方法一：

/*建立樹形結構*/
public List<DeptSearchVo> builTree(){
    List<DeptSearchVo> treeMenus =new ArrayList<DeptSearchVo>();
    for(DeptSearchVo menuNode : getRootNode()) {
        menuNode=buildChilTree(menuNode);
        treeMenus.add(menuNode);
    }
    return treeMenus;
}

/*遞迴，建立子樹形結構*/
private DeptSearchVo buildChilTree(DeptSearchVo pNode){
    List<DeptSearchVo> chilMenus =new  ArrayList<DeptSearchVo>();
    for(DeptSearchVo menuNode : menuList) {
        if(menuNode.getParentId().equals(pNode.getId())) {
            chilMenus.add(buildChilTree(menuNode));
        }
    }
    pNode.setChildren(chilMenus);
    return pNode;
}

/*獲取根節點*/
private List<DeptSearchVo> getRootNode() {
    List<DeptSearchVo> rootMenuLists =new  ArrayList<DeptSearchVo>();
    for(DeptSearchVo menuNode : menuList) {
        if(menuNode.getParentId().equals("0")) {
            rootMenuLists.add(menuNode);
        }
    }
    return rootMenuLists;
}
方法二：

private List<FuncConfigVo> buildChilTree(String parentId){
    List<FuncConfigVo> list = funcConfigMapper.getFuncParentId(parentId);
    for(FuncConfigVo funcConfigVo : list) {
        String id = funcConfigVo.getId();
        List<FuncConfigVo> child = buildChilTree(id);
        if(!child.isEmpty()) {
            funcConfigVo.setChildren(child);
        }
    }
    return list;
}