在Java中运行外部应用程序，但不要等待它完成 [英] Run a external application in java but don't wait for it to finish

问题描述

我正在用Java编写一个应用程序，允许我运行其他应用程序.为此，我使用了Process类对象，但是当我这样做时，应用程序会等待进程结束再退出自身.有没有一种方法可以用Java运行外部应用程序，但不要等待它完成?

I'm writing an app in java allowing me to run other applications. To do that, I've used an Process class object, but when I do, the app awaits the process to end before exiting itself. Is there a way to run external application in Java, but don't wait for it to finish?

public static void main(String[] args)
{
FastAppManager appManager = new FastAppManager();
appManager.startFastApp("notepad");
}

public void startFastApp(String name) throws IOException
{
    Process process = new ProcessBuilder(name).start(); 
}

推荐答案

ProcessBuilder.start()不等待进程完成.您需要调用Process.waitFor()以获取该行为.

ProcessBuilder.start() does not wait for process to finish. You need to call Process.waitFor() to get that behaviour.

我对此程序做了一个小测试

I did a small test with this program

public static void main(String[] args) throws IOException, InterruptedException {
    new ProcessBuilder("notepad").start();
}

在netbeans中运行时，它似乎仍在运行.使用java -jar从命令行运行时，它将立即返回.

When run in netbeans it appear to be still running. When running from command line with java -jar it returns immediately.

所以您的程序可能不会等待退出，但是您的IDE使其看起来像这样.

So your program is probably not waiting to exit, but your IDE makes it seem so.

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