单击 JAVAFXML 按钮场景构建器

Question

@FXML
void handleButtonAction(ActionEvent event) {
    buttonOpenFile.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            JFileChooser fileChooser = new JFileChooser();
            fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
            int result = fileChooser.showOpenDialog(null);
            if (result == JFileChooser.APPROVE_OPTION) {
                File selectedFile = fileChooser.getSelectedFile();
                openFiletxtField.setText(selectedFile.getAbsolutePath());
                System.out.println("Selected file: " + selectedFile.getAbsolutePath());
            }

        }
    });

    buttonSaveFile.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {

            File file = new File("Details.txt");
            try {
                FileOutputStream fOut = new FileOutputStream(file, true);
                OutputStreamWriter osw = new OutputStreamWriter(fOut);
                osw.write("whatever you need to write");
                JOptionPane.showMessageDialog(null, "Saved Successfully..");
                osw.flush();
                osw.close();
            } catch (IOException iOException) {
                System.out.println("" + iOException.getMessage());
            }

        }
    });

}

我在使用 javafx fxml 按钮单击事件时遇到问题。每当我单击一次按钮时，什么都没有发生。我必须第二次点击它才能工作？我可能做错了什么？我在上面分享了我的代码。我正在使用场景构建器，除了这个错误之外，我已经准备好了所有东西。除此问题外，一切正常。代码从计算机目录加载文本文件，并将数据保存到加载的文件中。

Answer 1

@FXML
void handleOpenFileButtonAction(ActionEvent event) {

    JFileChooser fileChooser = new JFileChooser();
    fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
    int result = fileChooser.showOpenDialog(null);
    if (result == JFileChooser.APPROVE_OPTION) {
        File selectedFile = fileChooser.getSelectedFile();
        openFiletxtField.setText(selectedFile.getAbsolutePath());
    }

}

@FXML
void handleSaveFileButtonAction(ActionEvent event) {
    File file = new File("Details.txt");
    try {
        FileOutputStream fOut = new FileOutputStream(file, true);
        OutputStreamWriter osw = new OutputStreamWriter(fOut);
        osw.write(firstNametxtField.getText() + "," + lastNametxtField1.getText() + "," + enrolledCheckBox.isSelected() + "," + addresstxtField.getText() + "," + statesCombobox.getSelectionModel().getSelectedItem().toString() + "\n");
        JOptionPane.showMessageDialog(null, "Saved Successfully..");
        osw.flush();
        osw.close();
    } catch (IOException iOException) {
        System.out.println("" + iOException.getMessage());
    }
}