Java Bean Validation自定义注解

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

@Constraint(validatedBy = InValidator.class)
@Target({java.lang.annotation.ElementType.FIELD})
@Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
@Documented
public @interface In {
    //提示信息,可以写死,可以填写国际化的key
    String message() default "";

    int[] values() default {};

    //下面这两个属性必须添加
    Class<?>[] groups() default {};

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

public class InValidator implements ConstraintValidator<In, Integer> {
    private final Set<Integer> values = new HashSet<>();
    private String msg = null;
    @Override
    public void initialize(In constraintAnnotation) {
        for (int value : constraintAnnotation.values()) {
            this.values.add(value);
        }
        String msg = values.stream().map(Object::toString).collect(Collectors.joining(",", "[", "]"));
        this.msg = String.format("只能取值%s", msg);
    }

    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {
        if (value == null) {
            return true;
        }
        boolean contains = values.contains(value);
        if (contains) {
            return true;
        }

        if (context.getDefaultConstraintMessageTemplate().isEmpty()) {
            context.disableDefaultConstraintViolation();
            context.buildConstraintViolationWithTemplate(this.msg).addConstraintViolation();
        }
        return false;
    }
}

@Data
public class Person {
    @Null(message = "id should be empty")
    private Integer id;

    @Length(min = 2, max = 10, message = "name的长度为[2-10]之间")
    @NotBlank(message = "name should not be empty")
    private String name;

    @Min(18)
    @Max(130)
    private Integer age;

    @NotNull(message = "gender should not be empty")
    private Boolean gender;

    @Null(message = "createTime should be empty")
    private LocalDateTime createTime;

    @Null(message = "updateTime should be empty")
    private LocalDateTime updateTime;

    //这里是自定义注解，指定type只能是1或2
    @In(values = {1,2})
    private Integer type;
}

{
    "name": "tenmao",
    "gender": true,
    "type": 3
}

{
    "code": 400,
    "msg": "[只能取值[1,2]]",
    "data": null
}