@WebServlet("/hello")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String method =  req.getParameter("method");

        if(method.equals("add")){

            req.getSession().setAttribute("msg","执行了add 方法");

        }

        if(method.equals("delete")){
            req.getSession().setAttribute("msg","执行了delete方法");
        }

        //转发
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);
        //重定向
        // resp.sendRedirect();
    }

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


    }
}