Spring 是如何捕捉校驗(yàn)參數(shù)異常并處理的？

@ControllerAdvice
public?class?WebExceptionHandler?{

???//處理Get請(qǐng)求中 使用@Valid 驗(yàn)證路徑中請(qǐng)求實(shí)體校驗(yàn)失敗后拋出的異常，詳情繼續(xù)往下看代碼
????@ExceptionHandler(BindException.class)
????@ResponseBody
????public?ResponseVO BindExceptionHandler(BindException e)?{
????????String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
????????return?new?ResponseVO(message);
????}

????//處理請(qǐng)求參數(shù)格式錯(cuò)誤 @RequestParam上validate失敗后拋出的異常是javax.validation.ConstraintViolationException
????@ExceptionHandler(ConstraintViolationException.class)
????@ResponseBody
????public?ResponseVO ConstraintViolationExceptionHandler(ConstraintViolationException e)?{
????????String message = e.getConstraintViolations().stream().map(ConstraintViolation::getMessage).collect(Collectors.joining());
????????return?new?ResponseVO(message);
????}

????//處理請(qǐng)求參數(shù)格式錯(cuò)誤 @RequestBody上validate失敗后拋出的異常是MethodArgumentNotValidException異常。
????@ExceptionHandler(MethodArgumentNotValidException.class)
????@ResponseBody
????public?ResponseVO MethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e)?{
????????String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
????????return?new?ResponseVO(message);
????}
}

@RestController
@RequestMapping("test")
public class TestController {

????@GetMapping("refund")
????public ResponseVO refund(@Valid?RefundRequest request) throws Exception {
????????return?new?ResponseVO();
????}
}

@Data
public?class?RefundRequest?implements?Serializable?{
????@NotBlank(message = "訂單號(hào)不能為空")
????private String orderId;
????@Min(value = 0, message = "已消費(fèi)金額金額不能為負(fù)數(shù)")
????private int orderAmt;
}

@Configuration
public?class?WebConfig?{
????@Bean
????public?Validator validator()?{
????????ValidatorFactory validatorFactory = Validation.byProvider(HibernateValidator.class)
????????????????.configure()
????????????????//failFast的意思只要出現(xiàn)校驗(yàn)失敗的情況，就立即結(jié)束校驗(yàn)，不再進(jìn)行后續(xù)的校驗(yàn)。
????????????????.failFast(true)
????????????????.buildValidatorFactory();

????????return?validatorFactory.getValidator();
????}

????@Bean
????public?MethodValidationPostProcessor methodValidationPostProcessor()?{
????????MethodValidationPostProcessor methodValidationPostProcessor = new?MethodValidationPostProcessor();
????????methodValidationPostProcessor.setValidator(validator());
????????return?methodValidationPostProcessor;
????}
}