How to get request parameter form JSP page in Facelets page?

facelets, jsf-2

Solution

All request parameters are in EL available by the `#{param}` map. Thus, this should do:

<p>Username: #{param.txtUsername}</p>
<p>Password: #{param.txtPassword}</p>

If you need to preprocess them by Java code, better put them as managed properties or view parameters in the backing bean class associated with `login.xhtml`.

Managed property example:

@ManagedBean
@RequestScoped
public class Login {

    @ManagedProperty("#{param.txtUsername}")
    private String username;

    @ManagedProperty("#{param.txtPassword}")
    private String password;

    @PostConstruct
    public void init() {
        // Do here your thing with those parameters.
        System.out.println(username + ", " + password);
    }

    // ...
}

View parameter example:

<f:metadata>
    <f:viewParam name="txtUsername" value="#{login.username}" required="true" />
    <f:viewParam name="txtPassword" value="#{login.password}" required="true" />
    <f:event type="preRenderView" listener="#{login.init}" />
</f:metadata>

with

@ManagedBean
@RequestScoped
public class Login {

    private String username;
    private String password;

    public void init() {
        // Do here your thing with those parameters.
        System.out.println(username + ", " + password);
    }

    // ...
}

See also:

- ViewParam vs @ManagedProperty(value = "#{param.id}")

- Communication in JSF 2.0 - Processing GET request parameters

Problem

Original source

Related problems

• ViewParam vs @ManagedProperty(value = "#{param.id}")