springboot实现新闻管理功能

接着昨天的项目继续开发：
新闻实体类：

@Entity
@Table(name = "t_news")
public class News {
   
   

    @Id     //主键标识
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String title;
    @Basic(fetch = FetchType.LAZY)  //懒加载
    @Lob
    private String content;
    private String firstPicture;
    private String flag;
    private String views;
    private boolean appreciation;
    private boolean shareStatement;
    private boolean commentabled;
    private boolean published;
    private boolean recommend;
    @Temporal(TemporalType.TIMESTAMP)   //年月日-时分秒
    private Date createTime;
    @Temporal(TemporalType.TIMESTAMP)
    private Date updateTime;

    @ManyToOne
    private Type type;

    @ManyToOne
    private User user;

    @ManyToMany(cascade = CascadeType.PERSIST) //级联
    private List<Tag> tags=new ArrayList<>();

    @Transient  //该注解表示不会被映射到数据库中
    private String tagIds;//接收前端页面传过来的标签Id

    private String description;
}

创建vo包，VO是指value object值对象，通常用于业务层之间的数据传递，和PO一样也是仅仅包含数据而已。一般来说，PO只能用在数据层，VO用在商业逻辑层和表示层。在vo包下创建NewsQuery类，我们利用NewsQuery类专门处理新闻管理界面的条件查询。因为我们需要通过新闻的标题、类型以及是否被推荐作为条件来查询数据库里的新闻，所以我们就利用这三个属性来组成一个查询类。

public class NewQuery {
   
   
    private String title;
    private Long typeId;
    private boolean recommend;

    public String getTitle() {
   
   
        return title;
    }

    public void setTitle(String title) {
   
   
        this.title = title;
    }

    public Long getTypeId() {
   
   
        return typeId;
    }

    public void setTypeId(Long typeId) {
   
   
        this.typeId = typeId;
    }

    public boolean isRecommend() {
   
   
        return recommend;
    }

    public void