application

Application

對應的類 ServletContext

用於保存整個WebApplication的生命週期內均可以訪問的數據

xx extends HttpServlet

ServletContext application = this.getServletContext();

//拿到全部客戶端的內存

//包括 Servlet 的整個容器

ServletContext application = this.getServletContext();

Object objValue = (Object) application.getAttribute("paramName"); application.setAttribute(" paramName ",  objValue);