后端异常统一捕捉

实现 HandlerExceptionResolver ，对自定义异常进行转换，对非自定义异常统一转化为自定义异常并打印日志

public class BizBusinessExceptionHandler implements HandlerExceptionResolver {
    private static final Logger logger = LogManager.LOGGER.getInstance();

    @Override
    public ModelAndView resolveException(HttpServletRequest request,
            HttpServletResponse response, Object o, Exception e) {
        BusinessException exception;
        ErrorRes errorRes;
        if (e instanceof BusinessException) {
            exception = (BusinessException) e;
            errorRes = ErrorRes.builder().errCode(exception.getErrorCode())
                    .errMsg(exception.getMessage()).build();
        } else {
            logger.error("unexpected exception!",e);
            exception = new BusinessException(ErrorCode.SYSTEM_ERROR);
            errorRes = ErrorRes.builder().errCode(exception.getErrorCode())
                    .errMsg(exception.getMessage()).build();
        }
        PrintWriter responseWriter = null;
        try {
            response.setContentType("application/json;");
            response.setCharacterEncoding("UTF-8");
            response.setStatus(Response.SC_OK);
            responseWriter = response.getWriter();
            responseWriter.write(JSON.toJSONString(errorRes));
            responseWriter.flush();
        } catch (IOException e1) {

        } finally {
            if (responseWriter != null) {
                responseWriter.close();
            }
        }
        return new ModelAndView();
    }
}