public class RtopExceptionHandler implements HandlerExceptionResolver{

    private static final Logger logger = LoggerFactory.getLogger(RtopExceptionHandler.class);


    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object o,
                                         Exception ex) {

        //处理buservice的异常
        response.setContentType("application/json");
        response.setCharacterEncoding("utf-8");

        if(ex instanceof AccessException) {
            if(BuserviceConstants.HANDLER_DIGEST_LOGGER.isInfoEnabled()) {
                BuserviceConstants.HANDLER_DIGEST_LOGGER.info("The current request failed, the reason:" + ex);
            }

            AccessException e = (AccessException)ex;
            String redirectUrl = e.getRedirectUrl();
            String requestURI = request.getRequestURI();
            if(StringUtils.endsWithIgnoreCase(requestURI, ".json")) {
                try {
                    ErrorCodeEnum errorCode = e.getErrorCode();
                    String buserviceErrorCode = errorCode == null? ErrorCodeEnum.UNKNOW.name():errorCode.name();
                    String buserviceErrorMsg = errorCode == null? ErrorCodeEnum.UNKNOW.getDescCn():errorCode.getDescCn();

                    RtopHttpResult result = RtopHttpResult.Failure(buserviceErrorCode, buserviceErrorMsg);

                    if(ErrorCodeEnum.USER_NOT_LOGIN == errorCode){
                        //如果返回的错误是用户未登录,则将请求强制改为success,为了防止前端弹框展示错误信息.由前端直接跳转到登录页面.
                        result.setSuccess(true);
                    }

                    PrintWriter pw = response.getWriter();
                    String callback = request.getParameter("callback");
                    if(StringUtil.isNotBlank(callback)) {
                        pw.print(callback + "(" + JSON.toJSONString(result) + ")");
                    } else {
                        pw.print(JSON.toJSON(result));
                    }

                    pw.close();
                } catch (Exception var13) {
                    BuserviceConstants.HANDLER_DIGEST_LOGGER.info("The current JSON request fails, intercepting failure:" + var13);
                }

            } else {
                return StringUtil.isNotBlank(redirectUrl)?this.returnPage("redirect:" + redirectUrl, ex, new ModelAndView()):this.returnPage("/error", ex, new ModelAndView());

            }
        }else if(ex instanceof ErrorCodeException){
            ErrorCodeException errorCodeException = (ErrorCodeException) ex;
            LoggerUtil.error(errorCodeException, "");

            String errorCode = errorCodeException.getErrorCode().getCode();
            String errorMsg = errorCodeException.getErrorCode().getMessage();
            RtopHttpResult result = RtopHttpResult.Failure(errorCode, errorMsg);

            try{
                PrintWriter pw = response.getWriter();
                pw.print(JSON.toJSON(result));
                pw.close();
            }catch (Exception e) {
                LoggerUtil.info(logger, "response in RtopExceptionHandler error" + e.getMessage());
            }

        }else if(ex instanceof RuntimeException){
            if(ex instanceof  IllegalStateException){
                return null;
            }
            LoggerUtil.error(ex, "");

            RtopHttpResult result = RtopHttpResult.Failure(RtopAppErrorCode.INTERNAL_ERROR);

            try{
                PrintWriter pw = response.getWriter();
                pw.print(JSON.toJSON(result));
                pw.close();
            }catch (Exception e) {
                LoggerUtil.info(logger, "response in RtopExceptionHandler error" + e.getMessage());
            }

        }

        return null;
    }

    public ModelAndView returnPage(String page, Exception ex, ModelAndView view) {
        view.addObject("exception", ex);
        view.setViewName(page);
        return view;
    }
}