java 后台代码如何对数据进行封装

1、@RequestMapping("/loginAction.do") public String loginAction(String username,String password,HttpServletRequest request){  User user = null;  try {   user = userService.login(username.trim(), password.trim());  } catch (NameorPwdException e) {  侵捧 // TODO Auto-generated catch block   e.printStackTrace();   } catch (NameorPwdEmptyException e) {   // TODO Auto-generated catch block   e.printStackTrace();   }

2、  HttpSession session = (HttpSession) request.getSession();  session.setAttribute("storePhone", user.getUserName());  session.setAttribute("user", user);  session.setAttribute("code", "");  return "redirect:sell.do"; }

3、@RequestMapping("/sell.do") public String sell(Model model,String phone,HttpServletRequest request){  HttpSession session = request.getSession();  String storePhone = (String) session.getAttribute("storePhone");  if(session.getAttribute("user")==null || ""盆败.equals(session.getAttribute("user"))){   return "redirect:/login/login.do";  粒宿悦}

1、public User  login(String name,String password) throws NameorPwdException, NameorPwdEmptyException{  if(name==null||"".equals(name.trim())||"".equals(password.trim())){   throw new NameorPwdEmptyException("用户名或密码不能为空");  }    User user = userDao.findByName(name);  if(user==null){   throw new NameorPwdException("用户名不存在");  } 

2、 if(user.getPassword().equalsIgnoreCase(password)){      return user;  }  System.out.println(name+"++"+password);  throw new NameorPwdException("密码错误"); }

3、public List<Seed> findAllSeed(){  List <Seed> seeds = seedDao.findAll();  return seeds; }

4、对登录异常统一处理封装；将数据封装实体对象，或者map集合传递到前端