1、引入依赖

        <!--        mybatis-plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.1</version></dependency>

2、编写entity

 @Data
@AllArgsConstructor
@TableName("user")
@NoArgsConstructor
public class User  {
/*** 创建人名称*/@TableField(fill = FieldFill.INSERT)private String createUserName;/*** 创建时间*/@TableField(fill = FieldFill.INSERT)private Date createTime;/*** 修改人名称*/@TableField(fill = FieldFill.INSERT_UPDATE)private String updateUserName;/*** 修改时间*/@TableField(fill = FieldFill.INSERT_UPDATE)private Date updateTime;
}

3、编写处理器

@Component
@Slf4j
public class AutoInsertMetaObjectHandler  implements MetaObjectHandler {@Overridepublic void insertFill(MetaObject metaObject) {log.info("start insert fill ....");//setFieldValByName(String fieldName, Object fieldVal, MetaObject metaObject)this.setFieldValByName("createTime",new Date(),metaObject);this.setFieldValByName("createUserName","测试1",metaObject);this.setFieldValByName("updateTime",new Date(),metaObject);this.setFieldValByName("updateUserName","测试1",metaObject);}@Overridepublic void updateFill(MetaObject metaObject) {log.info("start insert update ....");this.setFieldValByName("updateTime",new Date(),metaObject);this.setFieldValByName("updateUserName", "测试2",metaObject);}}

4、测试

官网：自动填充功能 | MyBatis-Plus (baomidou.com)