如何使用hibernate注释来验证枚举成员字段？
以下不起作用：
以下不起作用：
enum UserRole {
USER,ADMIN;
}
class User {
@NotBlank //HV000030: No validator could be found for type: UserRole.
UserRole userRole;
}
解决方法
注意,您还可以创建一个验证器来检查字符串是枚举的一部分.
public enum UserType { PERSON,COMPANY }
@NotNull
@StringEnumeration(enumClass = UserCivility.class)
private String title;
@Documented
@Constraint(validatedBy = StringEnumerationValidator.class)
@Target({ METHOD,FIELD,ANNOTATION_TYPE,PARAMETER,CONSTRUCTOR })
@Retention(RUNTIME)
public @interface StringEnumeration {
String message() default "{com.xxx.bean.validation.constraints.StringEnumeration.message}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
Class<? extends Enum<?>> enumClass();
}
public class StringEnumerationValidator implements ConstraintValidator<StringEnumeration,String> {
private Set<String> AVAILABLE_ENUM_NAMES;
@Override
public void initialize(StringEnumeration stringEnumeration) {
Class<? extends Enum<?>> enumSelected = stringEnumeration.enumClass();
//Set<? extends Enum<?>> enumInstances = EnumSet.allOf(enumSelected);
Set<? extends Enum<?>> enumInstances = Sets.newHashSet(enumSelected.getEnumConstants());
AVAILABLE_ENUM_NAMES = FluentIterable
.from(enumInstances)
.transform(PrimitiveGuavaFunctions.ENUM_TO_NAME)
.toSet();
}
@Override
public boolean isValid(String value,ConstraintValidatorContext context) {
if ( value == null ) {
return true;
} else {
return AVAILABLE_ENUM_NAMES.contains(value);
}
}
}
这是很好的,因为你不会松动“错误的价值”的信息.你可以得到一个消息
The value “someBadUserType” is not a valid UserType. Valid UserType
values are: PERSON,COMPANY
编辑
对于那些想要非番石榴版本的人来说,它应该像以下一样工作：
public class StringEnumerationValidator implements ConstraintValidator<StringEnumeration,String> {
private Set<String> AVAILABLE_ENUM_NAMES;
public static Set<String> getNamesSet(Class<? extends Enum<?>> e) {
Enum<?>[] enums = e.getEnumConstants();
String[] names = new String[enums.length];
for (int i = 0; i < enums.length; i++) {
names[i] = enums[i].name();
}
Set<String> mySet = new HashSet<String>(Arrays.asList(names));
return mySet;
}
@Override
public void initialize(StringEnumeration stringEnumeration) {
Class<? extends Enum<?>> enumSelected = stringEnumeration.enumClass();
AVAILABLE_ENUM_NAMES = getNamesSet(enumSelected);
}
@Override
public boolean isValid(String value,ConstraintValidatorContext context) {
if ( value == null ) {
return true;
} else {
return AVAILABLE_ENUM_NAMES.contains(value);
}
}
}
并自定义错误消息并显示适当的值,请检查：https://stackoverflow.com/a/19833921/82609
