java - 在java中清除没有排除文件的目录

Question

我尝试删除目录中没有文件路径在我的数组中的文件

    public static boolean deleteDir(File dir, List<String> exclusionList) throws IOException {
    if (exclusionList != null && exclusionList.contains(dir.getCanonicalPath())) { // skip file

        System.out.println("Skipped: " + dir.getCanonicalPath());
        return true;
    }

    System.out.println("Deleting: " + dir.getCanonicalPath());
    if (dir.isDirectory()) {
        File[] children = dir.listFiles();
        boolean success = true;
        for (File element : children) {
            if (!deleteDir(element, exclusionList)) {
                success = false;
            }
        }
        return success;
    }

    return dir.delete();
}

这是我的删除功能，可以很好地删除 .txt .yml 等文件，但是当它必须删除文件夹(文件夹内容删除完美)但文件夹存在时，我有很多空文件夹；/

Answer 1

该问题是由目录的处理方式引起的:

System.out.println("Deleting: " + dir.getCanonicalPath());
if (dir.isDirectory()) {
    File[] children = dir.listFiles();
    boolean success = true;
    for (File element : children) {
        if (!deleteDir(element, exclusionList)) {
            success = false;
        }
    }
    return success;   // <= for directories the method returns here
}

return dir.delete();

在目录中，该方法将为所有子元素递归调用deleteDir，并检查所有子元素是否已成功删除。之后该方法只是返回，而不删除目录本身。一个简单的解决方法是仅在删除某个子元素失败时才终止:

System.out.println("Deleting: " + dir.getCanonicalPath());
if (dir.isDirectory()) {
    File[] children = dir.listFiles();
    boolean success = true;
    for (File element : children) {
        if (!deleteDir(element, exclusionList)) {
            success = false;
        }
    }

    // return only if some child couldn't be deleted.
    if(!success)
        return false;
}

// delete the directory itself (or the file, if a file is passed as parameter)
return dir.delete();