登录模块

Git 地址:https://github.com/705645051/vip

1. 添加login.jsp和index.jsp等文件

（代码略）

2. 添加视图文件

@Controller
public class PageController {

    @RequestMapping("/page/login.do")
    public String getLogin(){
        return "login" ;
    }

    @RequestMapping("/page/index.do")
    public String getIndex(){
        return "index" ;
    }

}

@Controller
public class UserController {

    @Autowired
    UserService userService ;

    @RequestMapping("/login.do")
    public String login(@RequestParam("username") String username, @RequestParam("password")  String password, Model model){
        System.out.println("UserController login username : " + username);
        System.out.println("UserController login password : " + password);
        if(!userService.login(username,password)){
            model.addAttribute("error","用户名不存在或密码错误") ;
            return "redirect:/page/login.do" ;
        }
        return "redirect:/page/index.do" ;
    }

}

3. 添加业务层代码

@Service
public class UserService {

    @Autowired
    UserMapper userMapper ;

    public boolean login(String username,String password){
        UserExample userExample = new UserExample() ;
        userExample
                .createCriteria()
                .andAccountEqualTo(username)
                .andPasswordEqualTo(password) ;
        List<User> userList = userMapper.selectByExample(userExample) ;
        return userList != null && userList.size() > 0 ;
    }

}

4. 登录界面演示