SpringMVC自定义拦截器拦截请求后返回中文时乱码？

拦截器如下：

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { PrintWriter writer=response.getWriter(); response.setContentType("applicatio优艾设计网_Photoshop论坛n/json;charset=UTF-8"); response.setCharacterEncoding("UTF-8"); writer.println("{"language":"简体中文"}"); writer.flush(); writer.close(); return false; }

上面返回时，中文只显示几个问号。Controller里返回的中文是不会乱码的。什么回事呢？