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Use AppletContext to Display a Web Page
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Classes and Interfaces javaappletApplet javaappletAppletContext Methods AppletContext getAppletContext( ) showDocument(URL url)
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This recipe shows how to use an applet to display a Web page You might use such an applet to let the user choose between various options, and then display the page that he or she selected To do this, you will obtain the applet s AppletContext and then use its showDocument( ) method to display the page
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To display a Web page from an applet, follow these steps: 1 Obtain a reference to the AppletContext associated with the applet by calling getAppletContext( ) 2 Construct a URL object that represents the desired page 3 Using the AppletContext, call showDocument( ), specifying the URL
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To obtain the AppletContext for an applet, call getAppletContext( ) shown here: AppletContext getAppletContext( ) It returns a reference to the AppletContext associated with the invoking applet As explained in Applet Overview, AppletContext encapsulates information about the applet s execution environment Construct a URL instance that describes the page that you want to display URL defines several constructors The one used here is URL(String url) throws MalformedURLException Here url must specify a valid URL, including protocol If it doesn t, a MalformedURLException is thrown To display the page, call showDocument( ), shown here, on the AppletContext, passing in the desired URL: void showDocument(URL url) Here, url specifies the page to display
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Example
The following example shows how to display a Web page from an applet It allows the user to choose between two Web sites, both of which are passed in as parameters (See the
6:
Applets and Servlets
preceding recipe for information on passing parameters to applets) To display the page, the user must press the Show Page Now button This causes showDocument( ) to be invoked, which results in the browser navigating to the specified page One other point: Notice that it uses showStatus( ), which is defined by Applet, to output an error message to the browser s status window if the URL is in error The status window can be a useful place to display feedback to the user However, its behavior may differ between browsers
NOTE This example must be run inside a browser that is currently online and not by
appletviewer
// // // // // // // // A Swing-based applet that uses the showDocument() method defined by AppletContext to display 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 javaxswing*; javaawt*; javaawtevent*; javanet*;
import import import import
/* <applet code="ShowURL" width=220 height=100> <param name=primarySite value=HerbSchildtcom> <param name=secondarySite value=McGrawHillcom> <param name=default value=0> </applet> */ public class ShowURL extends JApplet { JLabel jlab; JCheckBox jcbPrimary; String primary; String secondary; // Initialize the applet public void init() { primary = getParameter("primarySite"); secondary = getParameter("secondarySite"); try { SwingUtilitiesinvokeAndWait(new Runnable () { public void run() { makeGUI(); }
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}); } catch(Exception exc) { Systemoutprintln("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 jcbPrimaryaddItemListener(new ItemListener() { public void itemStateChanged(ItemEvent ie) { // Toggle between primary and secondary sites if(jcbPrimaryisSelected()) jlabsetText("Transfer to " + primary); else jlabsetText("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 jbtnJumpaddActionListener( new ActionListener() { public void actionPerformed(ActionEvent ae) { showStatus("Transferring to selected site"); // Transfer to the desired site try { if(jcbPrimaryisSelected()) getAppletContext()showDocument( new URL("http://www" + primary));
6:
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