所以我必须比较提到的两个日期,并且我编写了一个验证器,它似乎有一些错误,这有点奇怪: 注释类:此处导入了@Target注释,但无法识别内部的枚举。
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Target({ TYPE, ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = { ValidAfterDateValidator.class })
@Documented
public @interface ValidAfterDate {
String message() default "The End date should be after the starting date." ;
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default { };
}
ValidAfterDateValidator.class:
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import gestionprojet.java.entities.Project;
public class ValidAfterDateValidator implements ConstraintValidator<ValidAfterDate, Project> {
@Override
public void initialize(ValidAfterDate constraintAnnotation) {
}
@Override
public boolean isValid(Project projet, ConstraintValidatorContext context) {
if (projet == null) {
return true;
}
return projet.getDate_Debut().compareTo(projet.getDate_Fin()) > 0;
}
这里不允许使用@ValidAferDate:
Project.class:
@ValidAfterDate
public class Project {
@Future
@DateTimeFormat(pattern="dd/MM/YY")
private Date date_Debut;
@Future
@DateTimeFormat(pattern="dd/MM/YY")
private Date date_Fin;
//Getters & Setters
}
任何帮助都会受到赞赏。感谢
答案 0 :(得分:1)
这:
@Target( { TYPE , ANNOTATION_TYPE })
需要更改为:
@Target( {ElementType.ANNOTATION_TYPE, ElementType.TYPE })
并且印象是:
import java.lang.annotation.ElementType;