實訓小結十一

package com.zr0726.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 +
            '}';
}

}

package com.zr0726.news.service.impl;

import com.sun.org.apache.regexp.internal.RE;
import com.zr0726.news.dao.CommentRepository;
import com.zr0726.news.po.Comment;
import com.zr0726.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);
   }
   //合併評論的各層子代到第一級子代集閤中
    combineChildren(commentsView);
   return commentsView;
}

private void combineChildren(List<Comment> comments){
    for (Comment comment:comments){
        List<Comment> replys1 = comment.getReplyComments();
        for (Comment reply1 : replys1){
            //回圈迭代，找出子代,存放在臨時tempReplys中
            recursively(reply1);
        }
        comment.setReplyComments(tempReplys);
        //清除臨時存放區
        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);
}

}

package com.zr0726.news.web;

import com.zr0726.news.po.Comment;
import com.zr0726.news.po.User;
import com.zr0726.news.service.CommentService;
import com.zr0726.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;
}

}