攔截器如下：public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {    PrintWriter writer=response.getWriter();    response.setContentType("application/json;charset=UTF-8");    response.setCharacterEncoding("UTF-8");    writer.println("{\"language\":\"簡(jiǎn)體中文\"}");    writer.flush();    writer.close();    return false;}上面返回時(shí)，中文只顯示幾個(gè)問(wèn)號(hào)。Controller里返回的中文是不會(huì)亂碼的。什么回事呢？