英文:
Hibernate Validator - Dynamic Validation-Message
问题
我有一个名为X的类，其中有三个字段：state（一个枚举类型，可以是A或B）、a和b。
当state为A时，a不能为null；当state为B时，b不能为null。
使用 hibernate-validator，我已经构建了以下的验证器：
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = MyValidator.class)
@Documented
public @interface ValidateCondition {
String message() default "ValidateCondition failed";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class MyValidator implements ConstraintValidator<ValidateCondition, X> {
@Override
public boolean isValid(X x, ConstraintValidatorContext context) {
if (x.getState() == State.A) {
return x.getA() != null;
}
if (x.getState() == State.B) {
return x.getB() != null;
}
}
}
所以每当验证失败时，我当前会得到消息 Validation failed，但是我想要的是一条消息，告诉我为什么验证失败，比如 由于 state 为 B，b 不能为空。
我认为我可以以某种方式使用 ConstraintValidatorContext 来实现这一点，但我不知道是否可行，以及如何实现。
英文:
I'm having a class X that has three fields: state (an enum of A and B), a and b.
When state is A, a must not be null, when state is B, b must not be null.
@ValidateCondition(message = "Validation failed")
public class X {
private State state;
private String a;
private String b;
}
Using hibernate-validator, I've build the following Validator:
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = MyValidator.class)
@Documented
public @interface ValidateCondition {
String message() default "ValidateCondition failed";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class MyValidator implements ConstraintValidator<ValidateCondition, X> {
@Override
public boolean isValid(X x, ConstraintValidatorContext context) {
if(x.getState()==State.A){
return x.getA() != null;
}
if(x.getState()==State.B){
return x.getB() != null;
}
}
}
So whenever validation fails, I currently get the message Validation failed, but what I want would be a message, telling me why it failed, like Since state was B, b must not be blank.
I'm assuming I can somehow use the ConstraintValidatorContext for that, but I don't know if or how.
答案1
得分: 2
这很简单：
只需在isValid区域内调用一个上下文：
context.buildConstraintViolationWithTemplate("在此处添加消息");
享受！
英文:
It's quite simple:
Just call a context inside isValid area:
context.buildConstraintViolationWithTemplate("message here");
Enjoy!
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