JSP页面无法获取参数，如何解决？(语言-java)

action="<%= request.getContextPath()%>/login?method=login" method="get">

jsp页面采用这个语句提交表单后method=login无法被servlet中的method.getparameter("method")方法获取到
求解决

这是jsp代码

<html>
<head>
    <title>Titletitle>
head>
<body>
    <form action="<%= request.getContextPath()%>/login?method=login" method="get">
        <input name="username" required="用户名">
        <input name="password" required="密码" type="password">
        <button type="submit">提交button>
    form>
    <div>${UsernameError}div>
    <div>${PasswordError}div>
body>
html>

这是servlet代码控制台打印method为空也就是拿不到method的值

@WebServlet("/login")
public class Adminloginservlet extends HttpServlet {

    private AdminserviceImp adminserviceImp = new AdminserviceImp();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String method = req.getParameter("method");
        System.out.println(method);
        switch (method){
            case "login":
                String username = req.getParameter("username");
                String password = req.getParameter("password");
                System.out.println(username);
                System.out.println(password);

                adminlogindto adminlogindto = this.adminserviceImp.login(username, password);
                if (adminlogindto.getCode() == -1){
                    req.setAttribute("UsernameError","用户名不存在");
                    req.getRequestDispatcher("login.jsp").forward(req,resp);
                } else if (adminlogindto.getCode() == 0) {
                    req.setAttribute("PasswordError","密码错误");
                    req.getRequestDispatcher("login.jsp").forward(req,resp);
                }else {
                    req.setAttribute("Success","欢迎进入");
                    HttpSession session = req.getSession();
                    session.setAttribute("Admin", adminlogindto.getAdmin());
                    resp.sendRedirect("admin.jsp");
                }

                break;

            case "logout":
                req.getSession().invalidate();
                resp.sendRedirect("/login.jsp");
                break;
        }


    }
}

换post试试，表单提交这个是post，get是向服务器获取数据

表单提交方式换post

其他参数能获取到吗，获取全部参数试试

获取下其他的参数，看看username和password能不能获取到