Java中怎么封装一个树形结构
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。

创新互联主营龙陵网站建设的网络公司,主营网站建设方案,重庆APP开发公司,龙陵h5小程序制作搭建,龙陵网站营销推广欢迎龙陵等地区企业咨询
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 List children; }
2、数据封装
@Override public ListfindList(String name) { List list = publishServiceTypeMapper.findByName(name); if (JudgeUtil.isEmpty(list)){ return null; } //父子级组装 return parentAndChildren(list); } private List parentAndChildren(List list){ //最顶层根节点 List rootList = new ArrayList<>(); //非最顶层根节点 List 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 getTree(List rootList, List bodyList){ 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,List bodyList, Map map){ List 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": []
}
]
}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。
网站题目:Java中怎么封装一个树形结构
网站网址:http://www.jxjierui.cn/article/gcgdhg.html


咨询
建站咨询
