HttpSession实现计数
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public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");PrintWriter out=response.getWriter();HttpSession session=request.getSession();Object count=session.getAttribute("COUNT");int counter=0;if (count==null) {counter=1;session.setAttribute("COUNT",new Integer(1));}else{counter=((Integer)count).intValue();counter++;session.setAttribute("COUNT", new Integer(counter));}out.print("访问了"+counter+"次!");}