您必须找出要从中提取源代码的urlLogin，aurlAuth和urlBd（网址正文）。 您可以使用Chrome或Firefox devtools（在Windows上为F12键）。

您有urlLogin，但aurlAuth可能有所不同，使用浏览器的devtool并进行实际登录，当您单击“登录”按钮时，您会在“网络”标签中看到请求的详细信息。 （不要忘记点击网络复选框）

import requests

urlLogin = 'https://example.com/jsp/login.jsp'
urlAuth = 'https://example.com/CheckLoginServlet'
urlBd = 'https://example.com/jsp/batchdownload.jsp'
payload = {
    "username": "username","password": "password"
}

# Session will be closed at the end of with block
with requests.Session() as s:
    s.get(urlLogin)
    headers = s.cookies.get_dict()
    print(f"Session cookies {headers}")
    # Use headers if you want to append your own headers to default
    r1 = s.post(urlAuth,data=payload,headers=headers)
    # Here header is optional,code could be 
    # r1 = s.post(urlAuth,data=payload) 
    print(f'MainFrame text:::: {r1.status_code}')  #200

    r2 = s.post(urlBd,data=payload)
    print(f'MainFrame text:::: {r2.status_code}')  #200
    print(f'MainFrame text:::: {r2.text}')  #page source

    # 3. Again cookies will be used through session to access batch download page
    r2 = s.post(config['access-url'])
    print(f'Batch Download status:::: {r2.status_code}')  #200
    source_code = r2.text
    # print(f'Batch Download source:::: {source_code}')