mybatisplus自动填充属性值的实现步骤

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "cc_user")
public class User {

    private Integer id;
    private String username;
    @TableField(fill = FieldFill.INSERT)
    private String createBy;
    private String updateBy;
    private Date createTime;
    private Date updateTime;
}

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        System.out.println("插入填充方法被调用");
        this.setFieldValByName("createBy","waterkid",metaObject);
        this.setFieldValByName("updateBy","cc",metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        System.out.println("插入填充方法被调用");
        this.setFieldValByName("createBy","waterkid",metaObject);
        this.setFieldValByName("updateBy","cc",metaObject);
    }
}

    @Test
    void contextLoads() {
   
        int hehe = userMapper.insert(User.builder().username("hehe").build());
    }