如何在请求正文 Spring Boot Rest Controller 中指定订单验证

Question

所以我在Spring Boot 中有一个Rest Controller，对于端点，我需要验证它的Request Body。

控制器：

@RestController
@Validated
@RequestMapping("/my_endpoint")
public class WorkflowController {

    @PostMapping(value = "/blablabla/", consumes = MediaType.APPLICATION_JSON_VALUE)
    public List<Object> createDisconnectRequestRest(@RequestBody List<@CustomValidator @Valid RequestObj> dtos) { // here at the validators is the question
        ... //nevermind
       return null;
    }

请求对象：

@Data
public class RequestObj{

    private String comment;

    @NotNull // this @NotNull annotation validator is triggered AFTER the custom validator is done. I want this to be first validated and then the custom validator should take place
    private List<Long> ids = new ArrayList<>();
}



@Target({FIELD, TYPE_USE})
@Retention(RUNTIME)
@Constraint(validatedBy = CustomValidator.class)
@Documented
public @interface ValidRequest {

    String message() default "Invalid request";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

自定义验证器：

public class CustomValidator implements ConstraintValidator<ValidRequest, RequestObj> {

 // repositories, constructor 

    @Override
    public boolean isValid(RequestObj request, ConstraintValidatorContext constraintValidatorContext) {
     
         myRepository.findAllById(request.getIds()); // I want the @NotNull annotation validate the object before this custom validator

        return true;
    }
}

这是问题：

要触发的第一个是 CustomValidator，然后正在验证 RequestObj。换句话说，验证从@CustomValidator 注释开始，然后是@Valid 注释。我希望第一个被触发的是@Valid 注释（所以@NotNull 注释将首先验证对象）然后@CustomValidator 应该完成它的工作。例如，如果 body 字段 ids 为 NULL，我希望 @CustomValidator 甚至无法启动，因为验证已经失败。

Answer 1

这可能是因为您在类级别应用了@CustomValidator 注释，并且类在属性之前首先加载，这可能是您看到此顺序或执行的原因。

你有几个选择：

1- 在特定属性级别应用此 @CustomValidator，

2- 将您的CustomValidator 设置为@Component，并从类级别中删除@CustomValidator 注释。然后在您的控制器方法中执行以下操作：

   @Autowired
   private CustomValidator customValidator;

    @PostMapping(value = "/blablabla/", consumes = MediaType.APPLICATION_JSON_VALUE)
    public List<Object> createDisconnectRequestRest(@RequestBody List<@Valid RequestObj> dtos) { // here at the validators is the question
        customValidator.validate(xyz);
    }

--- 未经检验的理论 ---

您能否尝试更改在方法级别应用的注释的顺序，看看是否有所不同：

@PostMapping(value = "/blablabla/", consumes = MediaType.APPLICATION_JSON_VALUE)
public List<Object> createDisconnectRequestRest(@RequestBody List<@Valid @CustomValidator RequestObj> dtos) { // here at the validators is the question
    ... //nevermind
   return null;
}