package com.marinilli.b2.c7.installerapplet; import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; import java.io.*; import java.net.*; import java.util.*; /** * Chapter 7 - The installer applet * * @author Mauro Marinilli * @version 1.0 */ public class InstallerApplet extends JApplet { boolean isStandalone = false; JLabel titleLabel = new JLabel(); JTextArea messagesArea = new JTextArea(); /**Get a parameter value*/ public String getParameter(String key) { if (isStandalone) return System.getProperty(key); return super.getParameter(key); } /**Construct the applet*/ public InstallerApplet() { } /**Initialize the applet*/ public void init() { titleLabel.setText(""+ ""+getParameter("appname")+ " Installation Applet"); setSize(new Dimension(512,300)); messagesArea.setForeground(Color.blue); messagesArea.setEditable(false); messagesArea.setText("Installation started..\n"); getContentPane().add(titleLabel, BorderLayout.NORTH); getContentPane().add(new JScrollPane(messagesArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED), BorderLayout.CENTER); } /**Start the applet*/ public void start() { int choice = JOptionPane.showConfirmDialog(this, "This will Install "+ getParameter("appname")+ " on your computer", "Continue with Installation?", JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE); if (choice == JOptionPane.OK_OPTION) { copy(); } else { printMessage("User decided to abort installation."); printMessage("To restart the installation visit again this page."); } } /**Stop the applet*/ public void stop() { } /**Destroy the applet*/ public void destroy() { } /** * copies specified files on the specified local destination */ public void copy(){ String[] resources = getItems( getParameter("resources") ); String destDir = getParameter("destination"); if (resources==null || destDir==null) { printMessage("Invalid Parameter Settings.\n Installation aborted."); return; } BufferedInputStream in = null; URL serverURL; byte[] buffer; try { for (int i = 0; i < resources.length; i++) { serverURL = new URL(getCodeBase(), resources[i]); URLConnection conn = serverURL.openConnection(); in = new BufferedInputStream(conn.getInputStream()); String res = destDir+System.getProperty("file.separator")+resources[i]; new File(new File(res).getParent()).mkdirs(); FileOutputStream out = new FileOutputStream(res); printMessage(" - copying from:"+serverURL+" to:"+res); buffer = new byte[2048]; int j; while((j = in.read(buffer)) != -1) out.write(buffer, 0, j); }//for printMessage("Installation finished."); } catch (Exception ex) { printMessage("copy: "+ex); printMessage("Installation aborted."); } finally { try { if(in != null) in.close(); } catch (Exception ex) { printMessage("copy() closing InputStream "+ex); } } } /** * overwritten for application support */ public URL getCodeBase() { try { if (isStandalone) return new File(".").toURL(); } catch (MalformedURLException mue) { System.out.println("getCodebase() "+mue); } return super.getCodeBase(); } /** * tokenize a string */ private String[] getItems(String s){ if (s==null) return null; ArrayList result = new ArrayList(); StringTokenizer st = new StringTokenizer(s,";:,"); while (st.hasMoreTokens()) { String w = st.nextToken(); result.add(w); } String[] a = new String[result.size()]; result.toArray(a); return a; } /** * writes on the applet's message area */ private void printMessage(String msg){ messagesArea.append(msg+"\n"); } /** * main method */ static public void main(String[] args) { System.getProperties().put("resources","setup\\res\\a.jar"); System.getProperties().put("destination","c:\\appzz"); System.getProperties().put("appname","MegaAppz 1.0"); InstallerApplet a = new InstallerApplet(); a.isStandalone = true; JFrame f = new JFrame("Test Frame"); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); a.init(); f.getContentPane().add(a); f.setSize(400,300); f.setVisible(true); a.start(); } }