在spring + hibernate中保存creationTimestamp和updatedTime

import javax.persistence.*;
import java.util.Date;

@Entity
@Table(name = "your_table_name")
public class YourEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "creation_timestamp", nullable = false, updatable = false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date creationTimestamp;

    @Column(name = "updated_time", nullable = false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date updatedTime;

    // 其他字段和方法...

    // Getters and Setters...
}

<!-- 数据源配置 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="your_database_driver_class" />
    <property name="url" value="your_database_url" />
    <property name="username" value="your_database_username" />
    <property name="password" value="your_database_password" />
</bean>

<!-- Hibernate SessionFactory 配置 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="your_entity_package" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">your_database_dialect</prop>
            <prop key="hibernate.show_sql">true</prop>
            <!-- 其他Hibernate配置 -->
        </props>
    </property>
</bean>

<!-- Hibernate 事务管理器配置 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- 开启事务注解支持 -->
<tx:annotation-driven transaction-manager="transactionManager" />

@Service
@Transactional
public class YourService {
    @Autowired
    private YourEntityDao yourEntityDao;

    public void saveOrUpdate(YourEntity entity) {
        if (entity.getId() == null) {
            entity.setCreationTimestamp(new Date());
        }
        entity.setUpdatedTime(new Date());
        yourEntityDao.saveOrUpdate(entity);
    }

    // 其他业务方法...
}