我如何使用Hibernate注释来验证枚举成员字段? 以下内容不起作用:
enum UserRole {
USER, ADMIN;
}
class User {
@NotBlank //HV000030: No validator could be found for type: UserRole.
UserRole userRole;
}
我如何使用Hibernate注释来验证枚举成员字段? 以下内容不起作用:
enum UserRole {
USER, ADMIN;
}
class User {
@NotBlank //HV000030: No validator could be found for type: UserRole.
UserRole userRole;
}
请注意,您还可以创建一个验证器来检查字符串是否是枚举的一部分。
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);
}
}
}
这很好,因为您不会丢失“错误值”的信息。 您可以获得像以下消息:
价值“someBadUserType”不是有效的UserType。有效的UserType值为:PERSON,COMPANY
编辑
对于那些想要非Guava版本的人,它应该可以使用类似以下的东西:
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);
}
}
}
如果想要自定义错误消息并展示适当的值,请参考此链接:https://dev59.com/Ueo6XIcBkEYKwwoYLhPO#19833921
enumSelected.getEnumConstants()
)转换为一个枚举名称的集合(AVAILABLE_ENUM_NAMES
),然后你就可以很容易地找到使用Java完成此操作的教程了 :) 可以参考这里:https://dev59.com/kWYr5IYBdhLWcg3wTYgQ - Sebastien Lorber@StringEnumeration(enumClass = UserCivility.class, message="my custom message key")
。 - Sebastien Lorber验证被注释的字符串不为null或空。与NotEmpty的区别在于忽略尾随的空格。
而UserRole
不是String类型,而是一个对象,因此请使用@NotNull
被注释的元素不能为null。接受任何类型。
我认为与Sebastien的答案更相关的是,代码行数更少,并且利用EnumSet.allOf
来代替rawtypes
警告。
public enum FuelTypeEnum {DIESEL, PETROL, ELECTRIC, HYBRID, ...};
public enum BodyTypeEnum {VAN, COUPE, MUV, JEEP, ...};
@Target(ElementType.FIELD) //METHOD, CONSTRUCTOR, etc.
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = EnumValidator.class)
public @interface ValidateEnum {
String message() default "{com.xxx.yyy.ValidateEnum.message}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
Class<? extends Enum<?>> targetClassType();
}
public class EnumValidator implements ConstraintValidator<ValidateEnum, String> {
private Set<String> allowedValues;
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public void initialize(ValidateEnum targetEnum) {
Class<? extends Enum> enumSelected = targetEnum.targetClassType();
allowedValues = (Set<String>) EnumSet.allOf(enumSelected).stream().map(e -> ((Enum<? extends Enum<?>>) e).name())
.collect(Collectors.toSet());
}
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
return value == null || allowedValues.contains(value)? true : false;
}
}
@ValidateEnum(targetClassType = FuelTypeEnum.class, message = "Please select ...."
private String fuelType;
@ValidateEnum(targetClassType = BodyTypeEnum.class, message = "Please select ...."
private String bodyType;
Hibernate Validator
工作。valueOf
方法的默认行为)。例如,如果您有表示DayOfWeek
的枚举,并且您想将整数转换为DayOfWeek
,那么可以创建以下注释:@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER})
@Retention(RUNTIME)
@Constraint(validatedBy = {ValidEnumValueValidator.class})
public @interface ValidEnumValue {
String message() default "invalidParam";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
Class<? extends Enum<?>> value();
String enumMethod() default "name";
String stringMethod() default "toString";
}
public class ValidEnumValueValidator implements ConstraintValidator<ValidEnumValue, String> {
Class<? extends Enum<?>> enumClass;
String enumMethod;
String stringMethod;
@Override
public void initialize(ValidEnumValue annotation) {
this.enumClass = annotation.value();
this.enumMethod = annotation.enumMethod();
this.stringMethod = annotation.stringMethod();
}
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
Enum<?>[] enums = enumClass.getEnumConstants();
Method method = ReflectionUtils.findMethod(enumClass, enumMethod);
return Objects.nonNull(enums) && Arrays.stream(enums)
.map(en -> ReflectionUtils.invokeMethod(method, en))
.anyMatch(en -> {
Method m = ReflectionUtils.findMethod(String.class, stringMethod);
Object o = ReflectionUtils.invokeMethod(m, value);
return Objects.equals(o, en);
});
}
}
public enum TestEnum {
A("test");
TestEnum(String s) {
this.val = s;
}
private String val;
public String getValue() {
return this.val;
}
}
public static class Testee {
@ValidEnumValue(value = TestEnum.class, enumMethod = "getValue", stringMethod = "toLowerCase")
private String testEnum;
}