[英]how to transfer parameter from managedbean to a jsf page
I want to transfer a parameter from a jsf page to another jsf page. 我想将参数从jsf页面传输到另一个jsf页面。 Like this:
像这样:
a.xhtml 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 b.xhtml
<h:inputText value=#{param.id} />
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: 通过以前的方式,我将id从a.xhtml传输到b.xhtml,但是由于以下原因,我不想在外部公开“ ... b.xhtml?id = 5555”之类的参数:
return "b?id=" + param;
And the scope of ManagedBean is request. 而ManagedBean的范围是请求。 How can I do to solve this problem?
如何解决这个问题? Thanks.
谢谢。
如果您使用的是JSF 2或EL 2.2,则可以将其作为参数传递给方法
<h:commandLink class="navi" value="press" action="#{Bean.action(5555)}" />
You could also try viewParam 您也可以尝试viewParam
<f:metadata>
<f:viewParam name="id" value="#{bean.id}" />
</f:metadata>
It does basically the following: 它基本上执行以下操作:
You could pass the id on outcome link (b.xhtml?id=1, for example) and retrieve it on any Managed Bean. 您可以在结果链接上传递id(例如b.xhtml?id = 1),然后在任何Managed Bean上检索它。
If your bean is session scoped, this is easy. 如果您的bean是会话作用域的,这很容易。
Bean.java Bean.java
private String param;
public String action() {
HttpServletRequest request = (HttpServletRequest) FacesContext
.getCurrentInstance().getExternalContext().getRequest();
param = request.getParameter("id");
return "b?id=" + param;
}
public String getParam() {
return param;
}
xhtml 的xhtml
<h:inputText value=#{bean.param} />
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