Spring数据mongoDb不是像Spring数据Jpa那样的空注释

Question

像spring-data-jpa有@NotNull注释可以在spring-data-mongodb中使用它.

Answer 1

javax.validation.constraints.NotNull本身可以与spring-data-mongodb一起使用.为此,您需要具备以下条件.

在您的pom.xml中添加了JSR-303依赖项

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.3.4.Final</version>
</dependency>

声明适当的验证器和验证器事件侦听器

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.mapping.event.ValidatingMongoEventListener;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;

@Configuration
public class Configuration {
    @Bean
    public ValidatingMongoEventListener validatingMongoEventListener() {
        return new ValidatingMongoEventListener(validator());
    }

    @Bean
    public LocalValidatorFactoryBean validator() {
        return new LocalValidatorFactoryBean();
    }
}

在MongoDB POJO中添加@NotNull注释

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import javax.validation.constraints.NotNull;

@Document(collection = "user_account")
public class User {
    @Id
    private String userId;

    @NotNull(message = "User's first name must not be null")
    private String firstName;

    @NotNull(message = "User's last name must not be null")
    private String lastName;
}

通过此配置和实现,如果您使用null值保留User对象,那么您将看到失败 javax.validation.ConstraintViolationException