Question

我以正确的方式退出线程时遇到了问题。我修改了一些代码，帮助我从我的代码中在Commandline窗口中运行可执行文件。在此之前，代码工作正常。问题是，在我调用的程序完成并返回命令行后，一个线程继续运行，如何获取完成的信息以及如何正确杀死它？我已经尝试了几个等待和通知的选项，但我无法让它们工作。谢谢你的帮助，这是我的代码：

public class InnExec {

    String wkdir;
    static String ActCommand;
    static String InFile;



    InnExec(String wkdir, String ActCommand, String InFile) {
        InnExec.ActCommand=ActCommand;
        this.wkdir=wkdir;
        InnExec.InFile=InFile;
    }
    public Process Run() throws IOException, InterruptedException {
    File wkdir=new File(this.wkdir);


    ProcessBuilder processBuilder= new ProcessBuilder();
    Boolean Windows=true;
    if (!System.getProperty("os.name").contains("Windows")){
        Windows=false;
    }
    if(Windows){
        processBuilder.command("cmd.exe").redirectErrorStream(true);
    }
    else{
        processBuilder.command("/bin/bash").redirectErrorStream(true);
    }
    processBuilder.directory(wkdir);
      Process process = processBuilder.start();
      Thread processOutputHandlerThread=createAndStartProcessOutputHandlerThread(process);
      Thread processInputHandlerThread =createAndStartProcessInputHandlerThread(process);

  return process;



    }
    private static Thread createAndStartProcessInputHandlerThread(final Process process) {
        Thread thread = new Thread(new Runnable() {
          public void run() {
            PrintWriter printWriter = new PrintWriter(process.getOutputStream());
            //Scanner scanner = new Scanner(System.in);
            try {
                printWriter.println(ActCommand+"<"+InFile);
                printWriter.flush();
               Thread.sleep(50);
              }
             catch (InterruptedException interruptedException) {
                 //
            }

          }
        });
        thread.start();

        return thread;
      }



    private static Thread createAndStartProcessOutputHandlerThread(final Process process) {
        Thread thread = new Thread(new Runnable() {
          public void run() {
            try {

              char c = Character.MAX_VALUE;
              while ((c = (char) process.getInputStream().read()) != Character.MAX_VALUE) {
                  System.out.print(c);

               // Ausgabe auf Java Console

              }

            } catch (IOException e) {
              e.printStackTrace();
            }

          }

        });
        thread.start();

        return thread;
      }



}

Answer 1

您可以使用CountDownLatch

在main方法中，您可以定义您将拥有多少个线程，将其注入每个线程并等待它们完成。一旦线程完成，它将调用倒计时api，一旦你的所有线程完成，你的main方法可以继续进行。

等待命令行线程完成并以适当的方式退出

1 个答案: