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@ControllerAdvice
@ResponseBody
public class GlobalExceptionInterceptor {
    @ExceptionHandler(value = Exception.class)
    public String exceptionHandler(HttpServletRequest request, Exception e ) {
        String failMsg = null;
        if (e instanceof MethodArgumentNotValidException) {
            // 拿到参数校验具体异常信息提示
            failMsg = ((MethodArgumentNotValidException)e).getBindingResult().getFieldError().getDefaultMessage();
        }
        // 直接吐回给前端
        return failMsg;
    }
}