關於自定義過濾器獲取不到session問題

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    /**
     * 註冊攔截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**.html").excludePathPatterns("/Ylogin.html","/Yindex.html","/YRegister.html");
    }
}

public class MyInterceptor implements HandlerInterceptor {
    //在請求處理之前進行調用（Controller方法調用之前
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("開始請求地址攔截");
        //獲取session
        HttpSession session = httpServletRequest.getSession();
        if (session.getAttribute("user") != null)
            return true;
        httpServletResponse.sendRedirect("/Ylogin.html");
            return false;
    }
    //請求處理之後進行調用，但是在視圖被渲染之前（Controller方法調用之後）
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle被調用");
    }
    //在整個請求結束之後被調用，也就是在DispatcherServlet 渲染瞭對應的視圖之後執行（主要是用於進行資源清理工作）
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion被調用");
    }
}

$.ajax({
            type: "POST",
            url: "/user/doLogin",
            dataType: "json",
            data:user,
            async:false,
            success: function(res) {}
            })