实体类加注解

    /**
     * 创建者
     */
    @TableField(value = "create_user", fill = FieldFill.INSERT)
    private String createUser;

    /**
     * 更新者
     */
    @TableField(value = "update_user", fill = FieldFill.UPDATE)
    private String updateUser;

    /**
     * 创建时间
     */
    @TableField(value = "create_time", fill = FieldFill.INSERT)
    private LocalDate createTime;

    /**
     * 更新时间
     */
    @TableField(value = "update_time", fill = FieldFill.UPDATE)
    private LocalDate updateTime;

mybatis 配置

  globalConfig: #全局配置
      banner: false
      metaObjectHandler: "xx.xx.config.MyMetaObjectHandler" # mybatisPlus之自动填充工具

MetaObjectHandler 实现类(正确的写法)

@Configuration
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createUser", "11", metaObject);
        this.setFieldValByName("createTime", LocalDate.now(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateUser", "22", metaObject);
        this.setFieldValByName("updateTime", LocalDate.now(), metaObject);
    }
}

MetaObjectHandler 实现类(错误的写法)

@Configuration
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("create_user", "11", metaObject);
        this.setFieldValByName("create_time", LocalDate.now(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("update_user", "22", metaObject);
        this.setFieldValByName("update_time", LocalDate.now(), metaObject);
    }
}