Question

我已经为我的bean字段验证做了自定义注释。我使用@Age(value = 10)注释来验证年龄。我编写了如下代码。

import java.lang.annotation.Documented;  
import java.lang.annotation.ElementType;  
import java.lang.annotation.Retention;  
import java.lang.annotation.RetentionPolicy;  
import java.lang.annotation.Target;  
import javax.validation.Constraint;  
import javax.validation.Payload;  



@Documented
@Constraint(validatedBy = AgeConstraintValidator.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface Age {

    String message() default "{Age is not valid }";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};

    int value();
}

这是年龄限制验证器的代码

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class AgeConstraintValidator   implements ConstraintValidator< Age, Long> {

    private Age age;

    @Override
    public void initialize(Age age) {
        this.age = age;
    }

    @Override
    public boolean isValid(Long dob, ConstraintValidatorContext context) {
        System.out.print(" age in annotion");
              if(dob != age.value()){
                     return true;
                 }
        return false;
    }

}

现在当我在我的bean中使用@Age（value = 10）时，它不会被称为Age annotation。任何人都可以告诉我我的代码有任何错误。当我创建我的bean对象并为测试指定年龄不同但我无法在bean的字段上获得任何验证。

Answer 1

Spring不会自动获取此自定义注释。你必须通过定义BeanPostProcessor让Spring知道。创建一个实现它的类对于e-g

import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.BeansException;

public class InitHelloWorld implements BeanPostProcessor {

   public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
      System.out.println("BeforeInitialization : " + beanName);
      return bean;  // you can return any other object as well
   }

   public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
      System.out.println("AfterInitialization : " + beanName);
      return bean;  // you can return any other object as well
   }

}

并在spring config xml中提及此bean，如下所示

 <bean class="<your pack>.InitHelloWorld" />

自定义注释不称为

1 个答案: