Posted in Python onFebruary 06, 2020
本文实例讲述了Scrapy框架实现的登录网站操作。分享给大家供大家参考,具体如下:
一、使用cookies登录网站
import scrapy class LoginSpider(scrapy.Spider): name = 'login' allowed_domains = ['xxx.com'] start_urls = ['https://www.xxx.com/xx/'] cookies = "" def start_requests(self): for url in self.start_urls: yield scrapy.Request(url, cookies=self.cookies, callback=self.parse) def parse(self, response): with open("01login.html", "wb") as f: f.write(response.body)
二、发送post请求登录, 要手动解析网页获取登录参数
import scrapy class LoginSpider(scrapy.Spider): name='login_code' allowed_domains = ['xxx.com'] #1. 登录页面 start_urls = ['https://www.xxx.com/login/'] def parse(self, response): #2. 代码登录 login_url='https://www.xxx.com/login' formdata={ "username":"xxx", "pwd":"xxx", "formhash":response.xpath("//input[@id='formhash']/@value").extract_first(), "backurl":response.xpath("//input[@id='backurl']/@value").extract_first() } #3. 发送登录请求post yield scrapy.FormRequest(login_url, formdata=formdata, callback=self.parse_login) def parse_login(self, response): #4.访问目标页面 member_url="https://www.xxx.com/member" yield scrapy.Request(member_url, callback=self.parse_member) def parse_member(self, response): with open("02login.html",'wb') as f: f.write(response.body)
三、发送post请求登录, 自动解析网页获取登录参数
import scrapy class LoginSpider(scrapy.Spider): name='login_code2' allowed_domains = ['xxx.com'] #1. 登录页面 start_urls = ['https://www.xxx.com/login/'] def parse(self, response): #2. 代码登录 login_url='https://www.xxx.com/login' formdata={ "username":"xxx", "pwd":"xxx" } #3. 发送登录请求post yield scrapy.FormRequest.from_response( response, formxpath="//*[@id='login_pc']", formdata=formdata, method="POST", #覆盖之前的get请求 callback=self.parse_login ) def parse_login(self, response): #4.访问目标页面 member_url="https://www.xxx.com/member" yield scrapy.Request(member_url, callback=self.parse_member) def parse_member(self, response): with open("03login.html",'wb') as f: f.write(response.body)
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希望本文所述对大家基于Scrapy框架的Python程序设计有所帮助。
Scrapy框架实现的登录网站操作示例
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