import org.osgi.service.permissionadmin.PermissionAdmin; //导入依赖的package包/类
/**
 * Constructs a new <code>PermissionManager</code> instance.
 * 
 * @param bc
 */
private PermissionManager(BundleContext bc) {
	ServiceReference ref = bc.getServiceReference(PermissionAdmin.class.getName());
	if (ref != null) {
		logger.trace("Found permission admin " + ref);
		pa = (PermissionAdmin) bc.getService(ref);
		bc.addBundleListener(this);
		logger.trace("Default permissions are " + ObjectUtils.nullSafeToString(pa.getDefaultPermissions()));
		logger.warn("Security turned ON");

	}
	else {
		logger.warn("Security turned OFF");
		pa = null;
	}
}
 

import org.osgi.service.permissionadmin.PermissionAdmin; //导入依赖的package包/类
private PermissionAdmin getPermissionAdmin() {
    BundleContext context = getBundleContext();
    return (PermissionAdmin) context.getService(context.getServiceReference(PermissionAdmin.class.getName()));
}