Posted on 2008-09-01 16:17
沙漠中的魚 閱讀(4299)
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Java
最近由于一個(gè)工程需要做應(yīng)用程序啟動(dòng)時(shí),自動(dòng)更新的項(xiàng)目
在GOOGLE上找了半天也沒見到什么比較好的辦法
自己動(dòng)手寫了一個(gè)通過版本號(hào)檢查網(wǎng)絡(luò)上是不是存在新的更新文件,并自動(dòng)通過HTTP下載文件的程序
希望對(duì)正在找此類程序的朋友有幫助
本地文件需要一個(gè)ver.txt 此文件內(nèi)容為本地軟件版本號(hào)
網(wǎng)絡(luò)上我直接在一個(gè)頁面上打印出網(wǎng)絡(luò)存在的版本號(hào)
例如,這個(gè)例子里,我在 http://XXX.XXX.XXX/AutoUpdate/ver 這里直接打印出版本號(hào)
源文件:http://211.136.109.100/beiouwolf/AutoUpdate.rar
import javax.swing.*;
import java.awt.*;
import java.net.*;
import java.io.*;
public class CheckUpdate extends JFrame 
{
JFrame c = this;
public CheckUpdate() {
//設(shè)置窗體屬性
setAttb();
JLabel title = new JLabel("正在檢查網(wǎng)絡(luò)上的更新資源");
this.add(title, BorderLayout.NORTH);
JTextArea msg = new JTextArea();
this.add(msg, BorderLayout.CENTER);
JLabel process = new JLabel();
this.add(process, BorderLayout.SOUTH);
//啟動(dòng)更新線程
new Check(msg, process).start();
}
private class Check extends Thread {
//標(biāo)識(shí),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";
//顯示信息
private JTextArea msg;
private JLabel process;
public Check(JTextArea msg, JLabel process) {
this.msg = msg;
this.process = process;
}
public void run() {
//更新文件版本標(biāo)識(shí)URL
String versionUrl = "http://XXX.XXX.XXX/AutoUpdate/ver";
/**//*
這里是通過HTTP訪問一個(gè)頁面,以取得網(wǎng)絡(luò)上的版本號(hào)
比如這里就是在這個(gè)頁面直接打印出 6.19.1.1
然后把這個(gè)版本號(hào)比對(duì)本地的版本號(hào),如果版本號(hào)不同的話,就從網(wǎng)絡(luò)上下載新的程序并覆蓋現(xiàn)有程序
*/
URL url = null;
InputStream is = null;
InputStreamReader isr = null;
BufferedReader netVer = null;
//讀取網(wǎng)絡(luò)上的版本號(hào)
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("當(dāng)前文件是最新版本\n");
isUpdated = false;
} else {
msg.append("存在更新文件,現(xiàn)在開始更新\n");
isUpdated = true;
netVersion = netVerStr;
}
} catch (MalformedURLException ex) {
} catch (IOException ex) {
} finally {
//釋放資源
try {
netVer.close();
isr.close();
is.close();
} catch (IOException ex1) {
}
}
//如果版本不同,下載網(wǎng)絡(luò)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");
//緩存網(wǎng)絡(luò)上下載的文件
File newFile = new File("temp.exe");
//網(wǎng)絡(luò)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 {
//打開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("正在從網(wǎng)絡(luò)上下載新的更新文件\n");
//保存文件
try {
int flag = 0;
int flag2 = 0;
while ((size = bis.read(buffer)) != -1) {
//讀取并刷新臨時(shí)保存文件
fos.write(buffer, 0, size);
fos.flush();
//模擬一個(gè)簡單的進(jìn)度條
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文件下載完成\n");
//把下載的臨時(shí)文件替換原有文件
CopyFile(oldFile,newFile);
//把本地版本文件更新為網(wǎng)絡(luò)同步
UpdateLocalVerFile();
} catch (MalformedURLException ex2) {
} catch (IOException ex) {
msg.append("文件讀取錯(cuò)誤\n");
} finally {
try {
fos.close();
bis.close();
is.close();
httpUrl.disconnect();
} catch (IOException ex3) {
}
}
}
//啟動(dòng)應(yīng)用程序
try {
msg.append("啟動(dòng)應(yīng)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);
}
//復(fù)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為網(wǎng)絡(luò)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;
//讀取本地版本
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("本地版本文件讀取錯(cuò)誤\n");
} finally {
//釋放資源
try {
br.close();
is.close();
} catch (IOException ex1) {
}
}
return "";
}
}
private void setAttb() {
//窗體設(shè)置
this.setTitle("Auto Update");
this.setSize(200, 150);
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
// 窗體居中
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);
}
}
轉(zhuǎn)載:http://blog.csdn.net/beiouwolf/archive/2006/09/23/1268291.aspx