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您好，我是 Java 初学者，使用 SpringBoot 验证 javax 时遇到问题。我创建了自己的 ExceptionHandler 来处理验证异常：MethodArgumentNotValidException当请求无效时抛出。

无效的 JSON 请求示例：

{
    "code": "",
    "name": ""
}

控制器：

@Controller
@RequestMapping("/v1/api")
public class ApiController {

    @Autowired
    private Service service;

    @PostMapping("/")
    public ResponseEntity<?> returnHomePage(@Valid @RequestBody RequestDTO requestDTO) {
        return ResponseEntity.ok().body(service.getSomeData(requestDTO));
}

}

带有 javax 验证注释的类：

@Data
public class RequestDTO {
    @NotBlank(message = "Return code is a required field")
    @Size(min = 6, max = 10, message = "Return code must be in range 6-10 digits")
    @Pattern(regexp = "[\\d]{6,10}", message = "Return code must be numeric")
    private String code;
    @NotBlank(message = "Name is a required field")
    @Size(min = 1, max = 15, message = "Name must be in range 1-15 digits")
    private String name;

}

我的处理程序中的方法：

@ExceptionHandler(value = {MethodArgumentNotValidException.class})
public ResponseEntity<Object> handleBadRequestException(MethodArgumentNotValidException ex, WebRequest request) {
    List<String> errorMessages = new ArrayList<>();

    Map<String, List<String>> details = ex
        .getBindingResult()
        .getFieldErrors()
        .stream()
        .collect(Collectors.toMap(FieldError::getField, fieldError -> {
            errorMessages.add(fieldError.getDefaultMessage());
            return errorMessages;
        }, (key, duplicatedKey) -> key));

    ErrorMessage errorMessage = new ErrorMessage(HttpStatus.BAD_REQUEST.name().toLowerCase(), ex.getMessage(), details);
    return new ResponseEntity<>(errorMessage, HttpStatus.BAD_REQUEST);

错误消息类：

@Data
@AllArgsConstructor
public class ErrorMessage {
    private final String key;
    private final String msg;
    private final Map<String, List<String>> details;
}

我想要实现的是获得每个字段的嵌套验证错误，如下例所示：

{
    "key": "bad_request",
    "msg": "Validation errors occurred",
    "details": {
        "code": [
            "Return code must be numeric",
            "Return code must be in range 6-10 digits",
            "Return code is a required field",
        ],
        "name": [
            "Name must be in range 1-15 digits",
            "Name is a required field",
        ]
    }
}

我在这一点上得到了什么：

{
    "key": "bad_request",
    "msg": "Validation errors occurred",
    "details": {
        "code": [
            "Return code is a required field",
            "Name is a required field",
            "Return code must be in range 6-10 digits",
            "Name must be in range 1-15 digits",
            "Return code must be numeric"
        ],
        "name": [
            "Return code is a required field",
            "Name is a required field",
            "Return code must be in range 6-10 digits",
            "Name must be in range 1-15 digits",
            "Return code must be numeric"
        ]
    }
}

正如您所看到的，代码和名称键在这两个字段中都出现验证错误，这是错误的 :) 我将不胜感激任何帮助 :)

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0 回答 0