這篇文章主要介紹了Java資料封裝樹形結構程式碼例項,文中通過示例程式碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下

1、實體類

@data
public class PublishServiceType implements Comparable<PublishServiceType>{


  /**
   * 
   */
  private static final long serialVersionUID = -3572108154932898825L;


  /* 
   * @see [code]
   * @comment 型別標識
   */
  private String code;
  /* 
   * @see {createtime}
   * @comment 建立時間
   */
  private java.util.Date createtime;
  /* 
   * @see {defaultmanual}
   * @comment 服務型別預設使用手冊
   */
  private String defaultmanual;
  /* 
   * @see {description}
   * @comment 服務型別描述
   */
  private String description;
  /* 
   * @see {id}
   * @comment 主鍵
   */
  private String id;
  /* 
   * @see {isdelete}
   * @comment 是否可以刪除
   */
  private Integer isdelete;
  /* 
   * @see {lastmodifytime}
   * @comment 最近修改時間
   */
  private java.util.Date lastmodifytime;
  /* 
   * @see {name}
   * @comment 服務型別名稱
   */
  private String name;
  /* 
   * @see {parentid}
   * @comment 服務型別父節點
   */
  private String parentid;

  /**
   * 排序
   */
  private Integer sort;

  private List<PublishServiceType>children;
}

2、資料封裝

@Override
  public List<PublishServiceType> findList(String name) {
    List<PublishServiceType>list = publishServiceTypeMapper.findByName(name);
    if (JudgeUtil.isEmpty(list)){
      return null;
    }
    //父子級組裝
    return parentAndChildren(list);
  }
 private List<PublishServiceType>parentAndChildren(List<PublishServiceType> list){

    //最頂層根節點
    List<PublishServiceType>rootList = new ArrayList<>();
    //非最頂層根節點
    List<PublishServiceType>bodyList = new ArrayList<>();
    for (PublishServiceType publishServiceType : list) {
      if (StringUtils.isBlank(publishServiceType.getParentid())){
        rootList.add(publishServiceType);
      }else{
        bodyList.add(publishServiceType);
      }
    }
    return getTree(rootList,bodyList);
  }

  public List<PublishServiceType> getTree(List<PublishServiceType>rootList,List<PublishServiceType>bodyList){
    if (!JudgeUtil.isEmpty(bodyList)){
      //宣告一個map，用來過濾已操作過的資料
      Map<String,String> map = new HashMap<>(bodyList.size());
      rootList.forEach(parent->getChild(parent,bodyList,map));
      return rootList;
    }else{
      return rootList;
    }
  }

  private void getChild(PublishServiceType parent,List<PublishServiceType>bodyList,Map<String,String> map){
    List<PublishServiceType>childList = new ArrayList<>();
    bodyList.stream().filter(c->!map.containsKey(c.getId()))
             .filter(c->c.getParentid().equals(parent.getId()))
             .forEach(c->{
               map.put(c.getId(),c.getParentid());
               getChild(c,map);
               childList.add(c);
             });
    
    parent.setChildren(childList);
  }

3、結果

{
 "code": 20000,"message": "成功","data": [
  {
   "code": null,"createtime": null,"defaultmanual": null,"description": null,"id": "dc1d70b9eb7b4df3bbe8dcc6a93cbd57","isdelete": -1,"lastmodifytime": null,"name": "基礎服務","parentid": "","sort": 1,"children": [
    {
     "code": null,"id": "b1779671ef1b45e0a9a8a1edbff03f1e","name": "資料來源服務","parentid": "dc1d70b9eb7b4df3bbe8dcc6a93cbd57","sort": 2,"children": [
      {
       "code": null,"id": "2a38a8254ec348e9b54c9bf4622f23db","isdelete": 1,"name": "測試新增資料庫服務2","parentid": "b1779671ef1b45e0a9a8a1edbff03f1e","sort": null,"children": []
      }
     ]
    },{
     "code": null,"id": "d4f3b047dc2d467a9b404ded8acf4673","name": "text_lsa","children": []
    }
   ]
  },{
   "code": null,"id": "af1b4a4d2f074fa19e1dae0a5540a5bf","name": "測試新增1","children": []
  },"id": "62e15d859a224126884888a55df355a7","name": "測試新增2","children": []
  }
 ]
}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。