1、接口注釋
@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER}) @Retention(RUNTIME) @Documented @Constraint(validatedBy = {IncrementalValidator. class }) public @ interface IncrementalInteger { String message() default "{common.incrementalInteger.Pattern}" ; Class <?>[] groups() default {}; Class <? extends Payload>[] payload() default {}; /** * @return value the element must be larger or equal to */ int min(); /** * @return value the element must be smaller or equal to */ int max(); /** * @return value must be incremental */ int increment(); /** * Defines several { @link IncrementalInteger} annotations on the same * element. * * @see IncrementalInteger */ @Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER}) @Retention(RUNTIME) @Documented @ interface List { IncrementalInteger[] value(); } }
2、Validator類
public class IncrementalValidator implements ConstraintValidator<IncrementalInteger, Integer> { private IncrementalInteger constraintAnnotation; @Override public void initialize(IncrementalInteger constraintAnnotation) { this .constraintAnnotation = constraintAnnotation; } @Override public boolean isValid(Integer value, ConstraintValidatorContext context) { int min = constraintAnnotation.min(); int increment = constraintAnnotation.increment(); int max = constraintAnnotation.max(); if (value < min) { return false ; } if (value > max) { return false ; } if ((value - min) % increment != 0 ) { return false ; } return true ; } }
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