Python 爬虫，scrapy，发送POST请求，发送表单提交POST请求 (登录)，scrapy.FormRequest

清疚 2022-03-25 08:45 400阅读 0赞

发送POST请求第一种方式：scrapy.Request(method="POST")

**项目名/spiders/爬虫名.py（爬虫，发送POST请求）：**

# -*- coding: utf-8 -*-
    import scrapy
    
    
    class Github2Spider(scrapy.Spider):
        name = '爬虫名'
        allowed_domains = ['github.com']
        start_urls = ['https://github.com/login']
    
        def parse(self, response):
            # 自动从response中寻找form表单,并发送请求
            yield scrapy.Request(
                "https://github.com/session",
                method="POST",  # 发送POST请求。 默认GET
                callback=self.parse
            )

发送POST请求第二种方式：scrapy.FormRequest()

**项目名/spiders/爬虫名.py（爬虫，scrapy.FormRequest发送POST请求）：**

# -*- coding: utf-8 -*-
    import scrapy
    
    
    class GithubSpider(scrapy.Spider):
        name = '爬虫名'
        allowed_domains = ['github.com']
        start_urls = ['https://github.com/login']
    
        def parse(self, response):
            post_data = dict(
                username="用户名",
                password="密码"
            )
            # FormRequest发送POST请求
            yield scrapy.FormRequest(
                "https://github.com/session",
                formdata=post_data,
                callback=self.after_login
            )
    
        def after_login(self,response):
            print(response.body.decode())

发送POST请求第二种方式：scrapy.FormRequest.from\_response() 自动寻找表单并发送POST请求提交

**项目名/spiders/爬虫名.py（爬虫，scrapy.FormRequest.from\_response()自动寻找表单并请求）：**

# -*- coding: utf-8 -*-
    import scrapy
    
    
    class GithubSpider(scrapy.Spider):
        name = '爬虫名'
        allowed_domains = ['github.com']
        start_urls = ['https://github.com/login']
    
        def parse(self, response):
            # 自动从response中寻找form表单,并发送请求
            yield scrapy.FormRequest.from_response(
                response,   # 自动从response中寻找form表单,并发送请求到表单action的url地址。
                # formid=None,    # 也可以通过id属性定位form表单
                # formname=None,  # 也可以通过name属性定位form表单
                # formxpath=None,  # 也可以通过XPath定位form表单
                formdata={"username":"用户名","password":"密码"},
                callback = self.after_login
            )
    
        def after_login(self,response):
            print(response.body.decode())