FileChooser

javafx.stage.FileChooser

打开某个文件

    public static File openFileChooser() {
    
    
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("Open Resource File");
        fileChooser.getExtensionFilters().addAll(
                new ExtensionFilter("All Files", "*.*"),
                new ExtensionFilter("Text Files", "*.txt"),
                new ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"),
                new ExtensionFilter("Audio Files", "*.wav", "*.mp3", "*.aac"));
        File selectedFile = fileChooser.showOpenDialog(primaryStage);
        if (selectedFile != null) {
    
    
            return selectedFile;
        }
        return null;
    }

从上次文件打开的地方开始选择文件

注意lastFile是上次文件所在的文件夹位置

打开某个文件夹（即目录）

开始以为FileChooser就是可以，但目录选择器是 javafx.stage.DirectoryChooser

    public static File openFolderChooser() {
    
    
        DirectoryChooser folderChooser = new DirectoryChooser();
        folderChooser.setTitle("Open Folder");
        if (lastFile != null) folderChooser.setInitialDirectory(lastFile);
        File selectedfolder = folderChooser.showDialog(primaryStage);
        if (selectedfolder != null) {
    
    
            lastFile = selectedfolder;
            return selectedfolder;
        }
        return null;
    }