项目迭代之评论、分类、标签页面实现

• 实体类更新
• 服务层
• 控制层

实体类更新

一、Comment（新增）

package com.whut.news.po;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@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> 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 + '\'' +
", createTime=" + createTime +
", news=" + news +
", replyComments=" + replyComments +
", parentComment=" + parentComment +
", adminComment=" + adminComment +
'}';
}
}

服务层

一、CommentRepository

package com.whut.news.dao;

import com.whut.news.po.Comment;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface CommentRepository extends JpaRepository<Comment,Long> {

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

}

二、CommentService

package com.whut.news.service;

import com.whut.news.po.Comment;

import java.util.List;

public interface CommentService {

List<Comment> listCommentByNewId(Long newId);

Comment saveComment(Comment comment);

}

三、CommentServiceImpl

package com.whut.news.service.impl;

import com.sun.org.apache.regexp.internal.RE;
import com.whut.news.dao.CommentRepository;
import com.whut.news.po.Comment;
import com.whut.news.service.CommentService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@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> 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,存放在临时tempReplys中
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);
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);
}
}

控制层

一、CommentCotroller

package com.whut.news.web;

import com.whut.news.po.Comment;
import com.whut.news.po.User;
import com.whut.news.service.CommentService;
import com.whut.news.service.NewService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import javax.servlet.http.HttpSession;

@Controller
public class CommentController {

@Autowired
private CommentService commentService;

@Autowired
private NewService newService;

private String avatar = "https://tse4-mm.cn.bing.net/th/id/OIP.yweHqHF6IQl7i5yusCTwQQHaHa?pid=Api&rs=1";

@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);
}
commentService.saveComment(comment);
//        System.out.println(commentService.saveComment(comment));
return "redirect:/comments/"+newId;
}

}

二、TypeShowController

package com.whut.news.web;

import com.whut.news.po.Type;
import com.whut.news.service.NewService;
import com.whut.news.service.TypeService;
import com.whut.news.vo.NewQuery;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.web.PageableDefault;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.List;

@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、ShowTagController

package com.whut.news.web;

import com.whut.news.po.Tag;
import com.whut.news.service.NewService;
import com.whut.news.service.TagService;
import com.whut.news.vo.NewQuery;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.web.PageableDefault;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.List;

@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();
}
NewQuery newQuery = new NewQuery();
newQuery.setTypeId(id);
model.addAttribute("tags",tags);
model.addAttribute("page",newService.listNew(id,pageable));
model.addAttribute("activeTagId",id);
return "tags";
}
}