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在SpringBoot项目中,如果应用启用了EnableJpaAuditing并且使用AuditingEntityListener对实体的创建时间、更新时间进行自动审计,可能存在生成时间的时区和系统时区不一致的问题。
将时区设定为指定时区:
spring.jpa.properties.hibernate.jdbc.time_zone = GMT+8
源码
/** * Specifies the callback listener classes to be used for an * entity or mapped superclass. This annotation may be applied * to an entity class or mapped superclass. * * @since Java Persistence 1.0 */ @Target({TYPE}) @Retention(RUNTIME) public @interface EntityListeners { /** The callback listener classes */ Class[] value(); }
分析
从源码的注释中可以很清楚的了解到该注解的作用,简单翻译如下:该注解用于指定Entity或者superclass上的回调监听类。该注解可以用于Entity或者superclass上。
源码
/** * JPA entity listener to capture auditing information on persiting and updating entities. To get this one flying be * sure you configure it as entity listener in your {@code orm.xml} as follows: * * <pre> * <persistence-unit-metadata> * <persistence-unit-defaults> * <entity-listeners> * <entity-listener class="org.springframework.data.jpa.domain.support.AuditingEntityListener" /> * </entity-listeners> * </persistence-unit-defaults> * </persistence-unit-metadata> * </pre> * * After that it's just a matter of activating auditing in your Spring config: * * <pre> * @Configuration * @EnableJpaAuditing * class ApplicationConfig { * * } * </pre> * * <pre> * <jpa:auditing auditor-aware-ref="yourAuditorAwarebean" /> * </pre> * * @author Oliver Gierke * @author Thomas Darimont */ @Configurable public class AuditingEntityListener { private ObjectFactory<AuditingHandler> handler; /** * Configures the {@link AuditingHandler} to be used to set the current auditor on the domain types touched. * * @param auditingHandler must not be {@literal null}. */ public void setAuditingHandler(ObjectFactory<AuditingHandler> auditingHandler) { Assert.notNull(auditingHandler, "AuditingHandler must not be null!"); this.handler = auditingHandler; } /** * Sets modification and creation date and auditor on the target object in case it implements {@link Auditable} on * persist events. * * @param target */ @PrePersist public void touchForCreate(Object target) { if (handler != null) { handler.getObject().markCreated(target); } } /** * Sets modification and creation date and auditor on the target object in case it implements {@link Auditable} on * update events. * * @param target */ @PreUpdate public void touchForUpdate(Object target) { if (handler != null) { handler.getObject().markModified(target); } } }
分析
同样的从该类的注释也可以了解到该类的作用:这是一个JPA Entity Listener,用于捕获监听信息,当Entity发生持久化和更新操作时。
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