spring boot HandlerInterceptor 返回json乱码问题

切记一定在设置response之后获取response.getWriter()，否则乱码

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
           String token = request.getParameter("token");
        if(StringUtils.isEmpty(token)){
            //转发
            PrintWriter writer = null;
            try {

                response.setCharacterEncoding(StandardCharsets.UTF_8.displayName());
                response.setContentType("application/json; charset=utf-8");
                ResponseData objectResponseData = ResponseData.newInstanceOfExceptionMsg(ExceptionMsg.LOGIN_INVALID_UTOKEN);
                String s = JsonUtils.toJSONString(objectResponseData);
                //TODO 一定要在response设置后再getWriter() 否则乱码，提前设置全部无效
                writer = response.getWriter();
                writer.append(s);
                writer.flush();
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                if (writer != null){
                    writer.close();
                }
            }
            return false;
        }
        return true;
    }