/**
     * 获取路径下的所有文件/文件夹
     * @param directoryPath 需要遍历的文件夹路径
     * @return
     */
   public static List<String> getAllFile(String directoryPath) {
        LinkedList list = new LinkedList();
        if(directoryPath==null){
            return list;
        }
        File baseFiles = new File(directoryPath);
        if (baseFiles==null||baseFiles.isFile() || !baseFiles.exists()) {
            return list;
        }
        File[] files = baseFiles.listFiles();
        if (files==null) {
            return list;
        }
        for (File file : files) {
             if (file==null) {
                continue;
             }
            if (file.isDirectory()) {
                list.addAll(getAllFile(file.getAbsolutePath()));
            } else {
                list.add(file.getAbsolutePath());
            }
        }
        return list;
    }