Java实现自定义枚举值校验器的示例代码

@Getter
public enum UserTypeEnum {
    STUDENT(“1”, "学生"),
    TEACHER(“2”, "老师");
 
    private Integer code;
    private String name;
 
    UserTypeEnum(Integer code, String name) {
        this.code = code;
        this.name = name;
    }
}

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
@Constraint(validatedBy = EnumValidatorHandler.class)
public @interface EnumValidator {
    Class<?> value();
 
    String message() default "入参值不在正确枚举中";
    String method() default "getCode";
    Class<?>[] groups() default {};
 
    Class<? extends Payload>[] payload() default {};
}

@Slf4j
class EnumValidatorHandler implements ConstraintValidator<EnumValidator, Object> {
    private List<Object> values = new ArrayList<>();

    @Override
    public void initialize(EnumValidator enumValidator) {
        Class<?> clazz = enumValidator.value();
        Object[] objects = clazz.getEnumConstants();
        try {
            Method method = clazz.getMethod(enumValidator.method());
            Object value;
            for (Object obj : objects) {
                value = method.invoke(obj);
                values.add(value);
            }
        } catch (Exception e) {
            log.error("处理枚举校验异常:{}", e);
        }
    }

    @Override
    public boolean isValid(Object value, ConstraintValidatorContext constraintValidatorContext) {
        if (value instanceof String) {
            String valueStr = (String)value;
            return StringUtils.isEmpty(valueStr)|| values.contains(value);
        }
        return Objects.isNull(value) || values.contains(value);
    }
}

@Entity
public class User {
    @EnumValidator(value = UserTypeEnum.class)
    private String userType;
}

public User add(@Valid User user) {
}