Mybatis 处理日期格式自动转换

public class User implements Serializable{
    private Integer id;
    private String loginname;
    private String password;
    private Integer status;
    @DateTimeFormat(pattern="yyyy-MM-dd") //页面写入数据库时格式化
    @JSONField(format="yyyy-MM-dd")     //数据库导出页面时json格式化
    private Date createdate;
    private String username;
    //getter And setter.....
}