gregg
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•Created by gregg on 1/7/2025 in #java-help
annotation
Code：
@Documented
@Constraint(validatedBy = StringContainsValidator.class)
@Target({ElementType.PARAMETER, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface StringContains {
String message() default "字符串不符合规则";
String[] limitValues() default {};
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class StringContainsValidator implements ConstraintValidator<StringContains, String> {
private Set<String> limitValues;
@Override
public void initialize(StringContains constraintAnnotation) {
limitValues = Arrays.stream(constraintAnnotation.limitValues()).collect(Collectors.toSet());
}
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
if (StrUtil.isBlank(value)) {
return true;
}
return limitValues.contains(value.trim());
}
}
problem：How is the value in the message called when a string that does not meet the requirements is detected?
5 replies