执行进程时 GUI 无法更新 (SwingUtilities.invokeLater)

Question

参考我之前在Unable to perform any action before Process.Runtime.exec statement line 的问题，我已将我的代码更改为两部分，一个线程类 CmdExec，其中包含执行外部程序的所有代码，如下所示：

    public class CmdExec extends Thread
     {
     private String cmd;
     private File path;

      public CmdExec() {
      }

      public CmdExec(String cmd, File path) {
      this.cmd = cmd;
      this.path = path;
      }

      public void run(){

  try
    {
        Runtime rt = Runtime.getRuntime();
        Process proc = rt.exec(cmd , null, path);
        InputStream stderr = proc.getErrorStream();
        InputStreamReader isr = new InputStreamReader(stderr);
        BufferedReader br = new BufferedReader(isr);
        String line = null;
        System.out.println("<ERROR>");
        while ( (line = br.readLine()) != null)
            System.out.println(line);
        System.out.println("</ERROR>");
        int exitVal = proc.waitFor();
        System.out.println("Process exitValue: " + exitVal);
    } catch (Throwable t)
      {
        t.printStackTrace();
      }

通过参考 jtahlborn 的答案，我还为 GUI 更新目的做了另一个 Runnable 类，如下所示：

       Runnable doWorkRunnable = new Runnable() {
        public void run() {
System.out.println("hello world");
btnTranscribe.setEnabled(false);
areaOutput.setEditable(false);
areaOutput.setEnabled(false);
areaOutput.setText("Performing segmentation, please wait till process is done\n"); }
        };

在实际运行 process.exec() 调用外部程序之前，我调用 SwingUtilities.invokeLater 更改 GUI，如下所示：

    SwingUtilities.invokeLater(doWorkRunnable);
    Runtime rt = Runtime.getRuntime();
    Process proc = rt.exec(cmd , null, path);

但是使用以上所有代码，GUI 仍然无法更新，并且仅在该过程完成后才更新。我在协调这两个可运行线程和线程的任何特定步骤上错了吗？

提前感谢您的大力帮助和回答

P / S：我在 GUI 中按下按钮期间开始执行 CmdExec()，如下所示：

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { 
     strSegment = "java -Xmx2024m -jar ./LIUM_SpkDiarization-4.2.jar / --fInputMask=" +               strAudioOut + "/%s.wav"
            + " --sOutputMask=" + strCtlOut + "/%s.ctl --sOutputFormat=ctl --            doCEClustering --cMinimumOfCluster=1 new3_20110331103858";

    CmdExec tryDemo = new CmdExec();
    tryDemo = new CmdExec(strSegment, fSegment);
    tryDemo.run();

    strExtract = "./sphinx_fe -i " + strAudioOut + "/new3_20110331103858.wav"
           + " -o " + strFeatureOut + "/new3_20110331103858.mfc";
    //System.out.println (strExtract);
    //executeCommand (strExtract, fExtract);

    tryDemo = new CmdExec(strExtract, fExtract);
    tryDemo.run();
      }

Answer 1

您需要调用 tryDemo.start()，而不是 tryDemo.run()。您正在直接运行线程，而不是产生单独的调用。