显示成功消息,然后使用PageFlow在超时后重定向到另一个页面

Question

如何显示成功消息,然后在超时(例如5秒)后将用户重定向到另一个页面？

登录成功后,我需要登录页面.我尝试了以下操作,我可以在登录失败时看到警告消息,但不能看到登录成功时的成功消息.它立即显示目标页面.

public String check(){
      if (username.equals("test") && password.equals("test")) {
          FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Sample info message", "PrimeFaces rocks!")); 
            return "Success";
        }else{
          FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN,"Sample warn message", "Watch out for PrimeFaces!"));  
            return "Failure";
        }
    }

我正在使用Seam的PageFlow进行导航.

我有一个

<p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />

在登录页面上.

Answer 1

它是Flash的一个实用程序.代替

FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Sample info message", "PrimeFaces rocks!"));:

只需使用此代码

FacesContext facesContext = FacesContext.getCurrentInstance();
Flash flash = facesContext.getExternalContext().getFlash();
flash.setKeepMessages(true);
flash.setRedirect(true);
facesContext.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Sample info message", "PrimeFaces rocks!"));

Answer 2

首先,使用您发布的代码,您将无法在重定向之前看到FacesMessage,您将在重定向后看到它.但是,为了实现这一点,您需要添加过滤器,因为重定向时消息会丢失.这是您需要的过滤器代码(不要忘记在web.xml中声明它):

public class MultiPageMessagesSupport implements PhaseListener {

private static final long serialVersionUID = 1250469273857785274L;
private static final String sessionToken = "MULTI_PAGE_MESSAGES_SUPPORT";

@Override
public PhaseId getPhaseId() {
    return PhaseId.ANY_PHASE;
}

/*
 * Check to see if we are "naturally" in the RENDER_RESPONSE phase. If we
 * have arrived here and the response is already complete, then the page is
 * not going to show up: don't display messages yet.
 */
@Override
public void beforePhase(final PhaseEvent event) {
    FacesContext facesContext = event.getFacesContext();
    int msg = this.saveMessages(facesContext);

    if (PhaseId.RENDER_RESPONSE.equals(event.getPhaseId())) {
        if (!facesContext.getResponseComplete()) {
            this.restoreMessages(facesContext);
        }
    }
}

/*
 * Save messages into the session after every phase.
 */
@Override
public void afterPhase(final PhaseEvent event) {
    if (event.getPhaseId() == PhaseId.APPLY_REQUEST_VALUES ||
            event.getPhaseId() == PhaseId.PROCESS_VALIDATIONS ||
            event.getPhaseId() == PhaseId.INVOKE_APPLICATION) {
        FacesContext facesContext = event.getFacesContext();
        int msg = this.saveMessages(facesContext);
    }
}

@SuppressWarnings("unchecked")
private int saveMessages(final FacesContext facesContext) {
    List<FacesMessage> messages = new ArrayList<FacesMessage>();
    for (Iterator<FacesMessage> iter = facesContext.getMessages(null); iter.hasNext();) {
        messages.add(iter.next());
        iter.remove();
    }

    if (messages.isEmpty()) {
        return 0;
    }

    Map<String, Object> sessionMap = facesContext.getExternalContext().getSessionMap();
    List<FacesMessage> existingMessages = (List<FacesMessage>) sessionMap.get(sessionToken);
    if (existingMessages != null) {
        existingMessages.addAll(messages);
    } else {
        sessionMap.put(sessionToken, messages);
    }
    return messages.size();
}

@SuppressWarnings("unchecked")
private int restoreMessages(final FacesContext facesContext) {
    Map<String, Object> sessionMap = facesContext.getExternalContext().getSessionMap();
    List<FacesMessage> messages = (List<FacesMessage>) sessionMap.remove(sessionToken);

    if (messages == null) {
        return 0;
    }

    int restoredCount = messages.size();
    for (Object element : messages) {
        facesContext.addMessage(null, (FacesMessage) element);
    }
    return restoredCount;
}
}

如果这对您不起作用,并且您需要在之前显示消息,那么您将需要执行以下操作:使方法返回void,通过ajax调用它,并在添加成功消息后调用一些javascript方法这将等待几秒钟,然后进行重定向(可能通过编程方式单击重定向到下一页的隐藏按钮).在我看来这不值得麻烦,你只会延迟登录过程.无论如何,用户将知道tlogin成功,因为他将重定向到主页(或您发送给他的任何页面)

编辑: 方法完成时,消息显示在页面中,因此在托管bean方法中等待将不起作用.添加FacesMessage后,使用

RequestContext.getCurrentInstance().execute("waitAndRedirect()");

在你的xhtml中,你需要有一个类似于这个的javascript函数:

function waitAndRedirect() {
    setTimeout(function() {
        hiddenButtonId.click();
    }, 2000);
}

其中hiddenButtonId是ap:按钮的ID,它重定向到主页并被隐藏(显示:无)

但同样,这是一个讨厌的方法,在我看来没有必要这样做,你只会延迟登录过程.