package ch06;
//listing 7
// A Swing-based applet that uses the showDocument()
// method defined by AppletContext to display a
// a web page. It takes two parameters. The first
// specifies the URL of the primary web site and the second
// specifies the URL of a secondary web site.
// The user selects which site to display by checking
// or clearing a check box. Pressing the Show Page Now
// button causes the page to be displayed.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
/*
<applet code="ShowURL" width=220 height=100>
<param name=primarySite value=HerbSchildt.com>
<param name=SecondarySite value=McGrawHill.com>
<param name=default value=0>
</applet>
*/
public class ShowURL extends JApplet {
JLabel jlab;
JCheckBox jcbPrimary;
String primary;
String secondary;
/**
* Initialization method that will be called after the applet is
loaded
* into the browser.
*/
@Override
public void init() {
// TODO start asynchronous download of heavy resources
primary = getParameter("primarySite");
secondary = getParameter("secondarySite");
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
makeGUI();
}
});
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
// Initialize the GUI.
private void makeGUI() {
// Set the content pane's layout to flow layout.
setLayout(new FlowLayout());
// Note: If you are using a version of Java prior to
// JDK 5, then you will need to use getContentPane()
// to explicitly set the content pane's layout,
// as shown here:
//
// getContentPane().setLayout(new FlowLayout());
// Create the label that will display the target
// web site.
jlab = new JLabel("Transfer to " + primary);
// Create a check box.
jcbPrimary = new JCheckBox("Use Primary Site", true);
// Handle check box item events.
jcbPrimary.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent ie) {
// Toggle between primary and secondary sites.
if (jcbPrimary.isSelected()) {
jlab.setText("Transfer to " + primary);
} else {
jlab.setText("Transfer to " + secondary);
}
}
});
// Add a button that transfers to selected web site.
JButton jbtnJump = new JButton("Show Page Now");
// Create the action listener for the button.
jbtnJump.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
showStatus("Transferring to selected site.");
// Transfer to the desired site.
try {
if (jcbPrimary.isSelected()) {
getAppletContext().showDocument(
new URL("http://www."; + primary));
} else {
getAppletContext().showDocument(
new URL("http://www."; + secondary));
}
} catch (MalformedURLException exc) {
showStatus("Error in URL.");
}
}
});
// Add the label, check boxes, and button to the
// applet's content pane.
add(jcbPrimary);
add(jlab);
add(jbtnJump);
// Note: If you are using a version of Java prior to
// JDK 5, then you will need to use getContentPane()
// to explicitly add compponents to the content pane,
// as shown here.
//
// getContentPane().add(jcbPrimary);
//
// and so on.
}
// TODO overwrite start(), stop() and destroy() methods
}
Enjoy!
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