public class LoginInterceptor implements HandlerInterceptor {
    ......
    @Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg) throws Exception {
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");

		boolean allowGoing = true;
		String token = request.getHeader("Authorization");
		ResponseResult result = new ResponseResult();

		String uri = request.getRequestURI();
		if (!uri.endsWith("/login")) {
			if (StringUtils.isEmpty(token)) {
				handleNotAuthenticated(result, response);
				allowGoing = false;
			} else {
				Object obj = CacheUtil.getUser(token);

				if (null == obj) {
					handleNotAuthenticated(result, response);
					allowGoing = false;
				}
			}
		}

		return allowGoing;
	}
    public void handleNotAuthenticated(ResponseResult result, HttpServletResponse response) throws JsonProcessingException {
		result.setSuccess(false);
		result.setObj("Not Authenticated");
		result.setMsg("请先登录");

		ObjectMapper mapper = new ObjectMapper();
		String json = mapper.writeValueAsString(j);

		PrintWriter writer = null;
		try {
			writer = response.getWriter();
			writer.print(json);
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (writer != null) {
				writer.close();
			}
		}
	}
    ......
}