将数据转换为树形结构——后端处理

list.stream().filter(org -> org.getPid().equals("0")).peek(org -> org.setChildren(getChildrens(org, list))).collect(Collectors.toList());//list是数据集合

public List<Object> getChildrens(Object object, List<Object> list) {
    List<Object> childrens = list.stream().filter(u -> Objects.equals(u.getPid(), list.getId())).map(
            u -> {
                if (u.getType().equals("ENTERPROSE")) {
                    u.setChildren(null);//子节点
                } else {
                    u.setChildren(getChildrens(u, list));
                }
                return u;
            }
    ).collect(Collectors.toList());
    return childrens;
}