JAVA高级面试进阶训练营视频教程

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通过java原生的@Valid注解和spring的@ControllerAdvice和@ExceptionHandler实现全局异常处理的方法：

controller中加入@Valid注解：

    @RequestMapping(value="/addCountry", method=RequestMethod.POST)
    public ResponseResult addCountry(@RequestBody @Valid Country country) {
        return null;
    }

接受entity中加入@NotNull注解：（验证还有很多，这里是举例说明）

    @NotNull(message = "countryname params must not be null.")
    private String countryname;

全局处理工具类加入@ControllerAdvice和@ExceptionHandler注解：

@ControllerAdvice
public class GlobalExceptionAdvisor {
    Logger logger = LoggerFactory.getLogger(GlobalExceptionAdvisor.class);

    /**
     * 提取Validator产生的异常错误
     * @param bindingResult
     * @return
     */
    private BaseException parseBindingResult(BindingResult bindingResult){
        Map<String,String> errorMsgs = new HashMap<String,String>();
        for (FieldError error:bindingResult.getFieldErrors()){
            errorMsgs.put(error.getField(),error.getDefaultMessage());
        }
        if(errorMsgs.isEmpty()) {
            return new IllegalParameterCommonException();
        }else {
            return new IllegalParameterCommonException(JsonUtils.toJSONString(errorMsgs));
        }
    }

    /**
     * 捕获@Validate校验抛出的异常
     * @param e
     * @param request
     * @param response
     * @return
     */
    @ExceptionHandler(BindException.class)
    @ResponseBody
    public ResponseResult validExceptionHandler(BindException e, HttpServletRequest request, HttpServletResponse response) {
        BaseException ex = parseBindingResult(e.getBindingResult());
        logger.error(ex.getMessage());
        return ResultUtil.error(ex);
    }

    /**
     * 捕获@Validate校验抛出的异常
     * @param e
     * @param request
     * @param response
     * @return
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseBody
    public ResponseResult validException2Handler(MethodArgumentNotValidException e, HttpServletRequest request, HttpServletResponse response) {
        BaseException ex = parseBindingResult(e.getBindingResult());
        logger.error(ex.getMessage());
        return ResultUtil.error(ex);
    }

    @ExceptionHandler(value = BaseException.class)
    @ResponseBody
    public ResponseResult gisExceptionHandler(HttpServletRequest req, BaseException e) throws Exception {
        logger.error(e.getMessage());
        return ResultUtil.error(e);
    }

    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public ResponseResult exceptionHandler(HttpServletRequest req, Exception e) throws Exception {
        logger.error(e.toString());
        return ResultUtil.error(new BaseException());
    }
}

　　

BaseException、ResponseResult等是自己封装的处理工具类。