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Tip of the Day
Language: Java
Expertise: Intermediate
Oct 3, 2005

How to Pass Parameters from a Java Applet to an HTML File

Sometimes you need to pass parameters from an applet to an HTML file. For instance, you may want to detect, using an applet, the IP address of the viewer when they are trying to access your page and send them to a HTML page that will dynamically use it.

applet_test.java: This is the sample Java applet that returns the hostname of the machine and the IP address associated with that hostname.


--- applet_test.java ---
import java.applet.Applet;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class applet_test extends Applet {
	private InetAddress addr = null;
	public void init() {
		try {
			addr = InetAddress.getLocalHost();
		}
		catch (UnknownHostException e) {
			System.exit(0);
		}
	}
	public InetAddress getLHost() {
		return addr;
	}
}
test.html: The sample HTML file test.html calls a Java applet (applet_test.class) and gets the getLHost() parameter from this applet:

--- test.html ---
<html>
<body>
<APPLET CODE=applet_test.class Width=0 Height=0></APPLET>
<script type="text/javascript">
<!--
document.write(document.applets[0].getLHost());
//-->
</script>
</body>
</html>
Sergejs Svitnevs
 
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