java - 打开不带扩展名的文件 - Java

Question

我正在为我的大学做一个项目，我的保存/打开文件工作正常，但我需要它们保存为我想要的扩展名，并像这样打开。例如:当我单击“保存文件”时，我将名称 testFile 写入文件名并单击“保存”，现在我的代码必须保存为我想要的扩展名。打开文件同样有效，如果我编写 testFile 并点击打开，它必须找到 testFile.txt。任何人都可以帮我我该怎么做？请按照我下面的代码操作。

private class SalvaDesenho implements ActionListener {
    private Component parent;
    SalvaDesenho(Component parent) {
        this.parent = parent;
    }
    public void actionPerformed(ActionEvent e) {
        try {


        final JFileChooser fc = new JFileChooser();
        fc.setFileFilter(new FileNameExtensionFilter("Arquivo de Texto (.txt)", "txt"));  
        fc.setAcceptAllFileFilterUsed(false);
        int returnVal = fc.showSaveDialog(parent);


        if (returnVal != JFileChooser.APPROVE_OPTION)
            return;
        int op = 0;
        if (fc.getSelectedFile().exists()) {
            Object[] options = { "Sim", "Não" };
            op = JOptionPane.showOptionDialog(null, "O arquivo já existe deseja substituilo?", "Warning",
                    JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,
                        null, options, options[1]);
        }
        if (op != 0) return;

        System.out.println("Salvando: " + fc.getSelectedFile().getPath());

        FileOutputStream fout = new FileOutputStream(fc.getSelectedFile());
        ObjectOutputStream oos = new ObjectOutputStream(fout);
        oos.writeObject(figuras);
        isSaved = true;
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

private class AbreDesenho implements ActionListener {
    private Component parent;
    AbreDesenho(Component parent) {
        this.parent = parent;
    }
    public void actionPerformed(ActionEvent e) {
        try {
        final JFileChooser fc = new JFileChooser();
        FileNameExtensionFilter txtFilter = new FileNameExtensionFilter("Arquivo de texto (.txt)", "txt");
        fc.setFileFilter(txtFilter);


        int returnVal = fc.showOpenDialog(parent);

        if (returnVal != JFileChooser.APPROVE_OPTION)
            System.out.println("File error!");

        System.out.println("Abrindo: " + fc.getSelectedFile().getPath());

        FileInputStream fin = new FileInputStream(fc.getSelectedFile());
        ObjectInputStream ois = new ObjectInputStream(fin);
        figuras = (Vector<Figura>) ois.readObject();
        } catch (Exception ex) {
            ex.printStackTrace();
        return;
        }
    pnlDesenho.getGraphics().clearRect(0 , 0, parent.getHeight(), parent.getWidth());
    for (int i=0 ; i<figuras.size(); i++)
        figuras.get(i).torneSeVisivel(pnlDesenho.getGraphics());
    }
}

谢谢。

Answer 1

您必须手动执行此操作:

• 从 JFileChooser 获取 File 对象
• 使用 getAbsolutePath() 以 String 形式获取其绝对路径。
• 检查是否有扩展名:Check file extension in Java
• 如果没有，请将您的扩展名添加到路径中:path = path+".txt";
• 从路径创建一个新的File对象:File file = new File(path)
• 打开/保存文件(您的代码)