JavaFX treeview顶级作品，但子文件夹目录错误？

Question

我正在尝试为我的第一个程序项目构建一个文本编辑器。我在左侧有treeview，在右侧有tabpane。选项卡上有一个文本区域。我的意图是将在树形视图中选择的文件的内容（如果是文件）显示到文本区域。听起来足够简单吧？
我一直在努力使它正常工作，我无法弄清楚。出了点问题，这超出了我的技能水平。 任何建议表示赞赏。谢谢大家的帮助，使它成为一个了不起的教育平台！

import javafx.beans.value.ChangeListener
import javafx.beans.value.ObservableValue
import javafx.fxml.FXML
import javafx.fxml.Initializable
import javafx.scene.control.Tab
import javafx.scene.control.TabPane
import javafx.scene.control.TextArea
import javafx.scene.control.TreeItem
import javafx.scene.control.TreeView
import javafx.scene.control.cell.TextFieldTreeCell
import javafx.stage.FileChooser
import javafx.stage.Window

class Controller implements Initializable{

@FXML
TextArea inputSpace
@FXML
Tab tabName
@FXML
TabPane tabPane
@FXML
TreeView fileTree

void openAndSetTab(File file) throws FileNotFoundException{
    if(file.canRead()){
        def openFile = new Tab()
        tabPane.getTabs().add(openFile)

        //set file name to tab title
        def dotPosition = file.name.indexOf('.')
        def fileName = file.name.substring(0,dotPosition)
        openFile.text = fileName

        //add file data to text area
        def inputArea = new TextArea()
        openFile.setContent(inputArea)
        def data = file?.getText()
        inputArea.setText(data)

        //bring to front
        openFile.getTabPane().getSelectionModel().select(openFile)
    }else{
        println('Cannot read...')
        println(file.absolutePath)
    }
}

void openFile() {
    //get file
    def chooser = new FileChooser()
    def file = chooser.showOpenDialog(Window.getResource('Main.java') as Window)

    openAndSetTab(file)
}

/**
 * save text data to file
 * and set title of tab
 */
void saveFile() {
    FileChooser chooser = new FileChooser()
    def data = inputSpace.text
    def file = chooser.showSaveDialog(Window.getResource('Main.java') as Window)
    if(data != null){
        file.text = ''
        file << data
    }

    //set tab title to saved file name
    int dotPosition = file.name.indexOf('.')
    def fileName = file.name.substring(0,dotPosition)
    tabName.text = fileName
}

/**
 * stackoverflow.com Answer
 * https://stackoverflow.com/questions/38278601/javafx-treeview-directory-listing
 * answered Jul 9 '16 at 6:46
 * Author: fabian
 * Original was using CheckBoxTreeItem, I updated code to my needs
 * @param inputDirectoryLocation
 */
void displayTreeView(String inputDirectoryLocation) {
    def tree = new GetTree()

    // Creates the root item.
    TreeItem<String> rootItem = new TreeItem<>(inputDirectoryLocation)

    // Hides the root item of the tree view.
    fileTree.setShowRoot(false)

    // Creates the cell factory.
    fileTree.setCellFactory(TextFieldTreeCell.forTreeView())

    // Get a list of files.
    def fileInputDirectoryLocation = new File(inputDirectoryLocation)
    List<File> fileList = fileInputDirectoryLocation.listFiles()

    // create tree
    for (File file : fileList) {
        tree.createTree(file, rootItem)
    }

    fileTree.setRoot(rootItem)
}

@Override
void initialize(URL url, ResourceBundle resourceBundle) {
    displayTreeView(System.getProperty('user.dir'))
    fileTree.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<TreeItem>() {
        @Override
        void changed(ObservableValue<? extends TreeItem> observableValue, TreeItem treeItem, TreeItem t1) {
            def file = new File(t1.value.toString())
            if(file.isFile()){
                openAndSetTab(file)
            }
        }
    })
  }
}

我将groovy jar添加到类路径中，这就是为什么它看起来是有线的。它不是Java的超集。喜欢使用它。我在做什么错了？

GetTree类如下，

import javafx.scene.control.TreeItem

 /**
 * stackoverflow.com Answer
 * https://stackoverflow.com/questions/38278601/javafx-treeview-directory-listing
 * answered Jul 9 '16 at 6:46
 * Author: fabian
 * Original was using CheckBoxTreeItem, I updated code to my needs
 */
 class GetTree {
 static void createTree(File file, TreeItem<String> parent) {
    if (file.isDirectory()) {
        TreeItem<String> treeItem = new TreeItem<>(file.getName())
        parent.getChildren().add(treeItem)
        for (File f : file.listFiles()) {
            createTree(f, treeItem)
        }
    } else{//must be a file
        parent.getChildren().add(new TreeItem<>(file.getName()))
    }
  }

}

“项目”文件夹为

• 四卦法

  • .idea

    -sub-directories.here

  • 退出

    -sub-directories.here

  • src

    • 子目录。此处

  testing.txt

  TetraGrammaton.iml

在选项卡上的文本区域中打开的唯一文件是2个文件testing.txt和TetraGrammaton.iml。其他目录在单击时打开，但不在文本区域中打开。