06-Selenium&PhantomJS&He

作者: 郑元吉 | 来源:发表于2018-11-30 09:34 被阅读10次

06-Selenium&PhantomJS&He
He can he up and He do it!
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《HE》

浏览器驱动下载

IE11的Webdriver下载：
    http://dl.pconline.com.cn/download/771640-1.html
    链接：https://pan.baidu.com/s/13TTyXGNaG5cpSNdl1k9ksQ 密码：2n9n

Chrome65.0.3325.146的webdriver驱动下载：
    多版本：http://chromedriver.storage.googleapis.com/index.html
    或 http://npm.taobao.org/mirrors/chromedriver/2.43/

Firefox58的webdriver驱动下载
    链接：https://pan.baidu.com/s/1RATs8y-9Vige0IxcKdn83w 密码：l41g

一. Selenium使用

1.get(url)：打开URL

def openURL():
    driver = webdriver.Chrome()
    driver.get("http://www.baidu.com")
    print(driver.page_source)

  - clear() ： 清除数据 Clears the text if it’s a text entry element.
  - page_source：获取HTML源码
  - close()：关闭
  - quit()：全部关闭
  - click()：点击，Clicks the element.
  - execute_script(script, *args)： 执行脚本

driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")

# 下拉滚动条，使浏览器加载出动态加载的内容
while True:
    # 可能像这样要拉很多次，中间要适当的延时。
    # 如果说说内容都很长，就增大下拉的长度。
    for i in range(10):
        driver.execute_script("window.scrollBy(0,1000)")
        time.sleep(3)
    driver.execute_script("window.scrollTo(0, document.body.scrollHeight)")
    break

查找元素

 find_element(by='id', value=None)
 find_element_by_class_name(name)
     Finds element within this element’s children by class name
 find_element_by_css_selector(css_selector) 
     Finds element within this element’s children by CSS selector
 find_element_by_id(id_)
     Finds element within this element’s children by ID
 find_element_by_link_text(link_text)
     Finds element within this element’s children by visible link text
 find_element_by_name(name)
     Finds element within this element’s children by name
 find_element_by_tag_name(name)
     Finds element within this element’s children by tag name
 find_element_by_xpath(xpath)
     Finds element by xpath.

myelement.find_element_by_xpath(".//a")

However, this will select the first link on the page.

 lements(by='id', value=None)
     ‘Private’ method used by the find_elements_by_* methods.
 find_elements_by_class_name(name)
     Finds a list of elements within this element’s children by class name.
 find_elements_by_css_selector(css_selector)
     Finds a list of elements within this element’s children by CSS selector.
 find_elements_by_id(id_)
     Finds a list of elements within this element’s children by ID. Will return a list of webelements if found, or an empty list if not.
 find_elements_by_link_text(link_text)
     Finds a list of elements within this element’s children by visible link text.
 find_elements_by_name(name)
     Finds a list of elements within this element’s children by name.
 find_elements_by_tag_name(name)
     Finds a list of elements within this element’s children by tag name.
 find_elements_by_xpath(xpath)
     Finds elements within the element by xpath.
 get_attribute(name)
     Gets the given attribute or property of the element.

示例:

# Check if the "active" CSS class is applied to an element.
is_active = "active" in target_element.get_attribute("class")

 save_screenshot(filename)
     Saves a screenshot of the current element to a PNG image file. Returns
 send_keys(*value)
     Simulates typing into the element.

form_textfield = driver.find_element_by_name('username')
form_textfield.send_keys("admin")

search.send_keys("海贼王", Keys.ARROW_DOWN) # 回车

This can also be used to set file inputs.

file_input = driver.find_element_by_name('profilePic')
file_input.send_keys("path/to/profilepic.gif")

示例：selenium登录知乎

import time
from selenium import webdriver

driver = webdriver.Chrome()
driver.get('https://www.zhihu.com/')

# 点击登录按钮
driver.find_element_by_xpath('//*[@id="root"]/div/main/div/div/div/div[2]/div[2]/span').click()
time.sleep(2)

# 输入用户名
username = driver.find_element_by_name("username")
username.send_keys('18588403840')
time.sleep(2)

# 输入密码
password = driver.find_element_by_name("password")
password.send_keys('Changeme_123')
time.sleep(8)

# 登录
driver.find_element_by_xpath('//*[@id="root"]/div/main/div/div/div/div[2]/div[1]/form/button').click()

# 登录后获取登录后的信息
driver.get('https://www.zhihu.com/people/zuo-zai-fen-tou-diao-xi-gui-82/activities')
print(driver.page_source)

# 可以登录后的获取cookie
# print(driver.get_cookies())


# 新版知乎设置了反爬了， 如果上面的方式无法登录：可以使用第三方登录
# 进入登陆页面
driver.find_element_by_xpath(".//*[@class='SignContainer-switch']/span").click()

# 点击社交网络账号登陆
driver.find_element_by_xpath(".//*[@class='Login-socialLogin']/button").click()
# 点击QQ登陆
driver.find_element_by_xpath(".//*[@class='Login-socialButtonGroup']/button[3]").click()

time.sleep(15)  # 时间不够的自己加
driver.refresh()  # 15秒后要刷新

# 登录后
# 获取cookie
print(driver.get_cookies())

selenium设置代理

from selenium import webdriver
chromeOptions = webdriver.ChromeOptions()

# 设置代理
# 一定要注意，=两边不能有空格，不能是这样--proxy-server = http://202.20.16.82:10152
chromeOptions.add_argument("--proxy-server=http://10.3.132.6:808")
browser = webdriver.Chrome(chrome_options=chromeOptions)

# 查看本机ip，查看代理是否起作用
browser.get("https://blog.csdn.net/zwq912318834/article/details/78626739")
print(browser.page_source)

# 退出，清除浏览器缓存
# browser.quit()

二. PhantomJS 无界面浏览器

已停止研发

三. Headless

Headless Chrome是Chrome 浏览器的无界面形态，可以在不打开浏览器的前提下，使用所有 Chrome 支持的特性运行程序。相比于现代浏览器，Headless Chrome 更加方便测试web应用，获得网站的截图，做爬虫抓取信息等，也更加贴近浏览器环境。

Headless Chrome基于PhantomJS（QtWebKit内核）由谷歌Chrome团队开发。团队表示将专注研发这个项目

确保你的 chrome 浏览器版本是 60+.

配置

from selenium.webdriver.chrome.options import Options

chrome_options = Options()
chrome_options.add_argument("--headless")  # 使用headless 无界面形态
chrome_options.add_argument('--disable-gpu')  # 禁用gpu

driver = webdriver.Chrome(chrome_options=chrome_options)