通过< h：message>重定向进行演示后保留FacesMessage在JSF中 [英] Preserving FacesMessage after redirect for presentation through <h:message> in JSF

问题描述

我认为这是一个常见的问题：某些托管bean有一个动作会向上下文添加一些消息：

I have what I suppose is a common problem: some managed bean has an action which adds some messages to the context:

FacesMessage fm = new FacesMessage("didn't work");
fm.setSeverity(FacesMessage.SEVERITY_ERROR);
FacesContext.getCurrentInstance().addMessage(null, fm);
return "some-outcome";

然后我将结果映射到 faces-config.xml 并将其配置为

Then I map the outcome in faces-config.xml and configure it to

<navigation-case>
    <from-outcome>some-outcome</from-outcome>
    <to-view-id>/view.xhtml</to-view-id>
    <redirect/>
</navigation-case>

在 view.xhtml 我提供信息：

<h:message globalsOnly="true" />

但是，它不起作用，因为执行重定向时邮件会丢失。

However, it does not work because the message is lost when the redirect is executed.

我该如何解决？我发现这个惊人的帖子解释如何使用 PhaseListener 来完成它，但我相信这种情况太常见了，不能用这种方式解决。我错了吗？我应该创建 PhaseListener 吗？或者是否有其他标准解决方案？

How would I solve it? I found this amazing post explaining how to do it using a PhaseListener but I believe this situation is too common to have to be solved this way. Am I wrong? Should I create the PhaseListener? Or is there some other, standard solutions?

推荐答案

BalusC像往常一样给出了很好的答案！

Great answer from BalusC as usual!

我只想添加，当我使用他的代码设置keepMessages属性时，它没有为会话设置，而是仅针对此请求（尽管它在Javadocs中说的是什么）。

I just want to add, when i used his code to set the keepMessages property, it was not set for the session, but only for this request (despite what it says in the Javadocs).

我将以下代码放入header.xhtml
< c：set target =＃{flash}property =keepMessagesvalue =true/>

I put the following code in my header.xhtml <c:set target="#{flash}" property="keepMessages" value="true" />

现在它适用于每一页，我不必每次在背景中都需要它豆。
你需要JSTL，不要忘记将以下内容放在你的xhtml标题中：
xmlns：c =http://java.sun.com/jsp/jstl/核心

Now it works on every page, without me having to set it every time i need it in the backing bean. You need JSTL for this and dont forget to put the following in your xhtml header: xmlns:c="http://java.sun.com/jsp/jstl/core"

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