使用selenium模拟登录解决滑块验证问题的实现

driver = webdriver.Chrome()
driver.get(url)

element = WebDriverWait(driver, 5, 0.5).until(
		EC.presence_of_element_located((By.ID, "switcher_plogin"))
	) # from selenium.webdriver.common.by import By
element.click()

driver.find_element_by_id('u').send_keys('123456') # 输入用户名
driver.find_element_by_id('p').send_keys('ccccc')  # 输入密码
driver.find_element_by_id('login_button').click()  # 点击登录

iframe = driver.find_element_by_xpath('//iframe') # 找到“嵌套”的iframe
driver.switch_to.frame(iframe)  # 切换到iframe

button = driver.find_element_by_id('tcaptcha_drag_button')    # 找到“蓝色滑块”
action = ActionChains(driver)            # 实例化一个action对象
action.click_and_hold(button).perform()  # perform()用来执行ActionChains中存储的行为
action.reset_actions()
action.move_by_offset(180, 0).perform()  # 移动滑块

def get_track(distance):
	track = []
	current = 0
	mid = distance * 3 / 4
	t = 0.2
	v = 0
	while current < distance:
		if current < mid:
			a = 2
		else:
			a = -3
		v0 = v
		v = v0 + a * t
		move = v0 * t + 1 / 2 * a * t * t
		current += move
		track.append(round(move))
	return track

# encoding=utf8
 
from time import sleep
from selenium import webdriver
from selenium.webdriver import ActionChains
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
 
url = 'https://xui.ptlogin2.qq.com/cgi-bin/xlogin"switcher_plogin"的元素是否加在DOM树中，如果出现了才能正常向下执行
	element = WebDriverWait(driver, 5, 0.5).until(
		EC.presence_of_element_located((By.ID, "switcher_plogin"))
	)
	element.click()
 
	sleep(1)
	# 输入用户名和密码
	driver.find_element_by_id('u').clear()
	driver.find_element_by_id('u').send_keys('123456')
	driver.find_element_by_id('p').clear()
	driver.find_element_by_id('p').send_keys('ccccc')
	sleep(1)
	# 点击登录
	driver.find_element_by_id('login_button').click()
 
	sleep(5)
 
	# 切换iframe
	try:
		iframe = driver.find_element_by_xpath('//iframe')
	except Exception as e:
		print 'get iframe failed: ', e
	sleep(2)	# 等待资源加载
	driver.switch_to.frame(iframe)
 
	# 等待图片加载出来
	WebDriverWait(driver, 5, 0.5).until(
		EC.presence_of_element_located((By.ID, "tcaptcha_drag_button"))
	)
	try:
		button = driver.find_element_by_id('tcaptcha_drag_button')
	except Exception as e:
		print 'get button failed: ', e
 
	sleep(1)
	# 开始拖动 perform()用来执行ActionChains中存储的行为
	flag = 0
	distance = 195
	offset = 5
	times = 0
	while 1:
		action = ActionChains(driver)
		action.click_and_hold(button).perform()
		action.reset_actions()	# 清除之前的action
		print distance
		track = get_track(distance)
		for i in track:
			action.move_by_offset(xoffset=i, yoffset=0).perform()
			action.reset_actions()
		sleep(0.5)
		action.release().perform()
		sleep(5)
 
		# 判断某元素是否被加载到DOM树里，并不代表该元素一定可见
		try:
			alert = driver.find_element_by_class_name('tcaptcha-title').text
		except Exception as e:
			print 'get alert error: %s' % e
			alert = ''
		if alert:
			print u'滑块位移需要调整: %s' % alert
			distance -= offset
			times += 1
			sleep(5)
		else:
			print '滑块验证通过'
			flag = 1
			driver.switch_to.parent_frame()    # 验证成功后跳回最外层页面
			break
 
	sleep(2)
	driver.quit()
	print "finish~~"
	return flag
 
if __name__ == '__main__':
	main()