SpringBoot中JPA + AuditingEntityListener时区设置方式是什么

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JPA + AuditingEntityListener时区设置

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。

可在应用配置中添加如下配置

将时区设定为指定时区：

spring.jpa.properties.hibernate.jdbc.time_zone = GMT+8

@EntityListeners(AuditingEntityListener.class)介绍

@EntityListeners

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。

AuditingEntityListener.class

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: *  * 
 * <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> * 
 *  * After that it's just a matter of activating auditing in your Spring config: *  * 
 * @Configuration * @EnableJpaAuditing * class ApplicationConfig { *  * } * 
 *  * 
 * <jpa:auditing auditor-aware-ref="yourAuditorAwarebean" /> * 
 *  * @author Oliver Gierke * @author Thomas Darimont */@Configurablepublic class AuditingEntityListener { private ObjectFactory 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) {  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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