Micronaut自定义验证约束，根据值编写自定义消息

import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.validation.validator.constraints.ConstraintValidator;
import io.micronaut.validation.validator.constraints.ConstraintValidatorContext;

import javax.inject.Singleton;
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Retention(RUNTIME)
@Target({FIELD, METHOD, PARAMETER, ANNOTATION_TYPE})
@Constraint(validatedBy = CustomConstraintValidator.class)
public @interface CustomConstraint {
    String message() default "Invalid value";

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

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

@Singleton
public class CustomConstraintValidator implements ConstraintValidator<CustomConstraint, String> {
    @Override
    public boolean isValid(String value, AnnotationValue<CustomConstraint> annotationMetadata, ConstraintValidatorContext context) {
        // 自定义验证逻辑
        if (value == null || !value.startsWith("custom")) {
            context.buildConstraintViolationWithTemplate("Invalid value. Value must start with 'custom'").addConstraintViolation();
            return false;
        }
        return true;
    }
}

public class MyService {
    public void doSomething(@CustomConstraint String value) {
        // 执行业务逻辑
    }
}