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

此任务假设您对 MBean 编程有基本的了解。有关 MBean 编程的信息,请参阅 MBean Java™ 应用程序编程接口 (API) 文档。 在此信息中心中,单击引用 > MBean 接口

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

  1. 连接到 WebSphere Application Server
  2. 创建应用程序管理代理。
  3. 创建用于侦听事件的通知过滤器。
  4. 添加侦听器。
  5. 从应用程序中删除文件。
  6. 如果超时请等待,以使程序不会结束。
  7. 侦听 Java 管理扩展 (JMX) 通知,以了解操作的完成情况。
  8. 当文件从应用程序中删除时,移除侦听器,然后退出。

结果

成功运行代码之后,文件就从应用程序中删除了。

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);
        }
    }
}

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