protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>问卷</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>问卷</h1>");
String page = request.getParameter("page");//接收name为page的参数并赋值给字符串page
out.println("<form action='index.jsp' method='post'>");
if(page==null) {
out.println("问题一: <input name='p1q1' type='text' ><br>");
out.println("问题二: <input name='p1q2' type='text' ><br>");
out.println("<input name='page' type='submit' value='下一页'><br> ");//按钮,把页面切换到下一页
}else if("下一页".equals(page)) {
String p1q1 = request.getParameter("p1q1");
String p1q2 = request.getParameter("p1q2");
out.println("<input name='p1q1' type='hidden' value='"+p1q1+"' >");//隐藏域,用来发送参数到完成页
out.println("<input name='p1q2' type='hidden' value='"+p1q2+"' >");//隐藏域,用来发送参数到完成页
out.println("问题三: <input name='p2q1' type='text' ><br>");
out.println("<input name='page' type='submit' value='完成' ><br>");//按钮,把页面切换到完成页
}else if("完成".equals(page)) {//完成页,显示所有页面输入的参数
out.println(request.getParameter("p1q1")+"<br>");
out.println(request.getParameter("p1q2")+"<br>");
out.println(request.getParameter("p2q1")+"<br>");
}
out.println("</form>");
out.println("</body>");
out.println("</html>");
}