Question

问题是：如何在google驱动器中创建文件夹而不重复？

我正在回答这篇文章中的问题，我想与正在寻找类似解决方案或问题的任何人分享这些代码。

Answer 1

我遇到的问题是如何在google驱动器中创建文件夹路径，而不会在dirve中找到重复文件夹！

用于从文件标题中检查文件夹存在位置的第一个函数，传递驱动器实例和文件夹的标题，以及它的父项ID（不是标题）：

  /**
     * 
     * @param service google drive instance
     * @param title the title (name) of the folder (the one you search for)
     * @param parentId the parent Id of this folder (use root) if the folder is in the main directory of google drive
     * @return google drive file object 
     * @throws IOException
     */
    private File getExistsFolder(Drive service,String title,String parentId) throws IOException 
    {
        Drive.Files.List request;
        request = service.files().list();
        String query = "mimeType='application/vnd.google-apps.folder' AND trashed=false AND title='" + title + "' AND '" + parentId + "' in parents";
        Logger.info(TAG + ": isFolderExists(): Query= " + query);
        request = request.setQ(query);
        FileList files = request.execute();
        Logger.info(TAG + ": isFolderExists(): List Size =" + files.getItems().size());
        if (files.getItems().size() == 0) //if the size is zero, then the folder doesn't exist
            return null;
        else
            //since google drive allows to have multiple folders with the same title (name)
            //we select the first file in the list to return
            return files.getItems().get(0);
    }

用于在givien父级引用中创建文件夹的函数，如果列表为空，则该文件夹将在google驱动器的根目录中创建。

/**
 * 
 * @param service google drive instance
 * @param title the folder's title
 * @param listParentReference the list of parents references where you want the folder to be created, 
 * if you have more than one parent references, then a folder will be created in each one of them  
 * @return google drive file object   
 * @throws IOException
 */
private File createFolder(Drive service,String title,List<ParentReference> listParentReference) throws IOException
{
    File body = new File();
    body.setTitle(title);
    body.setParents(listParentReference);
    body.setMimeType("application/vnd.google-apps.folder");
    File file = service.files().insert(body).execute(); 
    return file;

}

用于在google驱动器中创建没有重复项的文件夹的目录路径的第三个函数。为了防止谷歌驱动器中的重复文件夹，该功能将在创建文件夹之前检查该文件夹是否存在。

/**
 * 
 * @param service google drive instance
 * @param titles list of folders titles 
 * i.e. if your path like this folder1/folder2/folder3 then pass them in this order createFoldersPath(service, folder1, folder2, folder3)
 * @return parent reference of the last added folder in case you want to use it to create a file inside this folder.
 * @throws IOException
 */
private List<ParentReference> createFoldersPath(Drive service,String...titles) throws IOException
{
    List<ParentReference> listParentReference = new ArrayList<ParentReference>();
    File file = null;
    for(int i=0;i<titles.length;i++)
    {
        file = getExistsFolder(service, titles[i], (file==null)?"root":file.getId());
        if (file == null)
        {
            file = createFolder(service, titles[i], listParentReference);
        }
        listParentReference.clear();
        listParentReference.add(new ParentReference().setId(file.getId()));
    }
    return listParentReference;
}

如何在没有重复的谷歌驱动器中创建文件夹？

1 个答案: