August 2000
Intermediate to advanced
760 pages
21h
English
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Network Methods of java.applet.AppletContext
AppletContext
is an interface that lets an applet
manipulate the environment in which it is running. Every applet has
an AppletContext field, which is a reference to an
object implementing AppletContext. In some sense,
this object represents the web browser or applet viewer that is
running the applet. (In rare cases, mostly applets started from the
command line and instantiated in the main( )
method, the AppletContext may be
null.) To access the applet’s context, call
the applet’s getAppletContext( )
method:
public AppletContext getAppletContext( )
The AppletContext must provide several methods for
the use of the applet, including getAudioClip( )
and getImage( ) methods; the
getAudioClip( ) and getImage( )
methods of java.applet.Applet merely call the
corresponding method in the applet’s
AppletContext. However, there are two overloaded
showDocument( )
methods in
java.applet.AppletContext that are relevant to
network programming and are not mirrored in
java.applet.Applet. The first takes as an argument
a single URL:
public void showDocument(URL url)
This method shows the document at URL
url in the
AppletContext’s window. It is not supported by all web browsers and applet viewers, but it is supported by Netscape, HotJava, and Internet Explorer. This method is most useful in fancy image map applets, where it is used to send the user to a new page after clicking on a hot button. For example, to send the user to the O’Reilly home page, you ...
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