Solved

URL Connection

Posted on 1997-11-14
3
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Last Modified: 2010-04-16
I am a student and I'm engaged with the dissertation at the moment.The actually problem of my work is the following:
A web-server camera is installed local over a Hub with a PC.
In the camera(an AXIS Product) is a relay. In a Browser I can simply switch the relay by input the URL :
http://cameraname/io/relayon.txt

My question:How can I switch the relay from a Java Applet?

I've tried it like this:


private synchronized void reopenURL( URL urlOpen )
{
    try
    {
      URLConnection connect = urlOpen.openConnection();
             
      connect.setDefaultAllowUserInteraction( true );
                        
        connect.setUseCaches( false );

      connect.setDoInput( true );       

      connect.connect();

      InputStream inputstream = connect.getInputStream();

      while( inputstream.read() >= 0 );
             inputstream.close();
        }
      catch( IOException e )
      {
            String m_strIOExcept = e.getMessage();
      }
}

public void setRelayOn()
{
        try
      {
      
       URL url = newURL("http","webcam",80,"/io/input.txt");
       reopenURL(url);
}
      catch (MalformedURLException m)
      {
            String test = m.getMessage();      
      }
            
This is my own written class (not exactly of course)
The method setRelayOn() is called by the Applet.
If I debug the program there is the same mistake every time.
When I reach the line connect.connect() I receive the error message "java/net/URLConnection: field url not found"!

Thanks for your help.
0
Comment
Question by:mkaufman
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3 Comments
 
LVL 4

Accepted Solution

by:
russgold earned 100 total points
ID: 1230588
If you can normally do what you want from a browser using http, just call showDocument() on your applet context:


URL cameraSwitch = new URL( "http://cameraname/io/relayon.txt" );
getAppletContext(). showDocument( cameraSwitch );
0
 

Author Comment

by:mkaufman
ID: 1230589
I,ve tried it and it works!!!!
thank you very,very much!!!!!
0
 

Author Comment

by:mkaufman
ID: 1230590
In your example, how can I prevent, that the Browser use caches?
0

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