springboot拦截器返回json数据给前端

if(StringUtils.isEmpty(token)){
    response.setCharacterEncoding("UTF-8");
    response.setContentType("application/json; charset=utf-8");
    PrintWriter out = null;
    JSONObject res = new JSONObject();
    res.put("success", false);
    res.put("message", "请携带token");
    out = response.getWriter();
    out.append(res.toString());
    return false;
}

原文：https://www.cnblogs.com/zhangjiahao/p/12356644.html