applet.java

The Javatm Telnet Application/Applet 很好用的

        try {
          clipboard = appletFrame.getContentPane().getToolkit().getSystemClipboard();
          System.err.println("Applet: acquired system clipboard: " + clipboard);
        } catch (Exception e) {
          System.err.println("Applet: system clipboard access denied: " +
                             ((e instanceof InvocationTargetException) ?
                              ((InvocationTargetException) e).getTargetException() : e));
          // e.printStackTrace();
        } finally {
          if (clipboard == null) {
            System.err.println("Applet: copy & paste only within the JTA");
            clipboard = new Clipboard("de.mud.jta.Main");
          }
        }

        if ((new Boolean(options.getProperty("Applet.detach.immediately"))
                .booleanValue())) {
          if ((new Boolean(options.getProperty("Applet.detach.fullscreen"))
                  .booleanValue()))
            ((JFrame) appletFrame)
                    .setSize(appletFrame.getContentPane().getToolkit().getScreenSize());
          else
            ((JFrame) appletFrame).pack();

          ((JFrame) appletFrame).show();
          pluginLoader.broadcast(new SocketRequest(host, Integer.parseInt(port)));
          pluginLoader.broadcast(new ReturnFocusRequest());
          close.setLabel(startText != null ? stopText : "Disconnect");
        } else
          close.setLabel(startText != null ? startText : "Connect");

        close.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            if (((JFrame) appletFrame).isVisible()) {
              pluginLoader.broadcast(new SocketRequest());
              ((JFrame) appletFrame).setVisible(false);
              close.setLabel(startText != null ? startText : "Connect");
            } else {
              if (frameTitle == null)
                ((JFrame) appletFrame)
                        .setTitle("jta: " + host + (port.equals("23")?"":" " + port));
              if ((new Boolean(options.getProperty("Applet.detach.fullscreen"))
                      .booleanValue()))
                ((JFrame) appletFrame)
                        .setSize(appletFrame.getContentPane().getToolkit().getScreenSize());
              else
                ((JFrame) appletFrame).pack();
              ((JFrame) appletFrame).show();
              if (port == null || port.length() <= 0)
		port = "23";
              getAppletContext().showStatus("Trying " + host + " " + port + " ...");
              pluginLoader.broadcast(new SocketRequest(host,
                                                       Integer.parseInt(port)));
              pluginLoader.broadcast(new ReturnFocusRequest());
              close.setLabel(stopText != null ? stopText : "Disconnect");
            }
          }
        });

        getContentPane().setLayout(new BorderLayout());
        getContentPane().add("Center", close);

        // add a menu bar
        MenuBar mb = new MenuBar();
        Menu file = new Menu("File");
        file.setShortcut(new MenuShortcut(KeyEvent.VK_F, true));
        MenuItem tmp;
        file.add(tmp = new MenuItem("Connect"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            pluginLoader.broadcast(new SocketRequest(host,
                                                     Integer.parseInt(port)));
          }
        });
        file.add(tmp = new MenuItem("Disconnect"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            pluginLoader.broadcast(new SocketRequest());
          }
        });
        file.add(new MenuItem("-"));
        file.add(tmp = new MenuItem("Print"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            if (pluginLoader.getComponents().get("Terminal") != null) {
              PrintJob printJob =
                      appletFrame.getContentPane().getToolkit()
                      .getPrintJob((JFrame) appletFrame, "JTA Terminal", null);
              ((Component) pluginLoader.getComponents().get("Terminal"))
                      .print(printJob.getGraphics());
              printJob.end();
            }
          }
        });
        file.add(new MenuItem("-"));
        file.add(tmp = new MenuItem("Exit"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            ((JFrame) appletFrame).setVisible(false);
            pluginLoader.broadcast(new SocketRequest());
            close.setLabel(startText != null ? startText : "Connect");
          }
        });
        mb.add(file);

        Menu edit = new Menu("Edit");
        edit.setShortcut(new MenuShortcut(KeyEvent.VK_E, true));
        edit.add(tmp = new MenuItem("Copy"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            if (debug > 2)
              System.err.println("Applet: copy: " + focussedPlugin);
            if (focussedPlugin instanceof VisualTransferPlugin)
              ((VisualTransferPlugin) focussedPlugin).copy(clipboard);
          }
        });
        edit.add(tmp = new MenuItem("Paste"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            if (debug > 2)
              System.err.println("Applet: paste: " + focussedPlugin);
            if (focussedPlugin instanceof VisualTransferPlugin)
              ((VisualTransferPlugin) focussedPlugin).paste(clipboard);
          }
        });
        mb.add(edit);

        Map menuList = pluginLoader.getMenus();
        names = menuList.keySet().iterator();
        while (names.hasNext()) {
          String name = (String) names.next();
	  Object o = menuList.get(name);
          if (o instanceof Menu) mb.add((Menu) o);
        }

        Menu help = new Menu("Help");
        help.setShortcut(new MenuShortcut(KeyEvent.VK_HELP, true));
        help.add(tmp = new MenuItem("General"));
        tmp.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
            Help.show(appletFrame.getContentPane(), options.getProperty("Help.url"));
          }
        });
        mb.setHelpMenu(help);

        // only add the menubar if the property is true
        if ((new Boolean(options.getProperty("Applet.detach.menuBar"))
                .booleanValue()))
          ((JFrame) appletFrame).setMenuBar(mb);

        // add window closing event handler
        try {
          ((JFrame) appletFrame).addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent evt) {
              pluginLoader.broadcast(new SocketRequest());
              ((JFrame) appletFrame).setVisible(false);
              close.setLabel(startText != null ? startText : "Connect");
            }
          });
        } catch (Exception e) {
          System.err.println("Applet: could not set up Window event listener");
          System.err.println("Applet: you will not be able to close it");
        }

        pluginLoader.registerPluginListener(new OnlineStatusListener() {
          public void online() {
            if (debug > 0) System.err.println("Terminal: online");
            online = true;
            if (((JFrame) appletFrame).isVisible() == false)
              ((JFrame) appletFrame).setVisible(true);
          }

          public void offline() {
            if (debug > 0) System.err.println("Terminal: offline");
            online = false;
            if (disconnectCloseWindow) {
              ((JFrame) appletFrame).setVisible(false);
              close.setLabel(startText != null ? startText : "Connect");
            }
          }
        });

        // register a focus status listener, so we know when a plugin got focus
        pluginLoader.registerPluginListener(new FocusStatusListener() {
          public void pluginGainedFocus(Plugin plugin) {
            if (Applet.debug > 0)
              System.err.println("Applet: " + plugin + " got focus");
            focussedPlugin = plugin;
          }

          public void pluginLostFocus(Plugin plugin) {
            // we ignore the lost focus
            if (Applet.debug > 0)
              System.err.println("Applet: " + plugin + " lost focus");
          }
        });

      } else
      // if we have no external frame use this online status listener
        pluginLoader.registerPluginListener(new OnlineStatusListener() {
          public void online() {
            if (debug > 0) System.err.println("Terminal: online");
            online = true;
          }

          public void offline() {
            if (debug > 0) System.err.println("Terminal: offline");
            online = false;
          }
        });


    }
  }

  /**
   * Start the applet. Connect to the remote host.
   */
  public void start() {
    if (!online && (appletFrame == this || connect)) {
      if (debug > 0) System.err.println("start(" + host + ", " + port + ")");
      getAppletContext().showStatus("Trying " + host + " " + port + " ...");
      pluginLoader.broadcast(new SocketRequest(host, Integer.parseInt(port)));
      pluginLoader.broadcast(new ReturnFocusRequest());
    }
  }

  /**
   * Stop the applet and disconnect.
   */
  public void stop() {
    if (online && disconnect) {
      if (debug > 0) System.err.println("stop()");
      pluginLoader.broadcast(new SocketRequest());
    }
  }

  /**
   * Override any properties that are found in the configuration files
   * with possible values found as applet parameters.
   * @param options the loaded configuration file properties
   */
  private void parameterOverride(Properties options) {
    Enumeration e = options.keys();
    while (e.hasMoreElements()) {
      String key = (String) e.nextElement(), value = getParameter(key);
      if (value != null) {
        System.out.println("Applet: overriding value of " + key + " with " + value);
        // options.setProperty(key, value);
        options.put(key, value);
      }
    }
  }
}