Example: 示例：连接识别客户机
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< Zh | Documentation
以下示例说明了一个高级客户机，它可以获知远程桥的状态。准备工作 一章中给出了一个简单客户机的完整示例。
下面的 Java 示例打开一个 awt 小窗口，该窗口包含按钮新建 Writer 和新建 Calc ，用于打开一个新文档和一个状态标签。首次单击一个按钮时，该视窗链接到一个正在执行的办公软件。因此，它使用连接器/桥工厂组合，并将自己作为一个事件侦听器注册到进程间桥。
办公软件终止时，会终止处理事件，而且 Java 程序将状态标签中的文本设置为“已断开连接”并清除办公软件的桌面引用。下一次单击按钮时，程序就知道必须重新建立连接。
方法 getComponentLoader() 根据需要获取 XComponentLoader 引用：
XComponentLoader _officeComponentLoader = null;
// local component context
XComponentContext _ctx;
protected com.sun.star.frame.XComponentLoader getComponentLoader()
throws com.sun.star.uno.Exception {
XComponentLoader officeComponentLoader = _officeComponentLoader;
if (officeComponentLoader == null) {
// instantiate connector service
Object x = _ctx.getServiceManager().createInstanceWithContext(
"com.sun.star.connection.Connector", _ctx);
XConnector xConnector = (XConnector) UnoRuntime.queryInterface(XConnector.class, x);
// helper function to parse the UNO URL into a string array
String a[] = parseUnoUrl(_url);
if (null == a) {
throw new com.sun.star.uno.Exception("Couldn't parse UNO URL "+ _url);
}
// connect using the connection string part of the UNO URL only.
XConnection connection = xConnector.connect(a[0]);
x = _ctx.getServiceManager().createInstanceWithContext(
"com.sun.star.bridge.BridgeFactory", _ctx);
XBridgeFactory xBridgeFactory = (XBridgeFactory) UnoRuntime.queryInterface(
XBridgeFactory.class , x);
// create a nameless bridge with no instance provider
// using the middle part of the UNO URL
XBridge bridge = xBridgeFactory.createBridge("" , a[1] , connection , null);
// query for the XComponent interface and add this as event listener
XComponent xComponent = (XComponent) UnoRuntime.queryInterface(
XComponent.class, bridge);
xComponent.addEventListener(this);
// get the remote instance
x = bridge.getInstance(a[2]);
// Did the remote server export this object ?
if (null == x) {
throw new com.sun.star.uno.Exception(
"Server didn't provide an instance for" + a[2], null);
}
// Query the initial object for its main factory interface
XMultiComponentFactory xOfficeMultiComponentFactory = (XMultiComponentFactory)
UnoRuntime.queryInterface(XMultiComponentFactory.class, x);
// retrieve the component context (it's not yet exported from the office)
// Query for the XPropertySet interface.
XPropertySet xProperySet = (XPropertySet)
UnoRuntime.queryInterface(XPropertySet.class, xOfficeMultiComponentFactory);
// Get the default context from the office server.
Object oDefaultContext =
xProperySet.getPropertyValue("DefaultContext");
// Query for the interface XComponentContext.
XComponentContext xOfficeComponentContext =
(XComponentContext) UnoRuntime.queryInterface(
XComponentContext.class, oDefaultContext);
// now create the desktop service
// NOTE: use the office component context here !
Object oDesktop = xOfficeMultiComponentFactory.createInstanceWithContext(
"com.sun.star.frame.Desktop", xOfficeComponentContext);
officeComponentLoader = (XComponentLoader)
UnoRuntime.queryInterface( XComponentLoader.class, oDesktop);
if (officeComponentLoader == null) {
throw new com.sun.star.uno.Exception(
"Couldn't instantiate com.sun.star.frame.Desktop" , null);
}
_officeComponentLoader = officeComponentLoader;
}
return officeComponentLoader;
}
这是一个按钮事件处理程序：
public void actionPerformed(ActionEvent event) {
try {
String sUrl;
if (event.getSource() == _btnWriter) {
sUrl = "private:factory/swriter";
} else {
sUrl = "private:factory/scalc";
}
getComponentLoader().loadComponentFromURL(
sUrl, "_blank", 0,new com.sun.star.beans.PropertyValue[0]);
_txtLabel.setText("connected");
} catch (com.sun.star.connection.NoConnectException exc) {
_txtLabel.setText(exc.getMessage());
} catch (com.sun.star.uno.Exception exc) {
_txtLabel.setText(exc.getMessage());
exc.printStackTrace();
throw new java.lang.RuntimeException(exc.getMessage());
}
}
而且，disposing 处理程序清除 _officeComponentLoader 引用：
public void disposing(com.sun.star.lang.EventObject event) {
// remote bridge has gone down, because the office crashed or was terminated.
_officeComponentLoader = null;
_txtLabel.setText("disconnected");
}
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