Java方向（SSM+SpringBoot）项目实训Day11-SpringBoot（新闻管理系统）评论+分类页面+标签页面
Day11-SpringBoot（新闻管理系统）评论+分类页面+标签页面
- 评论
-
- 添加评论
- 回复评论
- 分类页面
- 标签页面
Java方向（SSM+SpringBoot）项目实训
Day11（2020.7.31）
评论
添加评论
1.po下创建Comment实体类；
Comment：中添加
@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 createTime) {
this.createTime = createTime;
}
public News getNews() {
return news;
}
public void setNews(News news) {
this.news = news;
}
public List<Comment> getReplyComments() {
return replyComments;
}
public void setReplyComments(List<Comment> replyComment) {
this.replyComments = replyComment;
}
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 + '\'' +
", createTime=" + createTime +
", news=" + news +
", replyComment=" + replyComments +
", parentComment=" + parentComment +
", adminComment=" + adminComment +
'}';
}
}
2.修改News实体类；
News：中添加
@OneToMany(mappedBy = "news")
private List<Comment> comments = new ArrayList<>();
//添加Getter and Setter方法
public List<Comment> getComments() {
return comments;
}
public void setComments(List<Comment> comments) {
this.comments = comments;
}
//修改toString（）方法，toString中添加
", comments=" + comments +
3.dao下创建一个CommentRepository接口；
CommentRepository：中添加
public interface CommentRepository extends JpaRepository<Comment,Long> {
}
4.service下创建CommentService接口；
CommentService：中添加
public interface CommentService {
Comment saveComment(Comment comment);
}
5.service.impl下创建CommentServiceImpl类；
CommentServiceImpl：中添加
@Service
public class CommentServiceImpl implements CommentService {
@Autowired
private CommentRepository commentRepository;
@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);
}
}
6.web下创建CommentController类；
CommentController：中添加
@Controller
public class CommentController {
@Autowired
private CommentService commentService;
@Autowired
private NewService newService;
private String avatar = "http://static.jwcyber.com/wp-content/uploads/2017/10/1459086602935351.jpg";
@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(commentService.saveComment(comment));
return "redirect:/comments/"+newId;
}
}
回复评论
1.修改CommentRepository接口；
CommentRepository：中添加
List<Comment> findByNewsIdAndParentCommentNull(Long newId, Sort sort);
2.修改CommentService接口；
CommentService：中添加
List<Comment> listCommentByNewId(Long newId);
3.修改CommentServiceImpl类；
CommentServiceImpl：中添加
@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> commentsView = new ArrayList<>();
for (Comment comment:comments){
Comment c = new Comment();
BeanUtils.copyProperties(comment,c);
commentsView.add(c);
}
//合并评论的各层子代到第一级子代集合中
combineChildren(commentsView);
return commentsView;
}
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);
//清楚临时缓存区
tempReplys = new ArrayList<>();
}
}
private List<Comment> tempReplys = new ArrayList<>();
private void recursively(Comment comment){
tempReplys.add(comment); //顶节点添加到临时存放区
if (comment.getReplyComments().size()>0){
List<Comment> replys = comment.getReplyComments();
for (Comment reply:replys){
tempReplys.add(reply);
if(reply.getReplyComments().size()>0){
recursively(reply);
}
}
}
}
4.修改CommentController类；
CommentController：中添加
@GetMapping("/comments/{newId}")
public String comments(@PathVariable Long newId, Model model){
model.addAttribute("comments",commentService.listCommentByNewId(newId));
return "new::commentList";
}
分类页面
web下创建TypeShowController类；
TypeShowController：中添加
@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";
}
}
标签页面
1.修改NewService接口；
NewService：中添加
//标签页面查看新闻
Page<News> listNew(Long tagId,Pageable pageable);
2.修改NewServiceImpl类；
NewServiceImpl：中添加
@Override
public Page<News> listNew(Long tagId, Pageable pageable) {
return newRepository.findAll(new Specification<News>() {
@Override
public Predicate toPredicate(Root<News> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
Join join = root.join("tags");
return cb.equal(join.get("id"),tagId);
}
},pageable);
}
3.web下创建TagShowController类；
TagShowControlle：中添加
@Controller
public class TagShowController {
@Autowired
private NewService newService;
@Autowired
private TagService tagService;
@GetMapping("/tags/{id}")
public String types(@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";
}
}
Test
1.登录成功后，进入新闻管理界面，编辑某一条新闻，勾选评论，然后点击发布，使新闻变为可评论状态；
添加评论，昵称、邮箱均可编辑；
评论添加成功；
回复评论则点击，已有评论下方的回复，再次编辑评论内容即可；
评论回复成功；
2.进入新闻管理界面，编辑某一条新闻，取消勾选评论，然后点击发布，使新闻变为不可评论状态；
再次点开该新闻时，已有评论不可见，并且不可添加评论；
3.分类页面展示新闻；
点击上方导航栏中的分类，即可展示所有新闻分类，并按分类中新闻数量由多到少排序展示；
4.标签页面展示新闻；
点击上方导航栏中的标签，即可展示所有新闻标签，并按标签中新闻数量由多到少排序展示；
