自定义注解

//元注解：注解作用目标
@Target(ElementType.METHOD)
//元注解：注解保留时长
@Retention(RetentionPolicy.RUNTIME)
public @interface LoginRequired {
    //逻辑代码
}

自定义注解+拦截器组合使用来达到验证的效果

要拦截的方法上添加自定义注解即可

拦截器代码

@Component
public class LoginRequiredInterceptor implements HandlerInterceptor {

    @Autowired
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            LoginRequired loginRequired = method.getAnnotation(LoginRequired.class);
            if (loginRequired != null && hostHolder.getUser() == null) {
                response.sendRedirect(request.getContextPath() + "/login");
                return false;
            }
        }
        return true;
    }
}