Java数据封装成树形结构,多级

深碍√TFBOYSˉ_ 2023-07-15 09:24 27阅读 0赞

话不多说直接上菜

1，实体类

/**
     * @ClassName SysTagConf
     * @Description TODO
     * @Author shenWB
     * @Date 2019/5/31 10:12
     * @Version 1.0
     **/
     
      
       @Data 
       public class SysTagConf implements java.io.Serializable{ 
       private String rowGuid; //唯一标识 
       private String name; //标签名称 
       private String opType; //授权类型 0全部 1目录清单 2实施清单 3办理项 
       private String useLevel; //使用层级 0不限 2省级 3地市级 4区县级 
       private float sort; //排序 
       private String parentGuid; //父节点标识 
       private String bakNote; //备注 
       private String createUId; //创建人ID 
       private String createUName; //创建人名称 
       private String createTime; //创建时间 
       private String updateUId; //更新人ID 
       private String updateUName; //更新人名称 
       private String updateTime; //更新时间 
       private String parentName; //父节点名称 
       private List <SysTagConf> childList; 
       
       }

2,业务模块serviceImpl

/**--------------------数据封装树结构代码---------------------------*/ 
       @Override 
       public List <SysTagConf> tagConfTreeList(String deptId, List <String> opType) { 
       SysDepartment sysDepartment = departmentDao.selectDepartmentByUserId(deptId); 
       String useLevel = null;//行使层级 
       if(sysDepartment != null){ 
       if(sysDepartment.getUseLevel() != null && !"".equals(sysDepartment.getUseLevel())) { 
       useLevel = sysDepartment.getUseLevel();//行使层级赋值 
       } 
       } 
       List <SysTagConf> sysTagConfList = sysTagConfDao.tagConfTreeList(useLevel,opType); //查询所有数据 
       List <SysTagConf> rootList = new ArrayList <>(); //根节点对象存放到这里 
       List <SysTagConf> bodyList = new ArrayList <>(); //其他节点存放到这里，可以包含根节点 
       for (SysTagConf sysTagConf: sysTagConfList) { 
       if(sysTagConf != null) { 
       if (sysTagConf.getParentGuid().equals("")) { 
       rootList.add(sysTagConf);//所有父节点数据放进去 
       } else { 
       bodyList.add(sysTagConf); //其他节点数据也放进去 
       } 
       } 
       } 
       List <SysTagConf> stc = getTree(rootList,bodyList);//组装的树返给前端sb 
       return stc; 
       } 
       public List <SysTagConf> getTree(List <SysTagConf> rootList,List <SysTagConf> bodyList){ 
       if(bodyList != null && !bodyList.isEmpty()){ 
       //声明一个map，用来过滤已操作过的数据 
       Map <String,String> map = Maps.newHashMapWithExpectedSize(bodyList.size()); 
       rootList.forEach(beanTree -> getChild(beanTree,map,bodyList)); 
       return rootList; 
       } 
       return null; 
       } 
       
       public void getChild(SysTagConf treeDto,Map <String,String> map,List <SysTagConf> bodyList){ 
       List <SysTagConf> childList = Lists.newArrayList(); 
       bodyList.stream() 
       .filter(c -> !map.containsKey(c.getRowGuid())) 
       .filter(c ->c.getParentGuid().equals(treeDto.getRowGuid())) 
       .forEach(c ->{ 
       map.put(c.getRowGuid(),c.getParentGuid()); 
       getChild(c,map,bodyList); 
       childList.add(c); 
       }); 
       treeDto.setChildList(childList);//子数据集 
       } 
       /**--------------------到此结束---------------------------*/

`3返回效果`

`{     "code": 0,     "message": "操作成功",     "data": [         {             "rowGuid": "1",             "name": "1",             "opType": "1",             "useLevel": "1",             "sort": 1,             "parentGuid": "",             "bakNote": "1",             "createUId": "1",             "createUName": "1",             "createTime": "1",             "updateUId": "1",             "updateUName": "1",             "updateTime": "1",             "parentName": null,             "childList": [                 {                     "rowGuid": "2",                     "name": "2",                     "opType": "1",                     "useLevel": "1",                     "sort": 2,                     "parentGuid": "1",                     "bakNote": "2",                     "createUId": "2",                     "createUName": "2",                     "createTime": "2",                     "updateUId": "2",                     "updateUName": "2",                     "updateTime": "2",                     "parentName": null,                     "childList": [                         {                             "rowGuid": "3",                             "name": "3",                             "opType": "1",                             "useLevel": "1",                             "sort": 3,                             "parentGuid": "2",                             "bakNote": "3",                             "createUId": "3",                             "createUName": "3",                             "createTime": "3",                             "updateUId": "3",                             "updateUName": "3",                             "updateTime": "3",                             "parentName": null,                             "childList": []                         }                     ]                 }             ]         }     ],     "messageId": null }`

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