Java tutorial
/* * This file is part of Technic Launcher Core. * Copyright (C) 2013 Syndicate, LLC * * Technic Launcher Core is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Technic Launcher Core is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License, * as well as a copy of the GNU Lesser General Public License, * along with Technic Launcher Core. If not, see <http://www.gnu.org/licenses/>. */ package net.technicpack.autoupdate; import net.technicpack.autoupdate.io.StreamVersion; import net.technicpack.launchercore.install.LauncherDirectories; import net.technicpack.launchercore.mirror.download.Download; import net.technicpack.launchercore.util.DownloadListener; import net.technicpack.rest.RestfulAPIException; import net.technicpack.utilslib.OperatingSystem; import net.technicpack.utilslib.Utils; import org.apache.commons.io.IOUtils; import javax.swing.*; import java.io.*; import java.net.MalformedURLException; import java.net.URL; import java.net.URLDecoder; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.logging.Level; public class Relauncher { private IUpdateStream updateStream; public Relauncher(IUpdateStream updateStream) { this.updateStream = updateStream; } public String getUpdateUrl(String stream, int currentBuild, Class mainClass) { try { StreamVersion version = updateStream.getStreamVersion(stream); if (version.getBuild() == currentBuild) return null; String runningPath = getRunningPath(mainClass); if (runningPath.endsWith(".exe")) return version.getExeUrl(); else return version.getJarUrl(); } catch (RestfulAPIException ex) { return null; } catch (UnsupportedEncodingException ex) { return null; } } public void launch(String launchPath, Class mainClass, String[] args) { if (launchPath == null) { try { launchPath = getRunningPath(mainClass); } catch (UnsupportedEncodingException ex) { return; } } ProcessBuilder processBuilder = new ProcessBuilder(); ArrayList<String> commands = new ArrayList<String>(); if (!launchPath.endsWith(".exe")) { if (OperatingSystem.getOperatingSystem().equals(OperatingSystem.WINDOWS)) commands.add("javaw"); else commands.add("java"); commands.add("-Xmx256m"); commands.add("-Djava.net.preferIPv4Stack=true"); commands.add("-Dawt.useSystemAAFontSettings=lcd"); commands.add("-Dswing.aatext=true"); commands.add("-cp"); commands.add(launchPath); commands.add(mainClass.getName()); } else commands.add(launchPath); commands.addAll(Arrays.asList(args)); String command = ""; for (String token : commands) { command += token + " "; } Utils.getLogger().info("Launching command: '" + command + "'"); processBuilder.command(commands); try { processBuilder.start(); } catch (IOException ex) { JOptionPane.showMessageDialog(null, "Your OS has prevented this relaunch from completing. You may need to add an exception in your security software.", "Relaunch Failed", JOptionPane.ERROR_MESSAGE); ex.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } System.exit(0); } public String[] buildMoverArgs(Class mainClass, String[] args) throws UnsupportedEncodingException { List<String> outArgs = new ArrayList<String>(); outArgs.add("-movetarget"); outArgs.add(getRunningPath(mainClass)); outArgs.add("-mover"); outArgs.addAll(Arrays.asList(args)); return outArgs.toArray(new String[outArgs.size()]); } public String[] buildLauncherArgs(String[] args) { List<String> outArgs = new ArrayList<String>(); outArgs.add("-launcher"); outArgs.addAll(Arrays.asList(args)); return outArgs.toArray(new String[outArgs.size()]); } public String getRunningPath(Class mainClass) throws UnsupportedEncodingException { return URLDecoder.decode(mainClass.getProtectionDomain().getCodeSource().getLocation().getPath(), "UTF-8"); } public void replacePackage(Class mainClass, String targetPath) throws UnsupportedEncodingException { String currentPath = getRunningPath(mainClass); Utils.getLogger().log(Level.INFO, "Moving running package from " + currentPath + " to " + targetPath); File source = new File(currentPath); File dest = new File(targetPath); if (dest.exists()) { if (!dest.delete()) Utils.getLogger().log(Level.SEVERE, "Deletion of existing package failed!"); } FileInputStream sourceStream = null; FileOutputStream destStream = null; try { sourceStream = new FileInputStream(source); destStream = new FileOutputStream(dest); IOUtils.copy(sourceStream, destStream); } catch (IOException ex) { Utils.getLogger().log(Level.SEVERE, "Error attempting to copy download package:", ex); } finally { IOUtils.closeQuietly(sourceStream); IOUtils.closeQuietly(destStream); } dest.setExecutable(true, true); } public String downloadUpdate(String url, LauncherDirectories directories, String progressText, DownloadListener listener) { File dest; if (url.endsWith(".exe")) dest = new File(directories.getLauncherDirectory(), "temp.exe"); else dest = new File(directories.getLauncherDirectory(), "temp.jar"); try { Utils.getLogger().info("Downloading update from " + url + " to " + dest.getAbsolutePath()); Download download = new Download(new URL(url), progressText, dest.getPath()); download.setListener(listener); download.run(); if (download.getResult() != Download.Result.SUCCESS) { if (download.getException() != null) download.getException().printStackTrace(); return null; } } catch (MalformedURLException ex) { Utils.getLogger().log(Level.SEVERE, "Received bad url from build stream: " + url, ex); } return dest.getAbsolutePath(); } }