评论+分类页面+标签页面

一、评论

1.建立评论实体类，注意评论包含新闻评论以及评论的评论，会不端嵌套，直到直接在新闻下的评论

@Entity
@Table(name="t_comment")
public class Comment {
     
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String nickname;
    private String email;
    private String content;
    private String avatar;
    @Temporal(TemporalType.TIMESTAMP)
    private Date createTime;

    @ManyToOne
    private News news;

    @OneToMany(mappedBy = "parentComment")
    private List<Comment> replyComments = new ArrayList<>();

    @ManyToOne
    private Comment parentComment;

    private boolean adminComment;

    public Comment() {
     
    }

    public Long getId() {
     
        return id;
    }

    public void setId(Long id) {
     
        this.id = id;
    }

    public String getNickname() {
     
        return nickname;
    }

    public void setNickname(String nickname) {
     
        this.nickname = nickname;
    }

    public String getEmail() {
     
        return email;
    }

    public void setEmail(String email) {
     
        this.email = email;
    }

    public String getContent() {
     
        return content;
    }

    public void setContent(String content) {
     
        this.content = content;
    }

    public String getAvatar() {
     
        return avatar;
    }

    public void setAvatar(String avatar) {
     
        this.avatar = avatar;
    }

    public Date getCreateTime() {
     
        return createTime;
    }

    public void setCreateTime(Date creatTime) {
     
        this.createTime = creatTime;
    }

    public News getNews() {
     
        return news;
    }

    public void setNews(News news) {
     
        this.news = news;
    }

    public List<Comment> getReplyComments() {
     
        return replyComments;
    }

    public void setReplyComments(List<Comment> replyComments) {
     
        this.replyComments = replyComments;
    }

    public Comment getParentComment() {
     
        return parentComment;
    }

    public void setParentComment(Comment parentComment) {
     
        this.parentComment = parentComment;
    }

    public boolean isAdminComment() {
     
        return adminComment;
    }

    public void setAdminComment(boolean adminComment) {
     
        this.adminComment = adminComment;
    }

    @Override
    public String toString() {
     
        return "Comment{" +
                "id=" + id +
                ", nickname='" + nickname + '\'' +
                ", email='" + email + '\'' +
                ", content='" + content + '\'' +
                ", avatar='" + avatar + '\'' +
                ", creatTime=" + createTime +
                ", news=" + news +
                ", replyComment=" + replyComments +
                ", parentComment=" + parentComment +
                ", adminComment=" + adminComment +
                '}';
    }
}

2.建立CommentRepository接口

import java.util.List;

public interface CommentRepository extends JpaRepository<Comment,Long> {
     

    List<Comment> findByNewsIdAndParentCommentNull(Long newId, Sort sort);
}

3.建立service接口及Impl实现接口
接口：

public interface CommentService {
     
    List<Comment> listCommentByNewId(Long newId);
    Comment saveComment(Comment comment);
}

实现：

@Service
public class CommentServiceImpl implements CommentService {
     

    @Autowired
    private CommentRepository commentRepository;

    @Override
    public List<Comment> listCommentByNewId(Long newId) {
     
        Sort sort = Sort.by("createTime");
        List<Comment> comments = commentRepository.findByNewsIdAndParentCommentNull(newId,sort);
        return eachComment(comments);

    }

    private List<Comment> eachComment(List<Comment> comments){
     
        List<Comment> commentView = new ArrayList<>();
        for(Comment comment:comments){
     
            Comment c = new Comment();
            BeanUtils.copyProperties(comment,c);
            commentView.add(c);
        }
        //合并评论的各层子代到第一级子代集合中
        combineChildren(commentView);
        return commentView;
    }

    private void combineChildren(List<Comment> comments){
     
        for(Comment comment:comments){
     
            List<Comment> replys1 = comment.getReplyComments();
            for(Comment reply1:replys1){
     
                //循环迭代，找出子代
                recursively(reply1);
            }
            comment.setReplyComments(tempReplys);
            //清除临时存放区
            tempReplys = new ArrayList<>();
        }
    }

    private List<Comment> tempReplys = new ArrayList<>();

    private void recursively(Comment comment){
     
        tempReplys.add(comment);  //顶节点
        if(comment.getReplyComments().size()>0){
     
            List<Comment> replys = comment.getReplyComments();
            for(Comment reply :replys){
     
                tempReplys.add(reply);
                if(reply.getReplyComments().size()>0){
     
                    recursively(reply);
                }
            }
        }
    }


    @Override
    public Comment saveComment(Comment comment) {
     
        Long parentCommentId = comment.getParentComment().getId();
        if(parentCommentId!=-1){
     
            comment.setParentComment(commentRepository.findById(parentCommentId).orElse(null));
        }else {
     
            comment.setParentComment(null);
        }
        comment.setCreateTime(new Date());
        return commentRepository.save(comment);
    }


}

4.建立controller类

@Controller
public class CommentController {
     

    @Autowired
    private CommentService commentService;

    @Autowired
    private NewService newService;

    private String avatar = "http://www.sastind.gov.cn/n112/n117/c6809892/part/6784526.jpg";

    @GetMapping("/comments/{newId}")
    public String comments(@PathVariable Long newId, Model model){
     
        model.addAttribute("comments",commentService.listCommentByNewId(newId));
        return "new::commentList";
    }

    @PostMapping("/comments")
    public String post(Comment comment, HttpSession session){
     
        Long newId = comment.getNews().getId();
        comment.setNews(newService.getNew(newId));
        User user = (User) session.getAttribute("user");
        if(user!=null){
     
            comment.setAdminComment(true);
            comment.setAvatar(avatar);
        }else {
     
            comment.setAvatar(avatar);
        }
        commentService.saveComment(comment);
        System.out.println("555555");
       // System.out.println(commentService.saveComment(comment));
        return "redirect:/comments/"+newId;
    }
}

二、分类页面

1.建立TypeShowController类

@Controller
public class TypeShowController {
     

    @Autowired
    private TypeService typeService;

    @Autowired
    private NewService newService;

    @GetMapping("/types/{id}")
    public String types(@PageableDefault(size = 8,sort = {
     "updateTime"},direction = Sort.Direction.DESC)
                        Pageable pageable,@PathVariable Long id, Model model){
     
        List<Type> types = typeService.listTypeTop(20);
        if(id==-1){
     
            id = types.get(0).getId();
        }
        NewQuery newQuery = new NewQuery();
        newQuery.setTypeId(id);
        model.addAttribute("types",types);
        model.addAttribute("page",newService.listNew(pageable,newQuery));
        model.addAttribute("activeTypeId",id);
        return "types";
    }
}

三、标签页面

1.建立TagShowController类

@Controller
public class TagShowController {
     

    @Autowired
    private NewService newService;

    @Autowired
    private TagService tagService;

    @GetMapping("/tags/{id}")
    public String tags(@PageableDefault(size = 8,sort = {
     "updateTime"},direction = Sort.Direction.DESC)
                                Pageable pageable, @PathVariable Long id, Model model){
     
        List<Tag> tags = tagService.listTagTop(20);
        if(id==-1){
     
            id = tags.get(0).getId();
        }
        model.addAttribute("tags",tags);
        model.addAttribute("page",newService.listNew(id,pageable));
        model.addAttribute("activeTagId",id);
        return "tags";
    }
}

四、运行结果

1.评论

2.分类

3.标签