帮我用springboot按照以下要求写一个简单的代码 解决问题：模拟一个图书馆座位预约管理系统，实现图书馆座位的预约申请 和日常管理等内容。 功能如下: (1) 系统管理：包括系统管理员管理、图书馆教师账号管理、自习室管理员、 学生账号管理。 (2) 座位管理：包括图书馆自习室管理、自习室座位管理。 (3) 座位预约管理：学生预约座位的申请、审批和签到等操作【座位预约申 请是学生发起申请、审批必须由“图书馆教师”审核通过才算审批通过、签到可 以自习室管理员操作，连续 3 次预约通过未成功签到或过期，惩罚一个月内容不 能预约座位

好的，我可以为您提供一个简单的SpringBoot代码示例，实现图书馆座位预约管理系统的部分功能。请注意，由于时间和篇幅的限制，此示例仅包括一些基本的功能，而不是完整的系统。

首先，我们需要创建一个基本的SpringBoot应用程序。您可以使用Spring Initializr或使用您喜欢的IDE来完成此操作。在这个示例中，我们将使用IntelliJ IDEA。

创建项目后，我们需要创建一些实体类来表示系统中的用户、座位和预约。

User.java

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String username;
    private String password;
    private UserType type;
    
    // getters and setters
}

enum UserType {
    ADMIN, TEACHER, MANAGER, STUDENT
}

Seat.java

@Entity
public class Seat {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String description;
    private SeatStatus status;
    
    // getters and setters
}

enum SeatStatus {
    AVAILABLE, RESERVED, OCCUPIED
}

Appointment.java

@Entity
public class Appointment {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @ManyToOne
    private User student;
    @ManyToOne
    private User teacher;
    @ManyToOne
    private Seat seat;
    private LocalDateTime startTime;
    private LocalDateTime endTime;
    private AppointmentStatus status;
    
    // getters and setters
}

enum AppointmentStatus {
    PENDING, APPROVED, REJECTED, CANCELED, CHECKED_IN, EXPIRED
}

接下来，我们需要创建一些Repository接口来处理实体类的持久化操作。

UserRepository.java

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByUsername(String username);
}

SeatRepository.java

@Repository
public interface SeatRepository extends JpaRepository<Seat, Long> {
    List<Seat> findByStatus(SeatStatus status);
}

AppointmentRepository.java

@Repository
public interface AppointmentRepository extends JpaRepository<Appointment, Long> {
    List<Appointment> findByStudentAndStatusIn(User student, List<AppointmentStatus> statuses);
    List<Appointment> findByTeacherAndStatus(AppointmentStatus status);
    List<Appointment> findBySeatAndStatusIn(Seat seat, List<AppointmentStatus> statuses);
}

然后，我们需要创建一些Service类来处理业务逻辑。

UserService.java

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    
    public User getUserByUsername(String username) {
        return userRepository.findByUsername(username).orElse(null);
    }
    
    public User addUser(User user) {
        return userRepository.save(user);
    }
    
    public void deleteUser(Long id) {
        userRepository.deleteById(id);
    }
    
    public List<User> getAllUsers() {
        return userRepository.findAll();
    }
}

SeatService.java

@Service
public class SeatService {
    @Autowired
    private SeatRepository seatRepository;
    
    public Seat getSeatById(Long id) {
        return seatRepository.findById(id).orElse(null);
    }
    
    public Seat addSeat(Seat seat) {
        return seatRepository.save(seat);
    }
    
    public void deleteSeat(Long id) {
        seatRepository.deleteById(id);
    }
    
    public List<Seat> getAllSeats() {
        return seatRepository.findAll();
    }
    
    public List<Seat> getAvailableSeats() {
        return seatRepository.findByStatus(SeatStatus.AVAILABLE);
    }
    
    public List<Seat> getReservedSeats() {
        return seatRepository.findByStatus(SeatStatus.RESERVED);
    }
    
    public List<Seat> getOccupiedSeats() {
        return seatRepository.findByStatus(SeatStatus.OCCUPIED);
    }
}

AppointmentService.java

@Service
public class AppointmentService {
    @Autowired
    private AppointmentRepository appointmentRepository;
    
    public Appointment getAppointmentById(Long id) {
        return appointmentRepository.findById(id).orElse(null);
    }
    
    public Appointment addAppointment(Appointment appointment) {
        return appointmentRepository.save(appointment);
    }
    
    public void deleteAppointment(Long id) {
        appointmentRepository.deleteById(id);
    }
    
    public List<Appointment> getAppointmentsByStudentAndStatusIn(User student, List<AppointmentStatus> statuses) {
        return appointmentRepository.findByStudentAndStatusIn(student, statuses);
    }
    
    public List<Appointment> getAppointmentsByTeacherAndStatus(User teacher, AppointmentStatus status) {
        return appointmentRepository.findByTeacherAndStatus(teacher, status);
    }
    
    public List<Appointment> getAppointmentsBySeatAndStatusIn(Seat seat, List<AppointmentStatus> statuses) {
        return appointmentRepository.findBySeatAndStatusIn(seat, statuses);
    }
}

最后，我们需要创建一些Controller类来处理HTTP请求。

UserController.java

@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;
    
    @GetMapping("/{id}")
    public User getUserById(@PathVariable Long id) {
        return userService.getUserById(id);
    }
    
    @GetMapping
    public List<User> getAllUsers() {
        return userService.getAllUsers();
    }
    
    @PostMapping
    public User addUser(@RequestBody User user) {
        return userService.addUser(user);
    }
    
    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable Long id) {
        userService.deleteUser(id);
    }
}

SeatController.java

@RestController
@RequestMapping("/seats")
public class SeatController {
    @Autowired
    private SeatService seatService;
    
    @GetMapping("/{id}")
    public Seat getSeatById(@PathVariable Long id) {
        return seatService.getSeatById(id);
    }
    
    @GetMapping
    public List<Seat> getAllSeats() {
        return seatService.getAllSeats();
    }
    
    @PostMapping
    public Seat addSeat(@RequestBody Seat seat) {
        return seatService.addSeat(seat);
    }
    
    @DeleteMapping("/{id}")
    public void deleteSeat(@PathVariable Long id) {
        seatService.deleteSeat(id);
    }
    
    @GetMapping("/available")
    public List<Seat> getAvailableSeats() {
        return seatService.getAvailableSeats();
    }
    
    @GetMapping("/reserved")
    public List<Seat> getReservedSeats() {
        return seatService.getReservedSeats();
    }
    
    @GetMapping("/occupied")
    public List<Seat> getOccupiedSeats() {
        return seatService.getOccupiedSeats();
    }
}

AppointmentController.java

@RestController
@RequestMapping("/appointments")
public class AppointmentController {
    @Autowired
    private AppointmentService appointmentService;
    
    @GetMapping("/{id}")
    public Appointment getAppointmentById(@PathVariable Long id) {
        return appointmentService.getAppointmentById(id);
    }
    
    @GetMapping("/student/{id}")
    public List<Appointment> getAppointmentsByStudentId(@PathVariable Long id) {
        User student = new User();
        student.setId(id);
        return appointmentService.getAppointmentsByStudentAndStatusIn(student, Arrays.asList(AppointmentStatus.PENDING, AppointmentStatus.APPROVED, AppointmentStatus.CHECKED_IN));
    }
    
    @GetMapping("/teacher/{id}")
    public List<Appointment> getAppointmentsByTeacherId(@PathVariable Long id) {
        User teacher = new User();
        teacher.setId(id);
        return appointmentService.getAppointmentsByTeacherAndStatus(teacher, AppointmentStatus.APPROVED);
    }
    
    @GetMapping("/seat/{id}")
    public List<Appointment> getAppointmentsBySeatId(@PathVariable Long id) {
        Seat seat = new Seat();
        seat.setId(id);
        return appointmentService.getAppointmentsBySeatAndStatusIn(seat, Arrays.asList(AppointmentStatus.PENDING, AppointmentStatus.APPROVED, AppointmentStatus.CHECKED_IN));
    }
    
    @PostMapping
    public Appointment addAppointment(@RequestBody Appointment appointment) {
        return appointmentService.addAppointment(appointment);
    }
    
    @DeleteMapping("/{id}")
    public void deleteAppointment(@PathVariable Long id) {
        appointmentService.deleteAppointment(id);
    }
}

这是一个简单的SpringBoot示例，实现了图书馆座位预约管理系统的部分功能。当然，这还远远不够完整和实用。如果您需要更全面和完整的系统，请在实现时考虑更多的细节和功能。