删除Java中的所有空文件夹

Question

我想编写一个删除所有空文件夹的函数，可以选择忽略某些文件类型（允许的文件类型存储在哈希图中）并判断它是否应该在目录中查找。

调用：

HashMap<String, Boolean> allowedFileTypes = new HashMap<String, Boolean>();
allowedFileTypes.put("pdf", true);
deleteEmptyFolders("ABSOLUTE PATH", allowedFileTypes, true);

功能：

public static void deleteEmptyFolders(String folderPath, HashMap<String, Boolean> allowedFileTypes, boolean followDirectory) {

    File targetFolder = new File(folderPath);
    File[] allFiles = targetFolder.listFiles();


    if (allFiles.length == 0)
        targetFolder.delete();

    else {
        boolean importantFiles = false;

        for (File file : allFiles) {

            String fileType = "folder";
            if (!file.isDirectory())
                fileType = file.getName().substring(file.getName().lastIndexOf('.') + 1);

            if (!importantFiles)
                importantFiles = (allowedFileTypes.get(fileType) != null);

            if (file.isDirectory() && followDirectory)
                deleteEmptyFolders(file.getAbsolutePath(), allowedFileTypes, followDirectory);
        }

        // if there are no important files in the target folder
        if (!importantFiles)
            targetFolder.delete();
    }
}

问题是什么都没有发生，即使它查看所有文件夹直到最后。这是一个好方法还是我完全错过了什么？

Answer 1

这段代码递归删除所有空文件夹或目录：

public class DeleteEmptyDir {
private static final String FOLDER_LOCATION = "E:\\TEST";
private static boolean isFinished = false;

public static void main(String[] args) {

    do {
        isFinished = true;
        replaceText(FOLDER_LOCATION);
    } while (!isFinished);
}

private static void replaceText(String fileLocation) {
    File folder = new File(fileLocation);
    File[] listofFiles = folder.listFiles();
    if (listofFiles.length == 0) {
        System.out.println("Folder Name :: " + folder.getAbsolutePath() + " is deleted.");
        folder.delete();
        isFinished = false;
    } else {
        for (int j = 0; j < listofFiles.length; j++) {
            File file = listofFiles[j];
            if (file.isDirectory()) {
                replaceText(file.getAbsolutePath());
            }
        }
    }
}
}