/**
     * 響應資料給前端
     */
    public static void sendJsonMessage(HttpServletResponse response, Object obj) throws IOException {

        response.setContentType("application/json; charset=utf-8");
        PrintWriter writer = response.getWriter();
        writer.print(gson.toJson(obj));
        writer.close();

        response.flushBuffer();

    }
 

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