Java中怎么封装一个树形结构，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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1、实体类
@data
public class PublishServiceType implements Comparable{
/**
*
*/
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 Listchildren;
}
2、数据封装
@Override
public List findList(String name) {
Listlist = publishServiceTypeMapper.findByName(name);
if (JudgeUtil.isEmpty(list)){
return null;
}
//父子级组装
return parentAndChildren(list);
}
private ListparentAndChildren(List list){
//最顶层根节点
ListrootList = new ArrayList<>();
//非最顶层根节点
ListbodyList = new ArrayList<>();
for (PublishServiceType publishServiceType : list) {
if (StringUtils.isBlank(publishServiceType.getParentid())){
rootList.add(publishServiceType);
}else{
bodyList.add(publishServiceType);
}
}
return getTree(rootList,bodyList);
}
public List getTree(ListrootList, ListbodyList){
if (!JudgeUtil.isEmpty(bodyList)){
//声明一个map，用来过滤已操作过的数据
Map map = new HashMap<>(bodyList.size());
rootList.forEach(parent->getChild(parent,bodyList,map));
return rootList;
}else{
return rootList;
}
}
private void getChild(PublishServiceType parent,ListbodyList, Map map){
ListchildList = 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": []
}
]
}关于Java中怎么封装一个树形结构问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注创新互联行业资讯频道了解更多相关知识。
本文题目：Java中怎么封装一个树形结构
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