一、对json里面内容建立实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class RouteMetaEntity {
    private String title;
    private Boolean affix;
    private Boolean isAlwaysShow;
}

二、主类做映射

@TableField(typeHandler = JacksonTypeHandler.class)
  private RouteMetaEntity meta;

三、如果在mybatis的xml文件中

<resultMap id="xxxx" type="com.example.system_manage.entity.主实体类">
        <result column="meta" typeHandler="com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler" property="meta" />
    </resultMap>