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我最近为我的应用程序开发了一个 GUI,它在 Linux Ubuntu 10.04 上运行 shell 脚本。直到今天它工作正常。我设计了一个按钮,单击该按钮将打开选择文件的提示。JFileChooser 用于操作。但是从今天早上开始,没有任何错误,单击该按钮不会执行任何操作。它不只是突然工作。这是什么错误?有人可以帮忙吗?这是与安装的 OS/Java 相关的任何错误吗?

提前致谢。

int yorn = JOptionPane.YES_OPTION;
String user = System.getProperty("user.home");
File file = new File(user+"/.afile");
if (file.exists()){
    yorn = JOptionPane.showConfirmDialog(this,"There seem to have a Previous project , Do you want to back up??");

    if (yorn == JOptionPane.YES_OPTION){ // yesoption clicked!

        //choose folder to open!
        JFileChooser jf = new JFileChooser();
        jf.setDialogTitle("Back up location?");
        String pathname = null;
        jf.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        jf.showOpenDialog(null);
        File f = jf.getSelectedFile();
        pathname = f.getAbsolutePath();
        // JOptionPane.showMessageDialog(this,pathname);
        try{
            Process copy = Runtime.getRuntime().exec("sh "+user+"/myprojects/.backup.sh "+pathname);
        }
        catch(Exception e){
            JOptionPane.showMessageDialog(this, e);
        }

        //open file for analysing..
        JOptionPane.showMessageDialog(this,"Backing up complete.. ");

        JFileChooser jf2 = new JFileChooser();
        jf2.setDialogTitle("Open the Codebase");
        String pathname2 = null;
        jf2.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        jf2.showOpenDialog(null);
        File f2 = jf2.getSelectedFile();
        pathname2 = f2.getAbsolutePath();
        String username = System.getProperty("user.home");
        File writefile = new File(username+"/.afile");              

        Writer output = null;
        try {
            output = new BufferedWriter(new FileWriter(writefile));
            output.write(pathname2);
            output.close();

            //    JOptionPane.showMessageDialog(this,username);
        } catch (IOException ex) {
            Logger.getLogger(MainWindow.class.getName()).log(Level.SEVERE, null, ex);
        }

    } else if (yorn == JOptionPane.NO_OPTION){       

        JFileChooser jf = new JFileChooser();
        jf.setDialogTitle("Open the Codebase");
        String pathname = null;
        jf.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        jf.showOpenDialog(null);
        File f = jf.getSelectedFile();          
        pathname = f.getAbsolutePath();
        String username = System.getProperty("user.home");
        File writefile = new File(username+"/.afile");              
        Writer output = null;
        try {
            output = new BufferedWriter(new FileWriter(writefile));
            output.write(pathname);
            output.close();

            //    JOptionPane.showMessageDialog(this,username);
        } catch (IOException ex) {
            Logger.getLogger(MainWindow.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
} 

这是代码。它的作用是检查文件是否存在,如果存在,则提示进行备份。如果备份是,则备份并打开一个新窗口以进行另一个选择,如果备份是否,则打开文件选择。正如我所提到的,这一直有效,直到我问这个问题。它突然停止工作。感谢所有的答复。

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1 回答 1

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您应该按照之前的要求提供一个示例,但这是一段对我有用的代码,在 linux/MAC OS/Windows 下进行了测试:

/* chooser is of type JFileChooser of course */
chooser.setDialogTitle("title of your dialog");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY /* change it to fit your needs */);
chooser.setAcceptAllFileFilterUsed(false);
chooser.showOpenDialog(null);
于 2012-08-06T07:21:29.930 回答