java – 如何杀死runtime.exec？

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了java – 如何杀死runtime.exec？，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含2959字，纯文字阅读大概需要5分钟。

内容图文

我在我的jframe中使用下面的代码,以便通过java程序执行shell脚本,但是当我实现其他方法来停止运行过程时,此方法被第一个阻止,我无法停止我的程序.所以我要杀死新进程,问题是如何获取进程的pid以及如何将其置于后台,以便杀死它.

public static void execShellCmd(String cmd) {
    try {

        testPath = getPath();

        System.out.println(cmd);
        Runtime runtime = Runtime.getRuntime();
        process = runtime.exec(new String[] { "sh",
                testPath + "/install.sh", cmd, "&" });
        int exitValue = process.waitFor();
        value = exitValue;
        System.out.println("exit value: " + exitValue);
        BufferedReader buf = new BufferedReader(new InputStreamReader(
                process.getInputStream()));
        String line = "";
        BufferedWriter bufferedWriter = null;
        while ((line = buf.readLine()) != null) {
            System.out.println("exec response: " + line);
            log = line;
            writeToFile(line);
        }
    } catch (Exception e) {
        System.out.println(e);
    }
}

解决方法:

为此,您可以使用java.util.concurrent中的功能

在包含UI的现有类中,您必须添加类似于此的内容：

//class variable to store the future of your task
private Future<?> taskFuture = null;

//to be called from button "Start" action handler
public void actionStart() {

  //don't double start, if there is one already running
  if(taskFuture == null || taskFuture.isDone()) {

    //create the new runnable instance, with the proper commands to execute
    MyShellExecutor ex = new MyShellExecutor(new String[] { "sh",testPath + "/install.sh", cmd, "&" });

    //we only need one additional Thread now, but this part can be tailored to fit different needs
    ExecutorService newThreadExecutor = Executors.newSingleThreadExecutor();

    //start the execution of the task, which will start execution of the shell command
    taskFuture = newThreadExecutor.submit(ex);
  }
}

//to be called from button "Stop" action handler
public void actionStop() {
  //if not already done, or cancelled, cancel it
  if(taskFuture !=null && !taskFuture.isDone()) {
    taskFuture.cancel(true);
  }
}

执行该作业的主要组件是Runnable,我将其命名为MyShellExecutor,如下所示：

public class MyShellExecutor implements Runnable {

    //stores the command to be executed
    private final String[] toExecute;

    public MyShellExecutor(String[] toExecute) {
        this.toExecute=toExecute;
    }

    public void run() {
        Runtime runtime = Runtime.getRuntime();
        Process process = null;

        try {
            process = runtime.exec(toExecute);

            int exitValue = process.waitFor();
            System.out.println("exit value: " + exitValue);
            BufferedReader buf = new BufferedReader(new InputStreamReader(process.getInputStream()));

            String line = "";
            while ((line = buf.readLine()) != null) {
                System.out.println("exec response: " + line);
                //do whatever you need to do
            }

        } catch (InterruptedException e) {
            //thread was interrupted.
            if(process!=null) { process.destroy(); }
            //reset interrupted flag
            Thread.currentThread().interrupt();

        } catch (Exception e) {
            //an other error occurred
            if(process!=null) { process.destroy(); }
        }

    }
}

注意：在运行耗时的操作时,请确保不要在UI线程上执行此操作.这只是阻止用户,并没有提供良好的用户体验.总是做一些可能让用户在另一个线程上等待的东西.

推荐阅读：Java Concurrency In Practice

内容总结

以上是互联网集市为您收集整理的java – 如何杀死runtime.exec？全部内容，希望文章能够帮你解决java – 如何杀死runtime.exec？所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端