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

@datapublic 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": [] } ]}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。