如何删除Spring Boot中的重复代码

public class FileUtils {
    public static boolean isFileEmpty(File file) {
        return file == null || !file.exists() || file.length() == 0;
    }
}

public abstract class BaseService<T> {
    public T findById(Long id) {
        // 公共查找逻辑
    }
}

public class UserService extends BaseService<User> {
    // 用户特有的逻辑
}

public interface Repository<T> {
    T findById(Long id);
}

@Repository
public class UserRepository implements Repository<User> {
    @Override
    public User findById(Long id) {
        // 实现细节
    }
}

@Aspect
@Component
public class LoggingAspect {
    @Before("execution(* com.example.service.*.*(..))")
    public void logBefore(JoinPoint joinPoint) {
        System.out.println("Entering method: " + joinPoint.getSignature().getName());
    }
}

@RestController
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/user/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.findById(id);
    }
}

@RestController
public class AdminController {
    @Autowired
    private UserService userService;

    @GetMapping("/admin/user/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.findById(id);
    }
}

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.findById(id);
    }
}

@RestController
@RequestMapping("/admin/user")
public class AdminController extends UserController {
    // 可以直接使用父类的getUser方法
}