实际项目中后端生成目录树的json是比较常见的，hutool中提供了treeUtil使用起来比较方便。先做个记录
通过hutool
引入hutool的jar
代码语言：javascript复制 <dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.7.16</version>
</dependency> public List<Tree<String>> findOrgTreeInfoByUserCode() {
//获取数据 设定根节点的parentId为：0
List<OrgTreeNode> orgTreeNodes = customerBoardMapper.findOrgTrees();
TreeNodeConfig treeNodeConfig = new TreeNodeConfig();
treeNodeConfig.setChildrenKey("children");
//可配置树深度
// treeNodeConfig.setDeep(2);
treeNodeConfig.setIdKey("id");
//转换器
List<Tree<String>> build = TreeUtil.build(treeNodesList, "0", treeNodeConfig,
(treeNode, tree) -> {
tree.setId(treeNode.getId().toString());
tree.setParentId(treeNode.getParentId().toString());
tree.setName(treeNode.getName());
});
return build;
}@Data
public class OrgTreeNode {
private String id;
private String parentId;
private String name;
private String belongRegionId;
private String belongRegionName;
private List<OrgTreeNode> children = new ArrayList<>();
}小测试demo
代码语言：javascript复制 @GetMapping("menu")
public String getTreeMenu(){
List<Menu> list = helloService.findMenu();
List<Menu> result =new ArrayList<>();
Map<Integer, Menu> menuMap = new HashMap<>();
for(Menu menu:list){
if(menu.getParentId()==0){
Menu menu1 =new Menu();
menu1.setId(menu.getId());
menu1.setName(menu.getName());
result.add(menu1);
menuMap.put(menu.getId(), menu1);
}else{
if(menuMap.containsKey(menu.getParentId())){
Menu menu2 = new Menu();
menu2.setId(menu.getId());
menu2.setParentId(menu.getParentId());
menu2.setName(menu.getName());
menuMap.get(menu.getParentId()).getChildren().add(menu2);
menuMap.put(menu.getId(), menu2);
}
}
}
return JSON.toJSONString(result);
}@Data
public class Menu {
private Integer id;
private Integer parentId;
private String name;
private List<Menu> children = new ArrayList<>();
}效果展示(这里的排序还需要处理)
代码语言：javascript复制[{
"children": [{
"children": [{
"children": [],
"id": 133,
"name": "添加配置",
"parentId": 24
}, {
"children": [],
"id": 134,
"name": "添加配置",
"parentId": 24
}],
"id": 24,
"name": "配置管理",
"parentId": 8
}, {
"children": [{
"children": [],
"id": 132,
"name": "日志删除",
"parentId": 25
}],
"id": 25,
"name": "日志管理",
"parentId": 8
}, {
"children": [{
"children": [],
"id": 119,
"name": "查看",
"parentId": 45
}, {
"children": [],
"id": 126,
"name": "新增",
"parentId": 45
}, {
"children": [],
"id": 127,
"name": "修改",
"parentId": 45
}, {
"children": [],
"id": 131,
"name": "禁用启用",
"parentId": 45
}],
"id": 45,
"name": "用户管理",
"parentId": 8
}, {
"children": [{
"children": [],
"id": 115,
"name": "查看",
"parentId": 46
}, {
"children": [],
"id": 116,
"name": "新增",
"parentId": 46
}, {
"children": [],
"id": 117,
"name": "修改",
"parentId": 46
}, {
"children": [],
"id": 118,
"name": "删除",
"parentId": 46
}],
"id": 46,
"name": "菜单管理",
"parentId": 8
}, {
"children": [{
"children": [],
"id": 120,
"name": "查看",
"parentId": 47
}, {
"children": [],
"id": 128,
"name": "新增",
"parentId": 47
}, {
"children": [],
"id": 129,
"name": "修改",
"parentId": 47
}, {
"children": [],
"id": 130,
"name": "删除",
"parentId": 47
}],
"id": 47,
"name": "角色管理",
"parentId": 8
}, {
"children": [],
"id": 48,
"name": "组织管理",
"parentId": 8
}],
"id": 8,
"name": "系统管理"
}]说明
JSON.toJSONString(result);需要引入fastjson的jar
代码语言：javascript复制 <dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.60</version>
</dependency>
