JAVA自动更新程序
import javax.swing.*; import java.awt.*; import java.net.*; import java.io.*; public class CheckUpdate extends JFrame { JFrame c = this; public CheckUpdate() { //设置窗体属性 setAttb(); JLabel title = new JLabel("正在检查网络上的更新资源"); this.add(title, BorderLayout.NORTH); JTextArea msg = new JTextArea(); this.add(msg, BorderLayout.CENTER); JLabel process = new JLabel(); this.add(process, BorderLayout.SOUTH); //启动更新线程 new Check(msg, process).start(); } private class Check extends Thread { //标识,是否存在新的更新文件 private boolean isUpdated = false; //保存最新的版本 String netVersion; //本地版本文件名 String LocalVerFileName = "ver.txt"; //显示信息 private JTextArea msg; private JLabel process; public Check(JTextArea msg, JLabel process) { this.msg = msg; this.process = process; } public void run() { //更新文件版本标识URL String versionUrl = "http://XXX.XXX.XXX/AutoUpdate/ver"; /**//* 这里是通过HTTP访问一个页面,以取得网络上的版本号 比如这里就是在这个页面直接打印出 6.19.1.1 然后把这个版本号比对本地的版本号,如果版本号不同的话,就从网络上下载新的程序并覆盖现有程序 */ URL url = null; InputStream is = null; InputStreamReader isr = null; BufferedReader netVer = null; //读取网络上的版本号 try { url = new URL(versionUrl); is = url.openStream(); isr = new InputStreamReader(is); netVer = new BufferedReader(isr); String netVerStr = netVer.readLine(); String localVerStr = getNowVer(); if (netVerStr.equals(localVerStr)) { msg.append("当前文件是最新版本\n"); isUpdated = false; } else { msg.append("存在更新文件,现在开始更新\n"); isUpdated = true; netVersion = netVerStr; } } catch (MalformedURLException ex) { } catch (IOException ex) { } finally { //释放资源 try { netVer.close(); isr.close(); is.close(); } catch (IOException ex1) { } } //如果版本不同,下载网络上的文件,更新本地文件 if (isUpdated) { //本地需要被更新的文件 File oldFile = new File("client.exe"); //缓存网络上下载的文件 File newFile = new File("temp.exe"); //网络上的文件位置 String updateUrl = "http://XXX.XXX.XXX/downloads/simpkle.exe"; HttpURLConnection httpUrl = null; BufferedInputStream bis = null; FileOutputStream fos = null; try { //打开URL通道 url = new URL(updateUrl); httpUrl = (HttpURLConnection) url.openConnection(); httpUrl.connect(); byte[] buffer = new byte[1024]; int size = 0; is = httpUrl.getInputStream(); bis = new BufferedInputStream(is); fos = new FileOutputStream(newFile); msg.append("正在从网络上下载新的更新文件\n"); //保存文件 try { int flag = 0; int flag2 = 0; while ((size = bis.read(buffer)) != -1) { //读取并刷新临时保存文件 fos.write(buffer, 0, size); fos.flush(); //模拟一个简单的进度条 if (flag2 == 99) { flag2 = 0; process.setText(process.getText() + "."); } flag2++; flag++; if (flag > 99 * 50) { flag = 0; process.setText(""); } } } catch (Exception ex4) { System.out.println(ex4.getMessage()); } msg.append("\n文件下载完成\n"); //把下载的临时文件替换原有文件 CopyFile(oldFile,newFile); //把本地版本文件更新为网络同步 UpdateLocalVerFile(); } catch (MalformedURLException ex2) { } catch (IOException ex) { msg.append("文件读取错误\n"); } finally { try { fos.close(); bis.close(); is.close(); httpUrl.disconnect(); } catch (IOException ex3) { } } } //启动应用程序 try { msg.append("启动应用程序"); Thread.sleep(500); Process p = Runtime.getRuntime().exec("client.exe"); } catch (IOException ex5) { } catch (InterruptedException ex) { } //退出更新程序 System.exit(0); } //复制文件 private void CopyFile(File oldFile, File newFile) { FileInputStream in = null; FileOutputStream out = null; try { if(oldFile.exists()){ oldFile.delete(); } in = new FileInputStream(newFile); out = new FileOutputStream(oldFile); byte[] buffer = new byte[1024 * 5]; int size; while ((size = in.read(buffer)) != -1) { out.write(buffer, 0, size); out.flush(); } } catch (FileNotFoundException ex) { } catch (IOException ex) { } finally { try { out.close(); in.close(); } catch (IOException ex1) { } } } private void UpdateLocalVerFile() { //把本地版本文件更新为网络同步 FileWriter verOS = null; BufferedWriter bw = null; try { verOS = new FileWriter(LocalVerFileName); bw = new BufferedWriter(verOS); bw.write(netVersion); bw.flush(); } catch (IOException ex) { } finally { try { bw.close(); verOS.close(); } catch (IOException ex1) { } } } private String getNowVer() { //本地版本文件 File verFile = new File(LocalVerFileName); FileReader is = null; BufferedReader br = null; //读取本地版本 try { is = new FileReader(verFile); br = new BufferedReader(is); String ver = br.readLine(); return ver; } catch (FileNotFoundException ex) { msg.append("本地版本文件未找到\n"); } catch (IOException ex) { msg.append("本地版本文件读取错误\n"); } finally { //释放资源 try { br.close(); is.close(); } catch (IOException ex1) { } } return ""; } } private void setAttb() { //窗体设置 this.setTitle("Auto Update"); this.setSize(200, 150); this.setLayout(new BorderLayout()); this.setDefaultCloseOperation(EXIT_ON_CLOSE); // 窗体居中 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize = this.getSize(); if (frameSize.height > screenSize.height) { frameSize.height = screenSize.height; } if (frameSize.width > screenSize.width) { frameSize.width = screenSize.width; } this.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2); } public static void main(String[] args) { CheckUpdate checkupdate = new CheckUpdate(); checkupdate.setVisible(true); } }查看完整版本： JAVA自动更新程序
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