import org.eclipse.jdt.launching.SocketUtil; //导入依赖的package包/类
private void configureJMXConnector(
        final KarafWorkingPlatformModel platformModel) throws CoreException {
    /*
     * Ensure that the RMI registry port for the JMX connector is unique
     */
    final int jmxRegistryPort = SocketUtil.findFreePort();

    if (jmxRegistryPort == -1) {
        throw new CoreException(new Status(
                IStatus.ERROR,
                KarafUIPluginActivator.PLUGIN_ID,
                "Could not find suitable TCP/IP port for JMX RMI Registry"));
    }

    final ManagementSection managementSection =
            (ManagementSection) platformModel.getAdapter(ManagementSection.class);

    managementSection.load();
    managementSection.setPort(jmxRegistryPort);
    managementSection.save();
}
 

import org.eclipse.jdt.launching.SocketUtil; //导入依赖的package包/类
private int getDebugPort() throws CoreException {
  int port = SocketUtil.findFreePort();
  if (port == -1) {
    abort("Cannot find free port for remote debugger", null, IStatus.ERROR); //$NON-NLS-1$
  }
  return port;
}
 

import org.eclipse.jdt.launching.SocketUtil; //导入依赖的package包/类
public static void startJetty(IProject project, JasperReportsConfiguration jContext) {
	try {
		if (server == null) {
			Integer p = jContext.getPropertyInteger(GlobalPreferencePage.JSS_JETTY_PORT);
			if (p == null || p.intValue() <= 0)
				port = SocketUtil.findFreePort();
			else
				port = p;

			if (port == -1)
				port = 8888;
			server = new Server(port);
			HandlerCollection hc = new HandlerCollection();
			contextHandlerCollection = new ContextHandlerCollection();
			hc.setHandlers(new Handler[] { contextHandlerCollection });
			server.setHandler(hc);

			server.start();

		}
		if (hmap.get(project) == null) {

			// server.stop();

			List<Handler> handlers = createContext(project, jContext);
			hmap.put(project, handlers);
			for (Handler h : handlers) {
				contextHandlerCollection.addHandler(h);
				h.start();
			}
		}
	} catch (Exception e) {
		throw new JRRuntimeException(e);
	}
}
 

import org.eclipse.jdt.launching.SocketUtil; //导入依赖的package包/类
@Before
public void setUp() {
	port = SocketUtil.findFreePort();
}