MybatisPlus公共字段自动注入方法实现

            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.5.1</version>
            </dependency>

// MybatisPlus 公共字段自动填充
@Component
@Slf4j
public class MybatisPlusHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", LocalDateTime.now(), metaObject);
        this.setFieldValByName("createUser", BaseContext.getCurrentId(), metaObject);
    }

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

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@TableName("employee")
public class Employee implements Serializable {

    private static final long serialVersionUID = 1L;


    @TableId(type = IdType.AUTO)
    private Long id;

    private String username;

    private String name;

    private String password;

    private String phone;

    private String sex;

    private String idNumber;

    private Integer status;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @TableField(fill = FieldFill.UPDATE)
    private LocalDateTime updateTime;

    @TableField(fill = FieldFill.INSERT)
    private Long createUser;

    @TableField(fill = FieldFill.UPDATE)
    private Long updateUser;

}