拦截器中通过response返回JSON数据

做接口的拦截器时，需在拦截器中通过response返回JSON信息

response.setCharacterEncoding( "UTF-8"); response.setContentType( "application/json; charset=utf-8"); PrintWriter out = null ; try{ JSONObject res = new JSONObject(); res.put( "status", "error"); res.put( "msg", "vin号错误，大于18位"); out = response.getWriter(); out.append(res.toString()); return false; } catch (Exception e){ e.printStackTrace(); response.sendError( 500); return false; }