如何正确地从JSF中的URL获取参数? [英] How to get parameters from the URL in JSF properly?
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问题描述
我相信有两种方法可以从JSF中的URL获取参数.
I believe there are 2 ways to get the parameters from the URL in JSF.
一个在豆子里:
Map<String, String> params =FacesContext.getCurrentInstance().
getExternalContext().getRequestParameterMap();
String parameterOne = params.get("parameterOne");
另一个在facelets页面中
and the other one being in the facelets page
<f:metadata>
<f:viewParam name="parameterOne" value="#{bean.parameterOne}"/>
</f:metadata>
很显然,后一个将在类中需要一个字段并为其进行getter/setter设置.
Obviously the latter one will require a field in the class and getter / setter for it.
此外,这两种不同方法之间有什么区别?应该首选哪一个?
Besides that, what are the differences between these 2 different approaches? Which one should be preferred?
推荐答案
我认为这可能会有所帮助: 从JSF页面获取请求和会话参数及属性
I think this may help: Get Request and Session Parameters and Attributes from JSF pages
实际上,应该有一个查询:
In fact, there should be a query:
<h:outputText value="#{param['id']}" />
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