无法将字符串作为参数传递 JSF 2.3

Question

我正在使用 Primefaces 6.0 和 JSF 2.3，我将字符串作为参数传递，但它变成了空！ java:

FacesContext context = FacesContext.getCurrentInstance();
ExternalContext extContext = context.getExternalContext();
String redirected = extContext.encodeActionURL(context.getApplication().getViewHandler().getActionURL(context, url));

URIBuilder builder = new URIBuilder(redirected);
builder.addParameter("action", "A")
extContext.getFlash().setKeepMessages(true);
extContext.redirect(builder.toString());

XHTML:

......
<f:metadata>
    <f:viewParam name="action" value="#{mybean.action}" />
</f:metadata>
.......

当我传递 Boolean 或 Long 时它工作正常，下面是一个 Long 示例：

<f:viewParam name="id" value="#{mybean.id}" converter="javax.faces.Long" />

Answer 1

我添加了 OmniFaces 库，它运行良好：

pom.xml:

<dependency>
   <groupId>org.omnifaces</groupId>
   <artifactId>omnifaces</artifactId>
   <version>3.1</version>
</dependency>

XHTML:

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui"
//Add this tag
    xmlns:o="http://omnifaces.org/ui">

......
<f:metadata>
    <o:viewParam name="action" value="#{mybean.action}" />
</f:metadata>
.......

无法将字符串作为参数传递 JSF 2.3

Can't Pass String as parameter JSF 2.3

jsf

primefaces

omnifaces

viewparams

jsf-2.3