session可以通过request.getSession();来获取
application可以通过this.getServletContext() 或 request.getSession.getServletContext()来获取
1 public class ServletTest extends HttpServlet { 2 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 3 HttpSession session = request.getSession(); 4 ServletContext application = this.getServletContext(); 5 } 6 }