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from scrapy.http import FormRequest

class FormMiddleware:
    def process_request(self, request, spider):
        if hasattr(spider, 'form_data'):
            form_data = spider.form_data
            if isinstance(request, FormRequest):
                form_data.update(request.formdata)
            request = request.replace(formdata=form_data)
        return None

# 灏嗚嚜瀹氫箟middleware娣诲姞鍒癝crapy鐨凞OWNLOADER_MIDDLEWARES閰嶇疆涓?/span>
DOWNLOADER_MIDDLEWARES = {
    'myproject.middlewares.FormMiddleware': 543,
}

# 鍦⊿pider涓畾涔夎〃鍗曟暟鎹?/span>
class MySpider(scrapy.Spider):
    name = 'myspider'
    start_urls = ['http://example.com']

    form_data = {
        'username': 'myusername',
        'password': 'mypassword',
    }

    def parse(self, response):
        # 鍦ㄨ繖閲屽鐞嗚〃鍗曟彁浜ょ瓑鎿嶄綔
        pass

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