java - 如何打開程序並檢測程序何時關閉

Question

我的主要方法是打開一個應用程序，並在完成執行後將running設置爲false，唯一的問題是我只想將running設置爲false，已打開的應用已關閉。有沒有簡單的方法來做到這一點？

這是我的代碼：

Runtime runtime = Runtime.getRuntime(); 
boolean running = true; 
try { 
    Process p = runtime.exec("open test.app"); 
    p.waitFor(); 
} catch (InterruptedException e) {} 
running = false; 

編輯：會發生什麼，此刻的是它開啓test.app，然後設置running到，即使該應用程序仍在運行錯誤。

Answer 1

似乎open啓動應用程序並退出。所以你仍然可以看到一些正在運行的東西，而java看到這個過程已經完成我猜你是在MacOS上做的。我從來沒有觸摸自己的Mac電腦，但文檔，你需要通過-W選項強制open等待應用程序終止open命令狀態：Process p = runtime.exec("open -W test.app");

Answer 2

/** 
* Detects when a process is finished and invokes the associated listeners. 
*/ 
public class ProcessExitDetector extends Thread { 

    /** The process for which we have to detect the end. */ 
    private Process process; 
    /** The associated listeners to be invoked at the end of the process. */ 
    private List<ProcessListener> listeners = new ArrayList<ProcessListener>(); 

    /** 
    * Starts the detection for the given process 
    * @param process the process for which we have to detect when it is finished 
    */ 
    public ProcessExitDetector(Process process) { 
     try { 
      // test if the process is finished 
      process.exitValue(); 
      throw new IllegalArgumentException("The process is already ended"); 
     } catch (IllegalThreadStateException exc) { 
      this.process = process; 
     } 
    } 

    /** @return the process that it is watched by this detector. */ 
    public Process getProcess() { 
     return process; 
    } 

    public void run() { 
     try { 
      // wait for the process to finish 
      process.waitFor(); 
      // invokes the listeners 
      for (ProcessListener listener : listeners) { 
       listener.processFinished(process); 
      } 
     } catch (InterruptedException e) { 
     } 
    } 

    /** Adds a process listener. 
    * @param listener the listener to be added 
    */ 
    public void addProcessListener(ProcessListener listener) { 
     listeners.add(listener); 
    } 

    /** Removes a process listener. 
    * @param listener the listener to be removed 
    */ 
    public void removeProcessListener(ProcessListener listener) { 
     listeners.remove(listener); 
    } 
} 

使用方法如下：

... 
processExitDetector = new ProcessExitDetector(program); 
processExitDetector .addProcessListener(new ProcessListener() { 
    public void processFinished(Process process) { 
     System.out.println("The program has finished."); 
    } 
}); 
processExitDetector.start(); 

來源（S）： Detecting Process Exit in Java