新手上路之HttpSession中提前使会话失效的2调用方法 笔记

                                        *****会话失效*****

invalidate()：使会话失效，同时删除属性对象

setMaxInactiveInterval(int seconds)：允许客户客户请求的最长时间
默认30min.可以在servers文件中找到,如下图:

测试1代码(测试invalidate()方法) + 测试2代码:

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    //本来id的值:5302F0F3243CFCD446DA04F0AE42C4FE     HttpSession s1 = request.getSession();       //invalidate(),会话失效,下面这行代码输出是:    //一个新的会话id值:0A845ED2B86C722AE1E7F8BE1101FDEA     s1.invalidate();    //与上面区别,新建会话    //一个新的会话id值:    //0A845ED2B86C722AE1E7F8BE1101FDEA5CB0662BEE2E1BC66477D30D574F9AA5    s1 =request.getSession();    //默认30分钟,设置的时间适当即可    //刷新测试2代    //码,0A845ED2B86C722AE1E7F8BE1101FDEA5CB0662BEE2E1BC66477D30D574F9AA5    //4s后重新刷新测试2代码,新的id:     //379F5655ACB931DD54F82356BB80A117     //说明之前的会话失效     s1.setMaxInactiveInterval(4);

}

测试2代码(查看输出结果):

protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {

                   HttpSession s1 = request.getSession();                   System.out.println(s1.getId());}