小组验证

Question

是否可以验证bean，确保在不实现自定义验证器的情况下，三个字段中至少有一个不为空？

所以：

public class Foo {

    @NotNull(groups = {AtLeastOne.class})
    private Bar b1;

    @NotNull(groups = {AtLeastOne.class})
    private Bar b2;

    @NotNull(groups = {AtLeastOne.class})
    private Bar b3;
}

但没有这些群体意味着我想一次性验证它们。我希望b1或b2或b3不为空。

干杯，

Answer 1

您需要注释@Validated。例如：

public class Foo {

    @NotNull(groups = {AtLeastOne.class})
    private Bar b1;

    @NotNull(groups = {AtLeastTwo.class})
    private Bar b2;

    @NotNull(groups = {AtLeastThree.class})
    private Bar b3;
}

@Validated(value=AtLeastOne.class)只会验证b1 @Validated(value=AtLeastTwo.class)只会验证b2

<强>更新

@NotAllNull(value={"b1", "b2", "b3"})
public class Foo {

    private Bar b1;

    private Bar b2;

    private Bar b3;
}

@Documented
@Constraint(validatedBy = NotAllNullValidator.class)
@Target( { ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface NotAllNull {
    String[] value;
}

public class NotAllNullValidator implements ConstraintValidator<NotAllNull, Object> {

    private String[] fields;

    @Override
    public void initialize(final NotAllNull constraintAnnotation) {
        fields = constraintAnnotation.value();
    }

    @Override
    public boolean isValid(final Object instance, final ConstraintValidatorContext context) {
        boolean result = false;
        for(int i = 0 ; i < fields.length; i++) {
            result |= org.apache.commons.beanutils.BeanUtils.getProperty(instance, fields[i])!=null;
        }
        return result;
    }
}

我这里没有IDE，代码中可能有一些错误，但希望你能看到代码背后的想法

Answer 2

看一下你班上的@Valid和@Validated注释