swt结合httpclient实现自动更新 [autoupdate in swt with httpclient]
/**
* 本地程序应当自知版本号已与更新站点相比较,
* plugin的版本号是在plugin.xml里面设置的,导出的jar包会依据此版本号命名，
* 而eclipse会自动依据此版本信息选择加载最新版本
* 此程序的测试：不能直接在eclipse里面运行，应将此rcp打包，然后将version改大，又打个plugin包,将plugin包放在站点上
* 启动原来的rcp程序则会出现下载重启动作
* @date Nov 4, 2008
* @see
*/
public class AutoUpdate
{
private Display display;
private Shell shell;
private boolean needReload;
private String version = "1.0.0";
public AutoUpdate()
{
display = new Display();
shell = new Shell(display);
shell.setText(version);
shell.setSize(500, 200);
}
private byte[] httpGetRequest(String url)
{
HttpClient httpClient = new HttpClient();
GetMethod getMethod = new GetMethod(url);
try
{
int statusCode = httpClient.executeMethod(getMethod);
if (statusCode != HttpStatus.SC_OK)
{
System.err.println("Method failed: " + getMethod.getStatusLine());
return null;
}
byte[] responseBody = getMethod.getResponseBody();
return responseBody;
}
catch (HttpException e)
{
e.printStackTrace();
return null;
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
finally
{
getMethod.releaseConnection();
}
}
public void checkAndDown()
{
try
{
byte[] responseBody = httpGetRequest("http://localhost:10010/SmileScriptWeb/autoupdate_config.xml");
if (null == responseBody)
{
System.err.println("can't get config.");
return;
}
String strXml = new String(responseBody);
System.out.println(strXml);
Document doc = DocumentHelper.parseText(strXml);
Element el = doc.getRootElement().element("update");
String sversion = el.attributeValue("version");
String fileName = el.attributeValue("filename");
String url = el.attributeValue("url");
int curversion = Integer.valueOf(version.replaceAll("\\.", "")).intValue();
int serverversion = Integer.valueOf(sversion.replaceAll("\\.", "")).intValue();
if (curversion < serverversion)
{
System.out.println("need download new version.");
}else{
return;
}
System.out.println("got config successfully: version=" + sversion);
// download
url = "http://localhost:10010/SmileScriptWeb/" + url;
responseBody = httpGetRequest(url);
if (null == responseBody)
{
System.err.println("can't download update.");
return;
}
fileName = getAppRootPath() + "plugins/" + fileName;
System.out.println("the download file full name=" + fileName);
File storeFile = new File(fileName);
FileOutputStream output = new FileOutputStream(storeFile);
output.write(responseBody);
output.close();
System.out.println("download successfully.");
needReload = true;
}
catch (DocumentException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
private static String installPath;
public static String getAppRootPath() {
if (null == installPath)
{
Location installLoc = Platform.getInstallLocation();
URL installURL = installLoc.getURL();
installPath = installURL.getPath();
}
return installPath;
}
public Object run()
{
final int totalColumn = 1 ;
GridLayout layout = new GridLayout(totalColumn,false);
shell.setLayout(layout);
checkAndDown();
if (needReload)
{
return IPlatformRunnable.EXIT_RESTART;
}
// shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
return IPlatformRunnable.EXIT_OK;
}
}
------------------------------------------------------------------------autoupdate_config.xml-------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<config>
<update version="1.0.1" filename="rcp_swt_1.0.1.jar" url="rcp_swt_1.0.1.jar" />
</config>
