Java JSR-303 Bean验证-自定义约束一个验证器的多个注释
编写自定义约束时,一个验证器实现可以验证多个注释。例如,我有几个注释,它们规定了不同的@size注释,但我希望它们都指向同一个验证器类,该类执行一些全局检查,即所有注释都必须与某个正则表达式匹配。就我所见,实现采用了一种注释类型 一个注释Java JSR-303 Bean验证-自定义约束一个验证器的多个注释,java,bean-validation,Java,Bean Validation,编写自定义约束时,一个验证器实现可以验证多个注释。例如,我有几个注释,它们规定了不同的@size注释,但我希望它们都指向同一个验证器类,该类执行一些全局检查,即所有注释都必须与某个正则表达式匹配。就我所见,实现采用了一种注释类型 一个注释 @Target( { METHOD, FIELD, ANNOTATION_TYPE, TYPE}) @Retention(RetentionPolicy.RUNTIME) @Constraint(validatedBy = {UCNValidator.clas
@Target( { METHOD, FIELD, ANNOTATION_TYPE, TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {UCNValidator.class})
@Documented
@Size(min = 9, max = 9, message = "{exactlength}")
public @interface UCN {
String message() default "{invalidFormat}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
String fieldName() default "ucn";
}
@Target({METHOD,FIELD,ANNOTATION\u TYPE,TYPE})
@保留(RetentionPolicy.RUNTIME)
@约束(validatedBy={UCNValidator.class})
@记录
@大小(最小值=9,最大值=9,消息=“{exactlength}”)
公共@接口UCN{
字符串消息()默认值“{invalidFormat}”;
类[]组()默认值{};
类在验证某个对象的属性时,似乎没有办法从该对象访问其他值。我使用的解决方案是将注释放在该类上,然后验证器将获取整个对象进行验证,您可以访问执行验证所需的信息
我写了一篇文章来比较一个对象的两个不同属性:
@Target(TYPE)
@Retention(RUNTIME)
@Constraint(validatedBy = LessThanValidator.class)
@Documented
public @interface LessThan {
String message() default "{com.bullethq.constraints.LessThan}";
String bigValueProperty();
String littleValueProperty();
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
@Target(类型)
@保留(运行时)
@约束(validatedBy=LessThanValidator.class)
@记录
公共@interface LessThan{
字符串消息()默认值为“{com.bullethq.constraints.LessThan}”;
字符串bigValueProperty();
字符串littleValueProperty();
类[]组()默认值{};
ClassDecision无论如何这不是最好的方法。对于常见的验证功能,我可以编写一个供所有验证程序使用的通用方法。如果您可以发布getValue
@Target(TYPE)
@Retention(RUNTIME)
@Constraint(validatedBy = LessThanValidator.class)
@Documented
public @interface LessThan {
String message() default "{com.bullethq.constraints.LessThan}";
String bigValueProperty();
String littleValueProperty();
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class LessThanValidator implements ConstraintValidator<LessThan, Object> {
private LessThan constraint;
public void initialize(LessThan constraintAnnotation) {
constraint = constraintAnnotation;
}
public boolean isValid(Object object, ConstraintValidatorContext cvc) {
Object bigValue = getValue(object, constraint.bigValueProperty());
Object littleValue = getValue(object, constraint.littleValueProperty());
// If one of the values is null, then we do not perform validation.
if (bigValue == null || littleValue == null) {
return true;
}
if (bigValue instanceof Comparable && littleValue instanceof Comparable) {
boolean valid = ((Comparable<Object>) bigValue).compareTo(littleValue) > 0;
if (!valid) {
// If the values are not valid, then build a custom violations which has the correct path in it.
cvc.buildConstraintViolationWithTemplate(cvc.getDefaultConstraintMessageTemplate())
.addNode(constraint.littleValueProperty())
.addConstraintViolation().disableDefaultConstraintViolation();
}
return valid;
}
throw new IllegalArgumentException("Properties " + constraint.bigValueProperty() + " and " + constraint.littleValueProperty() + " both need to be comparable in " + object.getClass());
}
}