文件夹按照原始层级copy

　　对于文件处理的时候会有按照原始文件夹复制的需求，记录一下自己使用的复制文件夹且保留原始层级的代码

/**
 * 拷贝文件夹到文件夹
 * 递归获取所有层级
 * */
private void copyDirectory(File oldFile,String newFile){
    if (oldFile.isDirectory()){
        //copy 文件夹
        File[] files = oldFile.listFiles();
        if (files!=null||files.length != 0){
            int fileSize = files.length;
            for (int i = 0;i < fileSize; i++){
                if (files[i].isDirectory()){
                    copyDirectory(files[i],newFile);
                }else {
                    try {
                        copyFileByChannels(files[i], new File(newFile+files[i].getName()));
                    }catch (Exception e){
                        log.error(e.getMessage());
                        log.error("copy file error filePath："+files[i].getPath());
                        break;
                    }
                }
            }
        }
    }
}


//copy文件

private void copyFileByChannels(File source, File dest) throws IOException {
    try (FileChannel inputChannel = new FileInputStream(source).getChannel(); FileChannel outputChannel = new FileOutputStream(dest).getChannel()) {
        outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
    }
}