Determine if PC is connected to internet

[Peter Simard]

I need to for my Swing application to determine the internet connecttion status of the host PC when it starts. How does one do this?
Pseudo-code:
if(isConnected == true)
{
execute query to download data into JTables
}
else{
show not connected pop-up;
System.exit(1);
}
Thanks for any help,
Pete

[Marcel de Jong]

Peter,
what you can do, is the following.
Also in pseudo-code
try {
execute code
} catch (NotConnectedException e) {
show pop-up;
System.exit(1);
}
Its quite a dirty trick, but it works ;-)
Greetings,
Marcel

[Peter Simard]

Hi Marcel,
Here's what I've decided to do.
inside my main method I connect to the US gov time server, If I get an aswer then i'm connected, if no answer I'm not connected.
Another hack/dirty trick, but it should suffice for the time being...

public static void main(String args[]) throws Exception
{
InetSocketAddress socketaddress = new InetSocketAddress("time.gov", 13);
    Socket time = new Socket();
    time.setSoTimeout(3000);
    String thetime;
    StringBuffer sb = new StringBuffer();
    try {
      time.connect(socketaddress,5000);
      BufferedReader br = new BufferedReader(new 
        InputStreamReader(time.getInputStream()));
      while((thetime = br.readLine())!= null) {
        sb.append(thetime);
      }
      thetime = (sb.toString()).trim();
    } catch(Exception e) {
      JOptionPane.showMessageDialog(null, "I was unable to connect to the server....\n"+
      "Please make sure you are\nconnected to the internet\n"+ 
      "and start the program over.\n\n"+
      "I am now shutting down the program...\n\nPlease click OK\n\nGood-bye.");
      System.out.println("Could not establish connection within defined time....");
      e.printStackTrace();
      System.exit(1);
    }

Or i could just connect to the database in question...using the same logic. I need coffee!
[ October 11, 2002: Message edited by: Peter Simard ]
[ October 11, 2002: Message edited by: Peter Simard ]
[ October 11, 2002: Message edited by: Peter Simard ]