public List<FolderItem> readDir(String path) throws Exception{
		String result = HttpAction("GET", "/"+ bucketname + path + "/");
		if(result == null)return null;
		List<FolderItem> list = new LinkedList<FolderItem>();
		String[] datas = result.split("\n");
		for(int i =0; i < datas.length ; i++)
			if(datas[i].indexOf("\t")>0)
			list.add(new FolderItem(datas[i]));
		return list;
	}