Java数据封装树形结构代码实例

这篇文章主要介绍了java数据封装树形结构代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1、实体类

@data
public class publishservicetype implements comparable<publishservicetype>{


  /**
   * 
   */
  private static final long serialversionuid = -3572108154932898825l;


  /* 
   * @see [code]
   * @comment 类型标识
   */
  private string code;
  /* 
   * @see {createtime}
   * @comment 创建时间
   */
  private java.util.date createtime;
  /* 
   * @see {defaultmanual}
   * @comment 服务类型默认使用手册
   */
  private string defaultmanual;
  /* 
   * @see {description}
   * @comment 服务类型描述
   */
  private string description;
  /* 
   * @see {id}
   * @comment 主键
   */
  private string id;
  /* 
   * @see {isdelete}
   * @comment 是否可以删除
   */
  private integer isdelete;
  /* 
   * @see {lastmodifytime}
   * @comment 最近修改时间
   */
  private java.util.date lastmodifytime;
  /* 
   * @see {name}
   * @comment 服务类型名称
   */
  private string name;
  /* 
   * @see {parentid}
   * @comment 服务类型父节点
   */
  private string parentid;

  /**
   * 排序
   */
  private integer sort;

  private list<publishservicetype>children;
}

2、数据封装

@override
  public list<publishservicetype> findlist(string name) {
    list<publishservicetype>list = publishservicetypemapper.findbyname(name);
    if (judgeutil.isempty(list)){
      return null;
    }
    //父子级组装
    return parentandchildren(list);
  }
 private list<publishservicetype>parentandchildren(list<publishservicetype> list){

    //最顶层根节点
    list<publishservicetype>rootlist = new arraylist<>();
    //非最顶层根节点
    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)){
      //声明一个map，用来过滤已操作过的数据
      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,bodylist,map);
               childlist.add(c);
             });
    
    parent.setchildren(childlist);
  }

3、结果

{
 "code": 20000,
 "message": "成功",
 "data": [
  {
   "code": null,
   "createtime": null,
   "defaultmanual": null,
   "description": null,
   "id": "dc1d70b9eb7b4df3bbe8dcc6a93cbd57",
   "isdelete": -1,
   "lastmodifytime": null,
   "name": "基础服务",
   "parentid": "",
   "sort": 1,
   "children": [
    {
     "code": null,
     "createtime": null,
     "defaultmanual": null,
     "description": null,
     "id": "b1779671ef1b45e0a9a8a1edbff03f1e",
     "isdelete": -1,
     "lastmodifytime": null,
     "name": "数据源服务",
     "parentid": "dc1d70b9eb7b4df3bbe8dcc6a93cbd57",
     "sort": 2,
     "children": [
      {
       "code": null,
       "createtime": null,
       "defaultmanual": null,
       "description": null,
       "id": "2a38a8254ec348e9b54c9bf4622f23db",
       "isdelete": 1,
       "lastmodifytime": null,
       "name": "测试添加数据库服务2",
       "parentid": "b1779671ef1b45e0a9a8a1edbff03f1e",
       "sort": null,
       "children": []
      }
     ]
    },
    {
     "code": null,
     "createtime": null,
     "defaultmanual": null,
     "description": null,
     "id": "d4f3b047dc2d467a9b404ded8acf4673",
     "isdelete": 1,
     "lastmodifytime": null,
     "name": "text_lsa",
     "parentid": "dc1d70b9eb7b4df3bbe8dcc6a93cbd57",
     "sort": null,
     "children": []
    }
   ]
  },
  {
   "code": null,
   "createtime": null,
   "defaultmanual": null,
   "description": null,
   "id": "af1b4a4d2f074fa19e1dae0a5540a5bf",
   "isdelete": 1,
   "lastmodifytime": null,
   "name": "测试添加1",
   "parentid": "",
   "sort": null,
   "children": []
  },
  {
   "code": null,
   "createtime": null,
   "defaultmanual": null,
   "description": null,
   "id": "62e15d859a224126884888a55df355a7",
   "isdelete": 1,
   "lastmodifytime": null,
   "name": "测试添加2",
   "parentid": "",
   "sort": null,
   "children": []
  }
 ]
}

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