以百度为例

1.首先确定我们需要的参数即百度的cookies需要什么参数才能识别为已登录状态.

通过百度我们得知只要下图中的参数即可实现登录状态

实例​​​​​​​

public class Test5 {
    public static void main(String[] args) {
        WebDriver driver = getChromeDriver();
        driver.manage().window().maximize();
        driver.get("https://www.baidu.com/");
        sleep();
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Cookie cookie = null;
        try {
//            cookie = new Cookie("BDUSS", "~NTaxMfE6sfvzOwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHAeR2BwHkdgN");//不增加cookies过期日期
            cookie = new Cookie("BDUSS", "W8wbFo1RFd3fjBX5aa0ZmSU5MM0wYXdpQVY5bmN6dERFSldpflhrOXdxMjVnRVFBQUFBJCQAAAAAAAAAAAEAAAC9HkU30sXN~NTaxMfE6sfvzOwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHAeR2BwHkdgN", "www.baidu.com", "/", df.parse("2021-08-07"));//增加过期日期为2021-08-07
        } catch (Exception e) {
            e.printStackTrace();
        }
        driver.manage().addCookie(cookie);//添加cookies
        driver.navigate().refresh();//刷新看看是否登录
        driver.get("https://www.baidu.com/");
        sleep();
        System.out.println(driver.manage().getCookieNamed("BDUSS"));//根据key获取value
        System.out.println(driver.manage().getCookies());//获取所有的cookies
    }

    private static void sleep() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }




}

cookies的值来自于浏览器登录后F12 查看所得