JavaFX - `isDirectory` Not Returning TRUE

问题

Why is this check not return true?

    String dirpath = getClass().getResource("../util/assets/sounds/").toString();
    File dir = new File(dirpath);
    System.out.println(dirpath);
    System.out.println(dir);
    System.out.println(dir.isDirectory());

It returns these:

file:/D:/JAVA/exercises/FX/TasksList/build/classes/taskslist/util/assets/sounds
file:\D:\JAVA\exercises\FX\TasksList\build\classes\taskslist\util\assets\sounds
false

I run it using netbeans IDE as a source code.

回答1:

getClass().getResource(...) returns a URL, not a file path string. A file path string is needed by the constructor of File.

You can try using the Paths constructor to construct a valid file path from a URI, which you can get from the resource using toUri().

So, this should work:

Files.isDirectory(
    Paths.get(
        getClass().getResource("../util/assets/sounds/").toUri()
    )
)

new File(
    getClass().getResource("../util/assets/sounds/").toUri()
).isDirectory();

I haven't got a windows machine to try that on.

Note: If you start packaging your app as jar (as is recommended), then this technique will break. The resource would not be a file, but instead a jar resource. There is no concept of a file directory in relation to a jar resource.

回答2:

It supposed to be :

String dirpath = getClass().getResource("../util/assets/sounds/").getPath();

instead of:

String dirpath = getClass().getResource("../util/assets/sounds/").toString();

And it will work.

来源：https://stackoverflow.com/questions/45292932/javafx-isdirectory-not-returning-true

标签

file

javafx