Opening a URL from an Applet
Introduction
This is the example of opening a url in same window from an applet. This program shows that
how a url is opened in same document or browser window.
In this program you will see that many features have been used for
opening url from an applet. This program is using two functions in which one is init()
and another is actionPerformed(ActionListener
ae).
Function init() is self executed when the program
is loaded on the browser. In the init() function a
button labeled "Google" is created and it's action is performed using
the statement b.addActionListener(this)
which passes the object. And all the actions are performed in the another one function actionPerformed(ActionEvent
ae) which gets the object ae
of the ActionEvent class. Object ae
tells you about the source of the event through ae.getSource()
which is stored in the Button type source variable after changing
the type of
the retrieved event-source object and source.getLabel()
gives you the caption of the button.
AppletContext has been used in this program. In fact AppletContext
is the interface defines the methods, that allow an applet to interact with
the
context in which it runs (which is usually a Web browser or an applet viewer).
And getAppletContext() is used to the
reference for the AppletContext interface. To get the AppletContext of the
applet getAppletContext() function can be used. We have used the function
getAppletContext.showDocument(u,"_self")
that loads the web page linked to the url. In the first case
the applet page will be replaced. In the second case, _self is the target which
can be :
- "_self" - show
in current frame
- "_parent" - show in parent container
- "_top" -
show in topmost frame
- "_blank" - show in a new,
top-level window
- "string" - show in a
frame with that string name.
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.awt.event.*;
public class tesURL extends Applet implements ActionListener{
public void init(){
String link_Text = "google";
Button b = new Button(link_Text);
b.addActionListener(this);
add(b);
}
public void actionPerformed(ActionEvent ae){
//get the button label
Button source = (Button)ae.getSource();
String link = "http://www."+source.getLabel()+".com";
try
{
AppletContext a = getAppletContext();
URL u = new URL(link);
// a.showDocument(u,"_blank");
// _blank to open page in new window
a.showDocument(u,"_self");
}
catch (MalformedURLException e){
System.out.println(e.getMessage());
}
}
}
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