ssm项目：登录逻辑

UserController

    public String login(Model model, HttpSession session, @Param("username") String username,
                        @Param("password") String password){
        boolean login = userServiceImpl.Login(model, session, username, password);
        if (login){
            return "redirect:/index";
        }else {
            return "login";
        }
    }

RountController

    @RequestMapping("/index")
    public String index(HttpSession session,Model model) {
        User user = (User)session.getAttribute("loginUser");
        List<Borrowed> borroweds = borrowedServiceImpl.selectByUser(user.getID());
        System.out.println(borroweds);
        model.addAttribute("list",borroweds);
        return"index";
    }

这里要注意一下，加载主页/index的时候往里插入了数据，所以登陆成功要重定向到index。否则数据无法加载，freemaker的list会报空指针异常。
时间格式化

<td>${borrow.return_time?string("yyyy/MM/dd HH:mm:ss")}</td>