public class Form extends HttpServlet {?private static final long serialVersionUID = 1L;??? /**???? * Default constructor. ???? */??? public Form() {??????? // TODO Auto-generated constructor stub??? }?/**? * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)? */?protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {??// TODO Auto-generated method stub??response.getWriter().append("Served at: ").append(request.getContextPath());?}?/**? * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)? */?protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {??// TODO Auto-generated method stub??response.setContentType("text/html;charset=utf-8");??response.setCharacterEncoding("utf-8");??PrintWriter writer = response.getWriter();??StringBuffer buffer = new StringBuffer();?/*?<form action=''>??username:<input type='text'>??password:<input type='text'>?</form>?*/??buffer.append("<form action=''>");??buffer.append("username:<input type='text'>");??buffer.append("password:<input type='text'>");??buffer.append("</form>");?}}