import net.sourceforge.stripes.action.SessionScope; //导入依赖的package包/类
/**
 * Returns the ActionBean class that is bound to the UrlBinding supplied. If the action
 * bean already exists in the appropriate scope (request or session) then the existing
 * instance will be supplied.  If not, then a new instance will be manufactured and have
 * the supplied ActionBeanContext set on it.
 *
 * @param path a URL to which an ActionBean is bound, or a path starting with the URL
 *        to which an ActionBean has been bound.
 * @param context the current ActionBeanContext
 * @return a Class<ActionBean> for the ActionBean requested
 * @throws StripesServletException if the UrlBinding does not match an ActionBean binding
 */
public ActionBean getActionBean(ActionBeanContext context, String path) throws StripesServletException {
    Class<? extends ActionBean> beanClass = getActionBeanType(path);
    ActionBean bean;

    if (beanClass == null) {
        throw new ActionBeanNotFoundException(path, getUrlBindingFactory().getPathMap());
    }

    String bindingPath = getUrlBinding(beanClass);
    try {
        HttpServletRequest request = context.getRequest();

        if (beanClass.isAnnotationPresent(SessionScope.class)) {
            bean = (ActionBean) request.getSession().getAttribute(bindingPath);

            if (bean == null) {
                bean = makeNewActionBean(beanClass, context);
                request.getSession().setAttribute(bindingPath, bean);
            }
        }
        else {
            bean = (ActionBean) request.getAttribute(bindingPath);
            if (bean == null) {
                bean = makeNewActionBean(beanClass, context);
                request.setAttribute(bindingPath, bean);
            }
        }

        setActionBeanContext(bean, context);
    }
    catch (Exception e) {
        StripesServletException sse = new StripesServletException(
            "Could not create instance of ActionBean type [" + beanClass.getName() + "].", e);
        log.error(sse);
        throw sse;
    }

    assertGetContextWorks(bean);
    return bean;

}