在我的页面的 preRender 代码中,我添加了 faces 消息,然后导航到另一个页面,如下所示:
if(error){
addMessageToComponent(null,"AN ERROR HAS OCCURRED");
FacesContext.getCurrentInstance().getExternalContext().getFlash()
.setKeepMessages(true);
navigateActionListener("myoutcome");
}
添加消息和导航的 util 方法是:
public static String getClientId(String componentId)
{
FacesContext context = FacesContext.getCurrentInstance();
UIViewRoot root = context.getViewRoot();
UIComponent c = findComponent(root, componentId);
return c.getClientId(context);
}
public static UIComponent findComponent(UIComponent c, String id)
{
if (id.equals(c.getId())) { return c; }
Iterator<UIComponent> kids = c.getFacetsAndChildren();
while (kids.hasNext())
{
UIComponent found = findComponent(kids.next(), id);
if (found != null) { return found; }
}
return null;
}
/**
* @param componentId
* : the id for the jsf/primefaces component without formId:
* prefix. <br>
* if you use null then the message will be added to the
* h:messages component.
**/
public static void addMessageToComponent(String componentId, String message)
{
if (componentId != null)
componentId = GeneralUtils.getClientId(componentId);
FacesContext.getCurrentInstance().addMessage(componentId,
new FacesMessage(message));
}
public static void navigateActionListener(String outcome)
{
FacesContext context = FacesContext.getCurrentInstance();
NavigationHandler navigator = context.getApplication()
.getNavigationHandler();
navigator.handleNavigation(context, null, outcome);
}
但消息未保存,因此重定向后不会出现。
请告知如何解决。