So schließen Sie einen Socket, wenn er eine Verbindung abhört

Question

Ich möchte meinen Server schließen, wenn ich die Stopptaste in meiner GUI drücke. Ich benutze diesen Code für die Steckdose, der zuhört, wenn ein Client-Verbindung zum Serversocket ist:

public void run() { 
     while (running) { 
      try { 
       if (serverSocketPassed) { 
        socket = serverSocket.accept(); 
        scanner = new Scanner(socket.getInputStream()); 
        stream = new PrintStream(socket.getOutputStream()); 
       } 
      } catch (IOException e) { 
       System.out.println("err11"); 
       e.printStackTrace(); 
      } 
     } 

    } 

Und für das Schließteil sieht der Code folgendermaßen aus:

public void stop() { 
    try { 
      serverSocket.close(); 
      running = false; 
     } catch (Exception e) { 
      System.out.println("Err"); 
      e.printStackTrace(); 
     } 
     scanner.close(); 
     stream.close(); 
} 

Aber wenn ich rufe den Anschlag Funktion, bevor ein Client verbunden: Ich bekomme einen Fehler. Diese ist der Fehler:

err11 
java.net.SocketException: socket closed 
    at java.net.DualStackPlainSocketImpl.accept0(Native Method) 
    at java.net.DualStackPlainSocketImpl.socketAccept(Unknown Source) 
    at java.net.AbstractPlainSocketImpl.accept(Unknown Source) 
    at java.net.PlainSocketImpl.accept(Unknown Source) 
    at java.net.ServerSocket.implAccept(Unknown Source) 
    at java.net.ServerSocket.accept(Unknown Source) 
    at _47b3n.server.main.Server$SocketRunner.run(Server.java:93) 
    at java.lang.Thread.run(Unknown Source) 
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
    at _47b3n.server.main.Server.stop(Server.java:42) 
    at _47b3n.server.main.ServerGUI$ActionListener.actionPerformed(ServerGUI.java:166) 
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) 
    at java.awt.Component.processMouseEvent(Unknown Source) 
    at javax.swing.JComponent.processMouseEvent(Unknown Source) 
    at java.awt.Component.processEvent(Unknown Source) 
    at java.awt.Container.processEvent(Unknown Source) 
    at java.awt.Component.dispatchEventImpl(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Window.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$500(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 

Wie kann ich richtig auf den Server schließen und es ist Komponenten?

Answer 1

Schließen Sie den Stream nicht abrupt, sondern schließen Sie den Server-Socket abrupt.

Versuchen Sie folgendes:

stream.close();