java application session request 使用示例

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application: 容器级别，关闭或停止容器，配置的数据才会清除

@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {ServletContext application = this.getServletContext();application.setAttribute("username", "yuanzhong");application.setAttribute("login", "老头");System.out.println(this.getServletContext().getInitParameter("user"));System.out.println("appliaction=username====="+this.getServletContext(). getAttribute("username"));System.out.println("appliaction=login====="+this.getServletContext(). getAttribute("login"));}

session: 浏览器级别，在没有任何情况的情况下，机制会根据session-tiemout 时间，自动清除session中的数据；

@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {PrintWriter outPrintWriter = resp.getWriter();HttpSession session = req.getSession();session.setAttribute("s_name", "明天还要上班");System.out.println("session==========="+req.getSession().getAttribute("s_name"));outPrintWriter.write("<br />");outPrintWriter.write("session==========="+req.getSession().getAttribute("s_name"));}

request：请求级别，请求过程中有效，请求结束失效；

/*request*/req.setAttribute("r_name", "乐凡子");System.out.println("request==============="+req.getAttribute("r_name"));outPrintWriter.write("<br />request==============="+req.getAttribute("r_name"));

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