java中Session的简单使用

注意:服务器重启后之前存储的session会自动失效

通常用来做缓存,后面被redis取代...

 @GetMapping("/t2")
    public String down1(HttpServletRequest request) throws Exception {
        //存储session
        request.getSession().setAttribute("kkkk","986545");
        String kkkk = request.getSession().getAttribute("kkkk")==null?"空":request.getSession().getAttribute("kkkk").toString();
        return kkkk;
    }

    @GetMapping("/t3")
    public String down2(HttpServletRequest request) throws Exception {
        //查询session,删除后不可以直接查出来
        String kkkk = request.getSession().getAttribute("kkkk")==null?"空":request.getSession().getAttribute("kkkk").toString();
        return kkkk;
    }

    @GetMapping("/t4")
    public String down3(HttpServletRequest request) throws Exception {
        //删除session
        request.getSession().removeAttribute("kkkk");
        return "删除成功";
    }