Passing and getting parameters

As you will see in the next sections, JSF provides several approaches to pass/get parameters to/from Facelets, managed beans, UI components, and so on.

Using context parameters

Context parameters are defined in the web.xml file using the <context-param> tag. This tag allows two important children: <param-name>, which indicates the parameter name, and <param-value>, which indicates the parameter value. For example, a user-defined context parameter looks like the following code:

<context-param>
  <param-name>number.one.in.ATP</param-name>
  <param-value>Rafael Nadal</param-value>
</context-param>

Now, in a JSF page, you can access this parameter as shown in the following code:

<h:outputText value="#{initParam['number.one.in.ATP']}"/>
<h:outputText value="#{facesContext.externalContext.initParameterMap['number.one.in.ATP']}"/>

In a managed bean, the same context...