【expires】设置缓存时间

public class ServletDemo14 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String data="test expires cache";long expires=System.currentTimeMillis()+1*24*60*60*1000;response.setDateHeader("expires", expires);response.getWriter().write(data);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}