@EnableScheduling
@EnableJpaAuditing //利用jpa可以給MySQL列屬性自動賦值,例如一些創(chuàng)建時間，修改時間
@EnableEurekaClient
@SpringBootApplication
public class CouponTemplateApplication {
    public static void main(String[] args) {
        SpringApplication.run(CouponTemplateApplication.class, args);
    }
 /**
     * 測試中如果無法自動識別,可能是包路徑的問題，采用手動聲明bean的方式
     * @return
     */
    @Bean
    public UserAuditor setUserAuditorAware(){
        return new UserAuditor();
    }
}

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity  //實(shí)體類
@EntityListeners(AuditingEntityListener.class) //監(jiān)聽器，自動賦值創(chuàng)建時間
@Table(name = "coupon_template")
@JsonSerialize(using = CouponTemplateSerialize.class) //綁定自定義的序列化器
public class CouponTemplate implements Serializable {
    /** 自增主鍵 */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id",nullable = false)
    @Basic //指定屬于我們數(shù)據(jù)表的一個列，相反的@Transient，表示該列不屬于數(shù)據(jù)表
    private Integer id;
    /** 是否是可用狀態(tài) */
    @Column(name = "available",nullable = false)
    private Boolean available;
    /** 是否過期 */
    @Column(name = "expired",nullable = false)
    private Boolean expired;
    /** 優(yōu)惠券名稱 */
    @Column(name = "name",nullable = false)
    private String name;
    /** 優(yōu)惠券 logo */
    @Column(name = "logo",nullable = false)
    private String logo;
    /** 優(yōu)惠券描述 */
    @Column(name = "intro",nullable = false)
    private String desc;
    
    /** 優(yōu)惠券模板 創(chuàng)建時間
     *      使用@CreateDate注解在插入的時候，自動生成創(chuàng)建時間，與監(jiān)聽注解有關(guān)
     * */
    @CreatedDate
    @Column(name = "create_time",nullable = false)
    private Date createTime;
}

@Configuration
@Slf4j
public class UserAuditor implements AuditorAware<String> {
    /**
     * 獲取當(dāng)前創(chuàng)建或修改的用戶
     * @return
     */
    @Override
    public Optional<String> getCurrentAuditor() {
        UserDetails user;
        try {
            user = (UserDetails) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
            return Optional.ofNullable(user.getUsername());
        }catch (Exception e){
            return Optional.empty();
        }
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.data.domain.AuditorAware;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import java.util.Optional;
/**
 *  使用@CreatedBy或@LastModifiedBy 則必須實(shí)現(xiàn)AuditorAware接口重寫getCurrentAuditor方法
 * 在定義使用@CreatedBy或@LastModifiedBy時，屬性類型必須與AuditorAware接口的泛型類型相同
 */
@Configuration
public class SpringSecurityAuditorAware  implements AuditorAware<String> {
    @Override
    public Optional<String> getCurrentAuditor() {
        UserDetails userDetails;
        try {
            userDetails =  (UserDetails)SecurityContextHolder.getContext().getAuthentication().getPrincipal();
            return Optional.ofNullable(userDetails.getUsername());
        }catch (Exception e){
            return Optional.empty();
        }
    }