带有java验证API的Spring RestController。错误消息太冗长

Question

    @PostMapping(value = "/mycontroller", produces = "application/json")
    @ResponseBody
    @ResponseStatus(HttpStatus.CREATED)
    public MyDTOOuptup myMethod(@Valid @RequestBody MyDTO input) {

        ... body ...
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class MyDTO {

        @NotNull(message="my custom error message for field_a")
        @JsonProperty("field_A")
        private String fieldA;

        @NotNull(message="my custom error message for field_b")
        @JsonProperty("field_B")
        private String fieldB;

    }

但是，我发现这个json体太冗长了。

    {
    "timestamp": "2020-03-31T14:29:42.401+0000",
    "status": 400,
    "error": "Bad Request",
    "errors": [
        {
            "codes": [
                "NotNull.myDTO.field_a",
                "NotNull.field_a",
                "NotNull.java.lang.String",
                "NotNull"
            ],
            "arguments": [
                {
                    "codes": [
                        "myDTO.field_a",
                        "field_a"
                    ],
                    "arguments": null,
                    "defaultMessage": "field_a",
                    "code": "field_a"
                }
            ],
            "defaultMessage": "my custom error message for field_a",
            "objectName": "myDTO",
            "field": "productId",
            "rejectedValue": null,
            "bindingFailure": false,
            "code": "NotNull"
        }
    ],
    "message": "Validation failed for object='myDTO'. Error count: 1",
    "path": "/mycontroller"
}

我如何指定我只需要错误描述消息或类似的东西？有灵巧/纤细的结构吗？

Answer 1

您可以定义自己的自定义异常并添加异常处理程序,

class ExceptionResponse {
    private boolean success = false;
    private String errorCode;
    private String errorMessage;
    private String exception;
    private List<String> errors;
    private String path;
    private String timestamp = LocalDateTime.now().toString();
}

异常处理程序,

@ControllerAdvice
public class CustomExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ExceptionResponse> invalidInput(MethodArgumentNotValidException ex, HttpServletRequest request) {

        ExceptionResponse response = getExceptionResponse(); //generate exception response

        return ResponseEntity.badRequest().contentType(MediaType.APPLICATION_JSON_UTF8).body(response);
    }
}

希望有帮助！！