Applet Security Example: <APPLET> tag

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This applet that tries to access the secure property "user.name":

This browser does not support the <APPLET> tag. Use Choose Browser to select your browser.

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This applet accesses a JAR files which has been signed with a Netscape Object Signing certificate. The Java source code has also been modified to access the Netscape Capabilities API prior to access the secure property.

import java.awt.Graphics;
import java.applet.Applet;

public class SecurityApplet extends Applet {

    public void init() {}

    public void paint(Graphics g) {

        String privilege = "UniversalPropertyRead";
        
        try {
        
            netscape.security.PrivilegeManager.enablePrivilege(privilege);
            
            String thePropParam = getParameter("prop");
            String theProperty = System.getProperty(thePropParam);
            
            g.drawString("Successfully got \"" + thePropParam + "\" property: " + theProperty, 10, 10);
            
        } catch (SecurityException se) {
            g.drawString("SecurityApplet caught SecurityException: " + se.getMessage(), 10, 10);
        } catch (Exception e) {
            g.drawString("Netscape privilege not granted: " + privilege, 10, 10);

        }

        
    }

}