如何在谷歌驱动器中创建文件夹而不重复？
问题是：如何在不重复的情况下在谷歌驱动器中创建文件夹？
我在这篇文章中回答了这个问题，我想与任何正在寻找类似解决方案或问题的人共享此代码。
我遇到的问题是如何在谷歌驱动器中创建文件夹路径，而不会导致dirve中的重复文件夹！
第一个函数用于检查文件夹的存在位置，传递驱动器实例和文件夹的标题，它是父母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父母引用中创建文件夹的功能，如果列表为空，那么文件夹将在谷歌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;
}
第三个函数用于在Google Drive中创建文件夹的目录路径而不重复。 为了防止谷歌驱动器中的重复文件夹，该功能将在创建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;
}
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