String username = request.getParameter("username");//获取参数值

if (username != null && username.length() > 0) {

RequestDispatcher dispatcher =

getServletContext().getRequestDispatcher("/response");

//获取url为/response的servlet作为转发的对象

if (dispatcher != null) {

dispatcher.include(request, response);

//请求转发到response这个url对应的servlet

}

}

out.println("</body></html>");

}

}