評論回覆加載渲染

評論回覆實體：
public class Comment {

private static final long serialVersionUID = 1L;
 private String id;
private Answers ansid;		// 說說id
private String context;		// 評價內容
private User conmmenter;		// 評論
private String callid;		// 被評論id
private List<Comment> callList; //回覆列表
private User respondent;		//被評論人
}

//鏈表結構類
public class NodeComment {

public NodeComment(){

}

/**
 * 構造函數
 * @param comment
 */
public NodeComment(Comment comment){
    this.id = comment.getId();
    this.ansid = comment.getAnsid();
    this.callid = comment.getCallid();
    this.context = comment.getContext();
    this.conmmenter = comment.getConmmenter();
    this.respondent = comment.getRespondent();
}

private String id;
private Answers ansid;		// 說說id
private String context;		// 評價內容
private User conmmenter;		// 評論
private String callid;		// 被評論id
private List<Comment> callList; //回覆列表
private User respondent;		//被評論人
//下一條回覆
private List<NodeComment> nextNodes = new ArrayList<NodeComment>();

public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public Answers getAnsid() {
    return ansid;
}
public void setAnsid(Answers ansid) {
    this.ansid = ansid;
}
public String getContext() {
    return context;
}
public void setContext(String context) {
    this.context = context;
}
public User getConmmenter() {
    return conmmenter;
}

public void setConmmenter(User conmmenter) {
    this.conmmenter = conmmenter;
}

public String getCallid() {
    return callid;
}

public void setCallid(String callid) {
    this.callid = callid;
}
public float getGrade() {
    return grade;
}

public void setGrade(float grade) {
    this.grade = grade;
}
public User getRespondent(){
    return respondent;
}
public void setRespondent(User respondent){
    this.respondent =respondent;
}

public List<NodeComment> getNextNodes() {
    return nextNodes;
}
public void setNextNodes(List<NodeComment> nextNodes) {
    this.nextNodes = nextNodes;
}

/**
 * 將單個node添加到鏈表中
 * @param list
 * @param node
 * @return
 */
public static boolean addNode(List<NodeComment> list,NodeComment node){
    for (NodeComment node1 : list) {   //循環添加
        if (node1.getId().equals(node.getCallid())){   //判斷留言的上一段是都是這條留言
            node1.getNextNodes().add(node);   //返回true;
            return true;
        }else{     //否則遞歸繼續判斷
            if (node1.getNextNodes().size()!=0)
                if (NodeComment.addNode(node1.getNextNodes(),node)){
                    return true;
                }
        }
    }
    return false;
}


/**
 * 將查出來的lastId不爲null的回覆都添加到第一層Node集合中
 * @param firstList
 * @param thenList
 * @return
 */
public static List addAllNode(List<NodeComment> firstList,List<Comment> thenList){
    if (thenList.size()!=0){
        int size = thenList.size();
        for (int i = 0;i<size;i++){
            if (NodeComment.addNode(firstList,new NodeComment(thenList.get(i)))){
                thenList.remove(i);
                i--;
                size--;
            }
        }
        return firstList;
    }
    return firstList;
}

//打印
public static void show(List<NodeComment> list){
    for (NodeComment node : list) {
        System.out.println(node.getConmmenter().getName()+" 用戶回覆了ni"+node.getContext());
        System.out.println(node.getNextNodes().size());
        if (node.getNextNodes().size()!=0){
            NodeComment.show(node.getNextNodes());
        }

    }
}

}

調用的部分代碼：

//查詢id爲ansid.getId()且callid爲null的評論
List firstList =commentMapper.findAllByDiaryIdAndLastIdNull(answers.getId());
//查詢id爲ansid.getId()且callid不爲null的評論
List thenList = commentMapper.findAllByDiaryIdAndLastIdNotNull(answers.getId());
//新建一個Node集合。
ArrayList nodes = new ArrayList<>();
//將第一層評論都添加都Node集合中
for (Object o : firstList) {
nodes.add(new NodeComment((Comment) o));
}
List list =NodeComment.addAllNode(nodes, thenList);

渲染效果圖如下：

這個demo 使用了遞歸插入鏈表，遞歸查詢鏈表 但在頁面渲染數據處理是比較麻煩，建議在填寫評論時callid使用第一條評論的id