通过编程删除文件
您可以通过管理控制台、wsadmin 工具或编程,将文件从现有的应用程序删除。使用此示例,通过编程来删除文件。
开始之前
您必须首先在 WebSphere® Application Server 上安装了应用程序,才能将文件从该应用程序中删除。
关于此任务
执行以下各项任务,从而通过编程来删除文件。
过程
- 连接到 WebSphere Application Server。
- 创建应用程序管理代理。
- 创建用于侦听事件的通知过滤器。
- 添加侦听器。
- 从应用程序中删除文件。
- 如果超时请等待,以使程序不会结束。
- 侦听 Java 管理扩展 (JMX) 通知,以了解操作的完成情况。
- 当文件从应用程序中删除时,移除侦听器,然后退出。
结果
示例
以下示例显示如何根据上述步骤删除文件。为了打印方便,某些语句被拆分为几行。
//Inputs:
//fileURI specifies a URI that gives the target location of the file. The URI
// provides the location of the new module after installation. The URI is
// relative to the application URL.
//appName specifies the name of the application.
String fileURI = "Increment.jar/com/acme/Foo.class";
String appName = "MyApp";
//Get the administrative client to connect to
//WebSphere Application Server.
AdminClient client = ...;
//Create the application management proxy.
AppManagement proxy = AppManagementProxy. getJMXProxyForClient (client);
//Create the notification filter.
NotificationFilterSupport myFilter = new NotificationFilterSupport();
myFilter.enableType (NotificationConstants.TYPE_APPMANAGEMENT);
//Add the listener.
NotificationListener listener = new AListener(_soapClient, myFilter,
"Install: " + appName, AppNotification.UPDATE);
//Update the existing application, MyApp, by deleting the file.
Hashtable options = new Hashtable();
options.put (AppConstants.APPDEPL_LOCALE, Locale.getDefault());
options.put (AppConstants.APPUPDATE_CONTENTTYPE, AppConstants.APPUPDATE_CONTENT_FILE);
proxy.updateApplication ( appName,
fileURI,
null,
AppConstants.APPUPDATE_DELETE,
options,
null);
// Wait for some timeout. The installation Application Programming Interface (API) is
// asynchronous and so returns immediately.
// If the program does not wait here, the program ends.
Thread.sleep(300000); // Wait so that the program does not end.
}
catch (Exception e) {
e.printStackTrace();
}
}
}
// Specify the Java Management Extensions (JMX) notification listener for JMX events.
class AListener implements NotificationListener
{
AdminClient _soapClient;
NotificationFilterSupport myFilter;
Object handback;
ObjectName on;
String eventTypeToCheck;
public AListener(AdminClient cl, NotificationFilterSupport fl,
Object h, String eType) throws Exception
{
_soapClient = cl;
myFilter = fl;
handback = h;
eventTypeToCheck = eType;
Iterator iter = _soapClient.queryNames (new ObjectName(
"WebSphere:type=AppManagement,*"), null).iterator();
on = (ObjectName)iter.next();
System.out.println ("ObjectName: " + on);
_soapClient.addNotificationListener (on, this, myFilter, handback);
}
public void handleNotification (Notification notf, Object handback)
{
AppNotification ev = (AppNotification) notf.getUserData();
System.out.println ("!! JMX event Recd: (handback obj= " + handback+ "): " + ev);
//Once the installation is done, remove the listener and quit
if (ev.taskName.equals (eventTypeToCheck) &&
(ev.taskStatus.equals (AppNotification.STATUS_COMPLETED) ||
ev.taskStatus.equals (AppNotification.STATUS_FAILED)))
{
try
{
_soapClient.removeNotificationListener (on, this);
}
catch (Throwable th)
{
System.out.println ("Error removing listener: " + th);
}
System.exit (0);
}
}
}