springboot 攔截器返回json字符串給前端頁面

在intercept中加入以下代碼：

    private void returnJson(HttpServletResponse response, String json){
        PrintWriter writer = null;
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=utf-8");
        try {
            writer = response.getWriter();
            writer.print(json);

        } catch (IOException e) {
            LOGGER.error("response error",e);
        } finally {
            if (writer != null)
                writer.close();
        }
    }