import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;import java.util.Date;/*** 拦截处理公共字段*/
@Primary
@Component
public class CommonColumnHandler implements MetaObjectHandler {@Overridepublic void insertFill(MetaObject metaObject) {if(metaObject.getOriginalObject() instanceof CommonBean){String userId = SessionUtil.currentUserId();CommonBean bean = (CommonBean) metaObject.getOriginalObject();bean.setCreateTime(new Date());bean.setUpdateTime(bean.getCreateTime());if(StringUtils.isNotBlank(userId)){bean.setCreateUser(userId);bean.setUpdateUser(userId);}if(StringUtils.isBlank(bean.getId())){bean.setId(StringTool.uuid());}}}@Overridepublic void updateFill(MetaObject metaObject) {if(metaObject.getOriginalObject() instanceof CommonBean){CommonBean bean = (CommonBean) metaObject.getOriginalObject();bean.setUpdateTime(new Date());String userId = SessionUtil.currentUserId();if(StringUtils.isNotBlank(userId)){bean.setUpdateUser(userId);}}}
}

 上述实现类，程序根本就没有进去，保存方法如下

整个上面的写法只更新了实体的两个属性，所以没有触发实现类的填充代码，下面是整个实体的更新，就能够进入实现类。

因此只有整个实体更新或保存才能触发填充代码