如何自定义JSR-303标准的validator

时间:2023-03-09 19:40:10
如何自定义JSR-303标准的validator

在web应用中为了保证数据的有效性而对用户提交的表单数据是必需的,而前台客户端的验证例如javascript并不总是那么安全和可靠,这样我们就需要一个健壮的后台验证框架来处理这个问题。好在java发布了JSR-303接口标准,而实现这一标准的有很多供应商,Hibernate Validator验证框架是使用得比较多的。

今天在处理用户提交的身份证号码这个表单域遇到了一个问题,大家知道我们的身份证号码早期版本只有15位,而二代身份证号码都是18位,Hibernate Validator的@Size注解只能处理最少多少位至最多多少位,却不能处理15位或18位这种情况,于是乎,我就想到了需要使用自定义注解validator来解决这个问题。

首先我们需要定义一个Annotation:

@Documented
@Constraint(validatedBy = { IDConstraintValidator.class })
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface IDValidator { String message() default "{id}"; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; }

然后定义一个类用来处理具体的验证逻辑:

 public class IDConstraintValidator implements ConstraintValidator<IDValidator, String> {

     @Override
public void initialize(IDValidator idValidator) { } @Override
public boolean isValid(String id, ConstraintValidatorContext ctx) {
int length = id.length();
if (isNumeric(id) && (length == 15 || length == 18)) {
return true;
}
return false;
}
}

最后在pojo类上面应用我的注解:

 public abstract class Person implements Serializable {

     private static final long serialVersionUID = 1L;

     @IDValidator(message="{person.id.invalid}")
private String id; private String firstName; private String lastName; private String gender; private int age; public String getId() {
return id;
}

我把错误信息放在资源文件里面,省去页面测试描述,但是我把Controller里面打印的错误信息展示出来了:

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