Redirect before loading the page in JSF2 [duplicate]

前端未结

关注

 1  1328

我在风中等你

相关标签:

1条回答

星月不相逢

2020-12-09 06:35

When on JSF 2.2, you can use <f:viewAction> for this.

<f:metadata>
    <f:viewParam name="paramName" value="#{bean.paramName}" />
    <f:viewAction action="#{bean.check}" />
</f:metadata>

(paramName is the name of your query string parameter)

private String paramName; // +getter+setter

public String check() {
    if (paramName == null) {
        return "error.xhtml";
    }

    return null;
}

When not on JSF 2.2 yet (JSF 2.0/2.1), you can use <f:event type="preRenderView"> for this.

<f:metadata>
    <f:viewParam name="paramName" value="#{bean.paramName}" />
    <f:event type="preRenderView" listener="#{bean.check}" />
</f:metadata>

private String paramName; // +getter+setter

public void check() throws IOException {
    if (paramName == null) {
        FacesContext.getCurrentInstance().getExternalContext().redirect("error.xhtml");
    }
}