java - 如何使用 OR 条件验证 2 个字段？

Question

我想验证请求类的两个字段，其中一个字段有效或另一个字段有效。

例如: 请求 Bean

public class CarRequest  {
    @NotEmpty
    private String customerName;
    @NotEmpty
    private String customerId;

---

Controller 方法

    public @ResponseBody CarResponse addCar(
            @ModelAttribute @Valid CarRequest request, BindingResult results)
            throws RuntimeException, ValidationException {
        if (results.hasErrors()) {
            LOG.error("error occured while adding the car");
            throw new ValidationException(
                    "Error Occoured while validiating car request");
        }
}

在这里，我想检查 customerName 是否应为 NotEmpty 或 customerId 是否应为 NotEmpty。那么我的验证应该通过。我怎样才能实现它。请推荐!!

Answer 1

您需要创建自定义 validator 来验证多个字段。

创建自定义注释:

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;

@Documented
@Constraint(validatedBy = CarRequestValidator.class)
@Target({ ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface RequestAnnotation {
    String message() default "{RequestAnnotation}";

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

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

创建自定义 validator :

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class CarRequestValidator implements 
                ConstraintValidator<RequestAnnotation, CarRequest> {

    @Override
    public void initialize(RequestAnnotation constraintAnnotation) {

    }

    @Override
    public boolean isValid(CarRequest value, ConstraintValidatorContext context) {
        // validation logic goes here
        return false;
    }
}

现在，使用自定义注释来注释您的模型:

@RequestAnnotation 
public class CarRequest  {
    private String customerName;
    private String customerId;
}