文章目录

• 一、评论
• 二、分类页面
• 三、标签页面
• 四、运行结果

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