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I made a login today and saved it with session in the background. I don’t know why I can’t get it and it’s still null.

@ResponseBody
@RequestMapping("/ueserLogin")
public Object ueserLogin(Model model){
    Users userss;    
    System.out.println(request.getParameter("user_number"));
    if(request.getParameter("user_number")!=null && request.getParameter("user_number")!=""){
        userss=userbiz.findUserByNume(request.getParameter("user_number"));
        if(userss!=null){
            //這里我用session保存
            request.getSession().setAttribute("users", userss);
            //輸出是null ![圖片描述][1]
            System.out.println(request.getParameter("users"));
            //還強(qiáng)轉(zhuǎn)不了為對(duì)象
            //(Users)request.getParameter("users");
            return JSON.toJSONString(userss);
        }else{
            return "no";
        }
    }else{
        System.out.println("賬號(hào)不能為空！");
        return "no";
    }
}