SpringBoot后台管理系统 附源码！！

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//        登录成功后，有用户的session        Object loginUser = request.getSession().getAttribute("loginUser");        if (loginUser == null){            request.setAttribute("msgg","没有权限请先登录！");            request.getRequestDispatcher("/index.html").forward(request,response);            return false;        }else {            return true;        }    }    

//    查询    @RequestMapping("/emp")    public String list(Model model){        Collection<Emplyee> emplyees = emplyeeDAO.getAll();//获取所有员工|        Model emps = model.addAttribute("emps", emplyees);        return "/list";    }//    添加    @GetMapping("/toAdd")    public String toAdd(Model model){        Collection<Department> department = departmentDAO.getDepartment();        model.addAttribute("department",department);        return "/emp/toadd";    }//    添加页面    @PostMapping("/emps")    public String addEmp(Emplyee emplyee ){        emplyeeDAO.save(emplyee);//调用底层业务方法 保存员工信息        return "redirect:/emp";    }//    修改    @GetMapping("/emp/{id}")    public String toUpdateEmp(@PathVariable("id")Integer id,Model model){        Emplyee emplyeeByid = emplyeeDAO.getEmplyeeByid(id);        model.addAttribute("emp",emplyeeByid);//        查部门信息        Collection<Department> department = departmentDAO.getDepartment();        model.addAttribute("department",department);        return "emp/update";    }
//    去员工的修改页面    @PostMapping("/updateEmp")    public String updateEmp(Emplyee emplyee){        emplyeeDAO.save(emplyee);        return "redirect:/emp";    }
//    删除员工    @GetMapping("/delemp/{id}")    public String deleteEmp(@PathVariable("id")Integer id){         emplyeeDAO.delete(id);        return "redirect:/emp";    }