在Bean中验证Bean

Question

我有以下豆子

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注释从控制器端验证这一点。

谢谢

Answer 1

您可以使用Bean验证(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，您可以轻松地验证:

@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 {};
}

和自定义验证类，而不是，您可以使用自定义bean，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;
}

Answer 2

你可以试试:

public class MyModel {
    @NotNull
    @NotEmpty
    private String name;
    @NotNull
    @NotEmpty
    private int age;
    // how do you validate this?
    private MySubModel subModel;
    @NotNull
    @Size(min=5, max=10)
    public String getSubModelSubName() {
        return subModel == null ? null : subModel.getSubName();
    }
}

另一种可能性是对内部bean使用@Valid注释。例如:

public class MySubModel{
  @NotNull
  @Size(min=5, max=10)
  private String subName;
}

然后，你必须像这样编写你的主类:

public class MyModel {
    @NotNull
    @NotEmpty
    private String name;
    @NotNull
    @NotEmpty
    private int age;
    // how do you validate this?
    @Valid
    private MySubModel subModel;
}

我使用的是Spring Boot 1.2.5