以前上學的時候學遞迴的時候總是會很糊塗，不知道在哪個點重新進入遞迴迴圈……但是看別人的程式碼又會覺得很好並且意猶未盡，借鑑學習吧……

public JSONArray initGrid(Grids parent,User user){
		
List<Grids> parents=new ArrayList<>();
	JSONArray result = new JSONArray();
	if (RoleUtil.hasRole(user, "ROLE_SYSTEM") || RoleUtil.hasRole(user, "ROLE_ZX")
				|| RoleUtil.hasRole(user, "ROLE_ZG")) {
		// ROLE_SYSTEM:超級管理員 ROLE_ZX：省中心管理員 ROLE_ZG：省主管
		if (parent == null) {
			parents = gridsRepository.findByParentIsNullOrderByCreateDateAsc();
		} else {
			parents = gridsRepository.findByParentOrderByCreateDateAsc(parent);
		}
	} else if (RoleUtil.hasRole(user, "ROLE_SZX") || RoleUtil.hasRole(user, "ROLE_SZG")){
			// 市中心管理員
            if (parent == null) {
                parents = gridsRepository.findByGridManagerIDAndGridTypeIsOrderByCreateDateAsc(user.getId(),"nav");
                removeItem(parents);
            } else {
                parents = gridsRepository.findByParentOrderByCreateDateAsc(parent);
            }
	} 
		
	for (Grids grid : parents) {
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("id", grid.getId());
		map.put("text", grid.getGridName());
		map.put("type", grid.getGridType());
		map.put("gridManager", grid.getGridManager());
		JSONArray children = initGrid(grid,user);
		map.put("children", children);
		result.add(map);
	}
	return result;
}