public class AServlet extends HttpServlet {
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                response.setContentType("text/html;charset=utf-8");
                String username = request.getParameter("username");
                response.getWriter().println(username);
        }

        public void doPost(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                response.setContentType("text/html;charset=utf-8");
                String username = request.getParameter("username");
                response.getWriter().println(username);
        }
}

public class AServlet extends HttpServlet {
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                response.setContentType("text/html;charset=utf-8");
                String username = request.getParameter("username");
                response.getWriter().println(username);
        }

        public void doPost(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                response.setContentType("text/html;charset=utf-8");
                String username = request.getParameter("username");
                response.getWriter().println(username);
        }
}