java - 如何在 Spring Boot 中验证 Rest 请求

Question

我正在尝试根据某些字段的存在来验证我的休息请求。例如，如果 transactionDate 字段为 null 或我的请求对象中不存在，我想向客户端抛出错误。

尽管有本指南的来源，但我无法做到这一点，但我的请求仍然可以在 Controller 中传递。

How can I validate two or more fields in combination?

DTO

@FraudRestRequestValidator
public class FraudActionsRestRequest {
private BigDecimal amount;
    private String receiverTransactionDate;
    private String receiverNameSurname;
    private BigDecimal exchangeRate;
    private String transactionReferenceNumber;
    @NotNull
    private String transactionDate;
    @NotNull
    private String transactionTime;
    private String transactionTimeMilliseconds;
    private BigDecimal tlAmount;
    private String channel;
}

注释

@Constraint(validatedBy = FraudActionsRestValidator.class)
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface FraudRestRequestValidator {
    String message() default "Invalid Limit of Code";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

validator

public class FraudActionsRestValidator implements ConstraintValidator<FraudRestRequestValidator, FraudActionsRestRequest> {

    @Override
    public void initialize(FraudRestRequestValidator constraintAnnotation) {

    }

    @Override
    public boolean isValid(FraudActionsRestRequest fraudActionsRestRequest, ConstraintValidatorContext constraintValidatorContext) {
        //I will implement my logic in future
        return false;
    }
}

休息 Controller

@PostMapping("/getFraudActions")
    public ResponseEntity<?> getFraudActions(@Valid @RequestBody FraudActionsRestRequest fraudActionsRestRequest, Errors errors) throws Exception

谢谢。

Answer 1

在您的自定义 validator 中，只需实现您想要的逻辑即可。除了一些小事情之外，您所做的一切都是正确的:

@Constraint(validatedBy = FraudActionsRestValidator.class)
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ValidFraudRestRequest {
    String message() default "Invalid Limit of Code";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

public class FraudActionsRestValidator implements ConstraintValidator<ValidFraudRestRequest, FraudActionsRestRequest> {

    @Override
    public void initialize(ValidFraudRestRequest constraintAnnotation) {

    }

    @Override
    public boolean isValid(FraudActionsRestRequest fraudActionsRestRequest, ConstraintValidatorContext constraintValidatorContext) {

        return fraudActionsRestRequest.getTransactionDate() != null && fraudActionsRestRequest.getTransactionTime() != null && additional check you need;
    }
}