-windows\phantomjs.exe',desired_capabilities=dcap)
 DRIVER.set_window_size(1920, 1080)
 '''

chrome_options = Options()
 chrome_options.add_argument('--headless')
 chrome_options.add_argument('--disable-gpu')

DRIVER = webdriver.Chrome(chrome_options=chrome_options)

#DRIVER=webdriver.Ie()
 #DRIVER=webdriver.Chrome()

def close_db():
 CONNECTION.close()    

def close_web_driver():
 DRIVER.quit()

def login_taobao(username, password):
 DRIVER.get("https://member1.taobao.com/member/fresh/deliver_address.htm?spm=a1z08.2.0.0.7dad47611Wnj46")
 #DRIVER.get("https://login.taobao.com/member/login.jhtml?spm=a21bo.2017.201864-2.d1.7d2082a4FxukGr&f=top&redirectURL=http％3A％2F％2Fwww.taobao.com％2F")
 #选择登陆方式
 DRIVER.find_element_by_xpath("//*[@id=\"J_Quick2Static\"]").click()

#登陆
 input_user = DRIVER.find_element_by_xpath("//*[@id=\"TPL_username_1\"]")
 input_user.clear()
 input_user.send_keys(username)

DRIVER.find_element_by_xpath("//*[@id=\"TPL_password_1\"]").send_keys(password)
 DRIVER.find_element_by_xpath("//*[@id=\"J_SubmitStatic\"]").click();

time.sleep(0.5)

def get_data():
 #点击地址选择
 #DRIVER.find_element_by_xpath("//*[@id=\"city-title\"]").click()
 city_title = DRIVER.find_element_by_id("city-title")
 DRIVER.execute_script('arguments[0].click();',city_title)

get_province_and_sub()

def get_province_and_sub():
 #获得省列表
 province_items = DRIVER.find_element_by_class_name("city-province").find_elements_by_tag_name("a")

for province_item in province_items:
   pid = province_item.get_attribute("attr-id");
   pname = province_item.get_attribute("title");
   if pid == "-1":
     print("continue province")
     continue

sql = "insert into region_province_t (province_id,province) values('"+pid+"','"+pname+"')"
   print(sql)
   cursor = CONNECTION.cursor()
   cursor.execute(sql)
   CONNECTION.commit()

#province_item.click()
   DRIVER.execute_script('arguments[0].click();',province_item)
   time.sleep(0.5)

get_city_and_sub(pid)
   back_tab(0)

def get_city_and_sub(pid):
 #获得市列表
 city_items = DRIVER.find_element_by_class_name("city-city").find_elements_by_tag_name("a")
 for city_item in city_items:
   cid = city_item.get_attribute("attr-id");
   cname = city_item.get_attribute("title");
   if cid == "-1":
     print("continue city")
     continue

sql = "insert into region_city_t (city_id,city,province_id) values('"+cid+"','"+cname+"','"+pid+"')"
   print(sql)
   cursor = CONNECTION.cursor()
   cursor.execute(sql)
   CONNECTION.commit()

#city_item.click()
   DRIVER.execute_script('arguments[0].click();',city_item)
   time.sleep(1)

get_area_and_sub(cid)
   back_tab(1)

def get_area_and_sub(cid):
 #获得县区列表
 area_items = DRIVER.find_element_by_class_name("city-district").find_elements_by_tag_name("a")
 for area_item in area_items:
   aid = area_item.get_attribute("attr-id");
   aname = area_item.get_attribute("title");
   if aid == "-1":
     print("continue area")
     continue

sql = "insert into region_area_t (area_id,area,city_id) values('"+aid+"','"+aname+"','"+cid+"')"
   print(sql)
   cursor = CONNECTION.cursor()
   cursor.execute(sql)
   CONNECTION.commit()

#area_item.click()
   DRIVER.execute_script('arguments[0].click();',area_item)
   time.sleep(0.5)

get_town_and_sub(aid)
   back_tab(2)

def get_town_and_sub(aid):
 #获得镇列表
 town_items = DRIVER.find_element_by_class_name("city-street").find_elements_by_tag_name("a")
 for town_item in town_items:
   tid = town_item.get_attribute("attr-id");
   tname = town_item.get_attribute("title");
   if tid == "-1":
     print("continue town")
     continue

sql = "insert into region_town_t (town_id,town,area_id) values('"+tid+"','"+tname+"','"+aid+"')"
   print(sql)
   cursor = CONNECTION.cursor()
   cursor.execute(sql)
   CONNECTION.commit()

def back_tab(index):
 districtEle = DRIVER.find_element_by_class_name("city-select-tab").find_elements_by_tag_name("a")[index]
 DRIVER.execute_script('arguments[0].click();',districtEle)
 time.sleep(0.5)

init_db()
init_web_driver()
login_taobao("用户名", "密码")
get_data()
close_db()
close_web_driver()

来源：https://blog.csdn.net/guduyishuai/article/details/78988793