当" START"时,如何让我的进度条运行?单击按钮?

时间:2014-08-14 15:30:11

标签: java windows swing user-interface cmd

我目前正在尝试将进度条插入到我的java gui中。但是,当我单击“开始”按钮时,进度条不会运行。在cmd中运行的所有不同批处理文件都必须完成,然后运行进度条。但重点是什么?我希望它在按下“START”按钮时运行,当cmd中运行的所有不同批处理文件结束时,进度条也会停止。

这是我的代码:

JLabel ProgressBar = new JLabel("Progress Bar: ");
ProgressBar.setFont(new Font("Arial", Font.BOLD, 12));
ProgressBar.setBounds(100, 285, 180, 53);
contentPane.add(ProgressBar);
final JProgressBar aJProgressBar = new JProgressBar(JProgressBar.HORIZONTAL);
aJProgressBar.setBounds(185,305,184,15);
contentPane.add(aJProgressBar);

//when start button is selected
btnStart.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent args)
    {
        //the process starts
        JStartTimeTextField.setText(dateFormat.format(date));

        //the progress bar should show it running (by right)
        aJProgressBar.setIndeterminate(true);

        try 
        {
            //create new process    
            String command = "cmd /c start /wait" +DetectDrive+"\\starting.bat";

            //run process
            Process p = Runtime.getRuntime().exec(command);

            //cause this process to stop until process p is terminated
            p.waitFor();
        } 
        catch (IOException | InterruptedException e1)
        {
            e1.printStackTrace();
        }

        ......

        Date newDate = new Date();
        JStartTimeTextField.setText(dateFormat.format(newDate));

        //the progress bar should stop running (by right)
        //aJProgressBar.setIndeterminate(false);
    }
});

因此,右键...单击“开始”按钮时,应显示startTime并运行进度条。但是,只有当cmd中的所有批处理文件都完成运行时,才会显示startTime。

但就目前而言,进度条是我的首要任务。如何点击“开始”按钮,进度条运行,完成后,进度条会停止?

非常感谢任何帮助!

1 个答案:

答案 0 :(得分:0)

您正在使用相同的线程来更新JProgressBar并运行脚本。问题是你等待Process终止(p.waitFor()),因此,线程将等待而不是更新JProgressBar。正确的解决方案是使用SwingWorker 。但我认为你可以通过启动一个新的Thread来运行你的srcipt来运行。

类似的东西:

public void actionPerformed(ActionEvent args)
{
    //the process starts
    JStartTimeTextField.setText(dateFormat.format(date));

    //the progress bar should show it running (by right)
    aJProgressBar.setIndeterminate(true);
    new Thread()
    {
    public void run()
    {
    try 
    {
        //create new process    
        String command = "cmd /c start /wait" +DetectDrive+"\\starting.bat";

        //run process
        Process p = Runtime.getRuntime().exec(command);

        //cause this process to stop until process p is terminated
        p.waitFor();
    } 
    catch (IOException | InterruptedException e1)
    {
        e1.printStackTrace();
    }
    }
    }.start();   

    ......

    Date newDate = new Date();
    JStartTimeTextField.setText(dateFormat.format(newDate));

    //the progress bar should stop running (by right)
    //aJProgressBar.setIndeterminate(false);
}