java - 在 Bean 中验证 Bean

Question

我有以下 bean

public class MyModel {
  @NotNull
  @NotEmpty
  private String name;

  @NotNull
  @NotEmpty
  private int age;

  //how do you validate this?
  private MySubModel subModel;
}

public class MySubModel{

  private String subName;

}

然后我使用@Valid 批注从 Controller 端对此进行验证。

谢谢

Answer 1

您可以使用 Bean Validation (JSR-303) 定义您自己的自定义验证，例如这里是简单的自定义邮政编码验证，通过使用您的自定义注释进行注释，您可以轻松验证:

@Documented
@Constraint(validatedBy = ZipCodeValidator.class)
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ZipCode {
    String message() default "zip code must be five numeric characters";

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

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

自定义验证类，而不是 ，您可以使用自定义 beans，如 <YourAnnotationClassName,TypeWhichIsBeingValidated>

public class ZipCodeValidator implements ConstraintValidator<ZipCode, String> {

    @Override
    public void initialize(ZipCode zipCode) {
    }

    @Override
    public boolean isValid(String string, ConstraintValidatorContext context) {
        if (string.length() != 5)
            return false;
        for (char c : string.toCharArray()) {
            if (!Character.isDigit(c))
                return false;
        }
        return true;
    }

}

下面是它的用法:

public class Address{

  @ZipCode
  private String zip;

}