[5433] in java-interest
First try at an applet
daemon@ATHENA.MIT.EDU (Mike Tindell)
Thu Feb 8 16:51:44 1996
From: "Mike Tindell" <jmt@penne.engr.sgi.com>
Date: Thu, 8 Feb 1996 12:32:07 -0800
To: java-interest-digest@java.sun.com
Hello. I was playing around with the Irix Java environment and wrote a demon
dialer program. I compiled and ran it in Netscape 2.0b6 for Irix and got a
runtime exception that appeared to be a mangled variable name. Would someone
please compile and run my silly program on Windows and let me know if there is
a problem in my code or a bug in the compiler? Thanks for any help in advance.
______________________________________________________________________________
//
// A Java demon-dialer for Web browsers.
//
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class DemonDialer extends Applet {
// Will have a container local so multiple dialer threads can
// be running at once.
Button button;
DDPanel panel;
Dimension originalSize;
public void init () {
button = new Button ("DemonDialer");
add (button);
panel = new DDPanel ();
add (panel);
panel.hide ();
}
public boolean action (Event event, Object what) {
if (event.target == button) {
// This is a temporary hack, until I learn more.
originalSize = size ();
button.hide ();
resize (panel.size ());
panel.show ();
repaint ();
}
else if (event.target == panel) {
DDThread thread = new DDThread ((String) event.arg,
getAppletContext ());
// Debug code.
if (thread == null)
System.out.println ("Oops! No new thread.");
else
System.out.println ("Created new thread.");
thread.run ();
// Need to set this up with a timeout parameter.
try
thread.join (10 * 1000);
catch (InterruptedException oops)
System.out.println ("Oops! Failed join. " +
oops.getMessage () +
" - end exception message.");
System.out.println ("Back from demon dialer thread.");
panel.hide ();
button.show ();
// Need to be smarter here.
resize (originalSize);
repaint ();
}
else
System.out.println ("Got bogus action.");
return true;
}
}
class DDThread extends Thread {
URL url;
AppletContext context;
public DDThread (String urlString, AppletContext appletContext) {
try
url = new URL (urlString);
catch (IOException oops)
System.out.println ("Oops! Failed creating URL. " +
oops.getMessage () +
" - end exception message.");
// Debug code
if (url == null)
System.out.println ("Oops! Failed opening URL. " +
"Null URL returned.");
else
System.out.println ("URL is " + url.toString ());
context = appletContext;
}
public void run () {
URLConnection connection = null;
try
connection = url.openConnection ();
catch (IOException oops)
// while no connection, really want to try again
// until timeout; for now, print debug message.
System.out.println ("Oops! Failed opening URL. " +
oops.getMessage () +
" - end exception message.");
// Debug code.
if (connection == null)
System.out.println ("Oops! Failed opening URL. " +
"Null connection returned.");
else
System.out.println ("Connection is open.");
// When connect notify user; if desired, display page.
// For now just do it.
context.showDocument (url);
}
}
class DDPanel extends Panel {
TextField text;
public DDPanel () {
text = new TextField (30);
add (text);
add (new Button ("Go to"));
// Need to be smarter here...
resize (300, 80);
}
public boolean action (Event event, Object what) {
event.target = this;
event.arg = text.getText ();
return false;
}
}
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