Is there a uuid validator annotation?

问题

I can't find a @UUID (or similar) annotation for validating input parameters in a java web app.

I've looked so far in

1. javax.validation.constraints
2. org.hibernate.validator.constraints

回答1:

yes, build it by yourself

@Target(ElementType.FIELD)
@Constraint(validatedBy={})
@Retention(RUNTIME)
@Pattern(regexp="^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$")
public @interface UUID {
    String message() default "{invalid.uuid}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

回答2:

The solution from Jaiwo99 works, but I was unable to set a custom message from the outside (it is overriden by the message from @Pattern). If you need that, I propose that you simply use something like this:

@Pattern(regexp = SomeUtilClass.UUID_PATTERN, message = "TokenFormatError")
private String token;

You can put the pattern in some static final field to avoid duplication:

public static SomeUtilClass {
    public static final String UUID_PATTERN = "^[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}$";
}

来源：https://stackoverflow.com/questions/37320870/is-there-a-uuid-validator-annotation