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);
}
}
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
步骤阅读
幂知科技
杭州格原