如何将参数从ManagedBean转移到jsf页面 [英] how to transfer parameter from managedbean to a jsf page

问题描述

我想将参数从jsf页面传输到另一个jsf页面.像这样:

I want to transfer a parameter from a jsf page to another jsf page. Like this:

a.xhtml

<h:form>
    <h:commandLink class="navi" value="press"
               action="#{Bean.action}">
        <f:param name="id" value="5555" />
    </h:commandLink>
</h:form>

Bean.java

Bean.java

public String action() {
    HttpServletRequest request = (HttpServletRequest) FacesContext
            .getCurrentInstance().getExternalContext().getRequest();
    String param = request.getParameter("id");
    return "b?id=" + param;
}

b.xhtml

<h:inputText value=#{param.id} />

按照以前的方式，我将id从a.xhtml传输到b.xhtml，但是由于以下这一行，我不想在外部公开"... b.xhtml?id = 5555"之类的参数:

By previous way, I transfer id from a.xhtml to b.xhtml, but I don't want to expose the parameter like "...b.xhtml?id=5555" outside because of this line:

return "b?id=" + param;

ManagedBean的范围是请求.我该怎么解决这个问题?谢谢.

And the scope of ManagedBean is request. How can I do to solve this problem? Thanks.

推荐答案

您也可以尝试 viewParam

<f:metadata>
    <f:viewParam name="id" value="#{bean.id}" />
</f:metadata>

它基本上执行以下操作:

It does basically the following:

• 通过名称ID获取请求参数值.
• 如有必要，对其进行转换和验证(您可以使用必填属性，验证器和转换器属性，并像一样将a和嵌套在其中)
• 如果转换和验证成功，则将其设置为由#{bean.id}表示的bean属性.

您可以在结果链接上传递ID(例如，b.xhtml?id = 1)，然后在任何托管Bean上检索它.

You could pass the id on outcome link (b.xhtml?id=1, for example) and retrieve it on any Managed Bean.

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