如何在Spring Boot app中用Hibernate验证做Bean验证？

Question

我正在学习Spring Boot应用程序中的Hibernate验证，并且我有一个Rest控制器和一个POST方法。当我发出请求时，如果字段未成功验证，则客户端应收到 400 个错误请求，并在正文中显示类似“验证失败”的消息。我试着这样做，但信息没有来。

这是身体:

{
    "timestamp": "2020-06-06T07:56:11.377+00:00",
    "status": 400,
    "error": "Bad Request",
    "message": "",
    "path": "/ibantowallet"
}

在控制台日志中，我得到：

2020-06-06 10:56:11.371  WARN 7552 --- [nio-8080-exec-8] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public org.springframework.http.ResponseEntity com.dgs.demotrans.api.TransactionController.sendMoneyIbanToWallet(com.dgs.demotrans.request.IbanToWalletRequest): [Field error in object 'ibanToWalletRequest' on field 'fromIban': rejected value [FR9151000 0000 0123 4567 89]; codes [Pattern.ibanToWalletRequest.fromIban,Pattern.fromIban,Pattern.java.lang.String,Pattern]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [ibanToWalletRequest.fromIban,fromIban]; arguments []; default message [fromIban],[Ljavax.validation.constraints.Pattern$Flag;@3c555785,[a-zA-Z]{2}\d{2}[ ]\d{4}[ ]\d{4}[ ]\d{4}[ ]\d{4}[ ]\d{2}|DE\d{20}]; default message [IBAN validation failed]] ]

因此，消息是空的，我希望客户端收到特定消息“IBAN验证失败”或“请提供金额”等。我如何做到这一点？提前谢谢！

Answer 1

您必须创建一个＜code＞ControllerAdvice＜/code＞方法来处理＜code＞MethodArgumentNotValidException＜/code＜，这是由hibernate验证器抛出的错误，如下例所示：

    @ResponseStatus(BAD_REQUEST)
    @ResponseBody
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public CustomError methodArgumentNotValidException(MethodArgumentNotValidException ex) {
        BindingResult result = ex.getBindingResult();
        List<org.springframework.validation.FieldError> fieldErrors = result.getFieldErrors();
        return mapToCustomError(fieldErrors);
    }

或者可以在控制器方法中注入＜code＞BindingResult＜/code＞，并检查验证是否失败：

    @PostMapping("/ibantoiban")
    public ResponseEntity<String> sendMoneyIbanToIban(@Valid @RequestBody IbanToIbanRequest ibanToIbanRequest, BindingResult bindingResult) {
        if (bindingResult.hasErrors()) { /** handle error here */ }
        Transaction transaction = transactionService.sendMoneyIbanToIban(ibanToIbanRequest);

        HttpHeaders headers = new HttpHeaders();
        headers.add("Location", "/ibantoiban" + transaction.getTransactionId().toString());
        return new ResponseEntity(headers, HttpStatus.CREATED);
    }