Wie um zu überprüfen, ob mein thread ist die Ausführung von Java

Thread-Klasse

 public class MyDaemon implements Runnable {
     private volatile boolean running = false;

     public void setRunning(boolean isRunning){
          this.running = isRunning;
     }

     public boolean isRunning(){
          return running ; 
     }

     public void run(){
          **running = true;**
          while(running){
              //your code here
          }

     }
 }

Thread Exception-Handler setzt die variable im Falle der Ausnahme

 public class ThreadExceptionHandler implements Thread.UncaughtExceptionHandler {
        private Thread thread;

        private Throwable exception;

        public void uncaughtException(Thread t, Throwable e) {
            thread = t;
            exception = e;
            thread.setRunning(false);
        }
    }

Ihre Start - /Stop-Methode erhalten die variable aus dem ServletContext und überprüfen isRunning Methode. Und dann verwenden setRunning () - Methode.

BEARBEITET

Dein code sollte

Thread dt = (Thread)this.getServletContext().getAttribute("myDaemon");
if(dt != null){ 
     if (dt.isRunning()){  
         //Running so you can only check STOP command
         if (yourCommand == 'STOP'){
            dt.setRunning(false);
         }             
     }
     else {
         //Not Running so check START command
         if (yourCommand == 'START'){
            dt.start();
         }
     }
}
else{
    //First time
   //create exception handler for threads
ThreadExceptionHandler threadExceptionHandler = new ThreadExceptionHandler();
//start Daemon thread
Thread dThread = new Thread(new MyDaemon (), "Daemon");
dThread.setUncaughtExceptionHandler(threadExceptionHandler);
dThread.setDaemon(true);  
dThread.start();
//now save this dThread so servlet context
this.getServletContext().setAttribute("myDaemon", dThread); 
}

Ich hoffe, das hilft.