IllegalArgumentException:调用现有文件夹时 URI 不是分层的

IllegalArgumentException: URI is not hierarchical when calling existing folder

我正在这样做:

private boolean createCopy(String targetDirectory, String[] dataSet, String fileName, boolean overwrite) throws IOException, URISyntaxException
{
    fileName = "file:" + fileName.replace(" ","%20");
    URI uri = new URI("file:" + targetDirectory);
    Path dPath = Paths.get(uri);
    //code
 }

我得到这个例外:

Exception in thread "main" java.lang.IllegalArgumentException: URI is not hierarchical
at sun.nio.fs.WindowsUriSupport.fromUri(WindowsUriSupport.java:122)
at sun.nio.fs.WindowsFileSystemProvider.getPath(WindowsFileSystemProvider.java:92)
at java.nio.file.Paths.get(Paths.java:138)
...

Path dPath = Paths.get(uri);

行。有人知道这是为什么吗? targetDirectory 只是一个简单的文件夹,既不是 JAR 也不是 WAR 文件;如果我取消

URI uri = new URI("file:" + targetDirectory);

我刚刚得到

Exception in thread "main" java.nio.file.FileSystemNotFoundException: Provider "DRIVE_LETTER" not installed
at java.nio.file.Paths.get(Paths.java:147)
...

"DRIVE_LETTER" 最终变成 "C" 或 "D" 或 "E" 之类的东西。这是 targetDirectory 所在的驱动器。

编辑:

public static void main(String... args)
{
    Path path = null;
    try
    {
        Paths.get(new URI("file:E://HTML%20Processor//test//copies//"));
    }
    catch (URISyntaxException e)
    {
        e.printStackTrace();
    }
}

抛出完全相同的异常,因为您想知道确切的调用。

编辑:将文件放在任何其他驱动器上没有区别; USB 或 SATA 驱动器也没有区别。

应该是 file:// 而不是 file: