public class UserHolder {
    public static final ThreadLocal<User> userThreadLocal = new ThreadLocal<>();
    public static void setValue(User user){
        userThreadLocal.set(user);
    }
    public static User getValue(){
        return userThreadLocal.get();
    }
    public static  void clear(){
        userThreadLocal.remove();
    }
}

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // 獲取 session
        HttpSession session = request.getSession();
        // 檢查用戶是否已登錄
        if (session.getAttribute("user") == null) {
            // 用戶未登錄，進(jìn)行相關(guān)處理
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 從 session 中獲取用戶數(shù)據(jù)
        User user = (User) session.getAttribute("user");
        // 將用戶數(shù)據(jù)存儲(chǔ)到 ThreadLocal 中，以便在整個(gè)請(qǐng)求周期內(nèi)訪問
        UserHolder.setValue(user);
        // 進(jìn)行其他邏輯驗(yàn)證，根據(jù)需求自行添加
        return true; // 允許請(qǐng)求繼續(xù)執(zhí)行
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        // 在請(qǐng)求處理之后執(zhí)行，可以對(duì) ModelAndView 進(jìn)行修改
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // 在請(qǐng)求完成之后執(zhí)行，用于資源清理等操作
        // 清理 ThreadLocal 中的用戶數(shù)據(jù)，防止內(nèi)存泄漏
        UserHolder.clear();
    }
}

@Configuration
public class MvcConfig implements WebMvcConfigurer {
    public void addInterceptors(InterceptorRegistry registry) {
        // 添加攔截器
        // excludePath 就是排除在外被攔截的路徑
        registry.addInterceptor(new LoginInterceptor())
            	.addPathPatterns("/**")  
                .excludePathPatterns(
                        "/user/login"
                );
    }
}

@RestController
@RequestMapping("/user")
public class UserController {
    @Resource
    private UserService userService;
    @PostMapping("/login")
    public BaseResponse<User> login(HttpSession session){
        System.out.println("Hello");
        Random random = new Random(new Date().getTime()) ;
        User user = new User(random.nextLong(), "123","123454","123");
        session.setAttribute("user",user);
        return ResultUtils.success(user);
    }
    @GetMapping("/get")
    public BaseResponse<User> get(){
        return ResultUtils.success(UserHolder.getValue());
    }
}