Evaluate of a return Message in Java

When I input the URL http://cameraname/io/relayon.txt in a Browser, I can switch on the relay in a camera web server. The server then gives the back the Message Relay is on that I can see in the Browser. My question is, how can I evaluate  
this Message in Java? Maybe with InputStream or DataInputStream or FileInputStream or otherwise?
I've tried it like this, but it does not work:

URL urlOpen = new URL(http://cameraname/io/relayon.txt);
URLConnection connect = urlOpen.openConnection();
connect.setDefaultAllowUserInteraction( true);
connect.setUseCaches( false );      
connect.setDoInput( true );            
connect.setDoOutput( false );       
connect.connect();

DataInputStream inputstream = new DataInputStream( connect.getInputStream()      );
                  
while( (String s=inputstream.readLine()) != null );
{
      // do whatever you want to do with s
}
inputstream.close();

Thanks, Mike
mkaufmanAsked:
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remboCommented:

You were close:

DataInputStream dis;

URL urlOpen = new URL(http://cameraname/io/relayon.txt);

dis = new DataInputStream(urlOpen.openStream());

String s;

while ((s = dis.readLine()) != null) {
  System.out.println(s);
  //Or whatever it is you do :)
}
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mkaufmanAuthor Commented:
I've tried it but it does not work.
The String s is always empty. Have I maybe to wait a moment to the answer from the server?
Then I could wait for it in a Thread.

Thank Mike

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