JSF 2:从支持bean导航到外部URL

时间:2011-12-23 15:07:09

标签: url redirect jsf-2 external logout

这是问题的延伸 Navigate to external URL from a backing bean?

我需要在backing bean方法中使会话无效,然后转发到外部URL。 outputLink组件无法调用操作方法(在本例中为bean的注销方法)。 如果我使用commandLink,则会调用action方法,但在会话失效后,会在转发到外部URL之前创建另一个会话。

更具体一点:我有一个视图,可以在主页上加载项目列表。主页上有一堆链接(其中一个是注销图像/按钮),它们来自模板xhtml。在模板xhtml文件中,我有commandLink代码,它调用LogoutBean.java的logout方法。该方法按预期调用正常,但是当我在HomeBean的PostConstruct方法中放置一个断点时,我看到在使会话无效之后调用此方法然后它转发到外部URL。如何防止这种情况?

代码:

所引用:

                        <h:form>
                        <p:panel id="HomeHeaderPanel"  styleClass="tableheaderfont" style="width:98%">
                            <h:panelGrid id="filterGrid" columns="2" cellpadding="0" styleClass="normalfont" style="width: 98%" columnClasses="leftalign,rightalign">
                                <h:panelGroup>
                                    <h:link outcome="reviewHome.xhtml?faces-redirect=true" id="homeLink"
                                        title="Review Home">
                                        <h:graphicImage value="images/home_small.png" id="homeIcon" alt="Review Home"/>
                                    </h:link>
                                    <p:spacer width="5"/>

                                    <h:commandLink action="#{logoutBean.logout}" >  
                                        <h:graphicImage value="images/logout_small.png" id="logoutIcon" alt="Logout" title="Logout"/>
                                    </h:commandLink>  

                                </h:panelGroup>
                            </h:panelGrid>
                        </p:panel>
                    </h:form>

reviewHome.xhtml:

<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.prime.com.tr/ui">
<f:view contentType="text/html">
<ui:composition template="template.xhtml">
    <ui:define name="content">  
              <h:form styleClass="form" id="ptpReviewForm">

    <f:event listener="#{homeBean.refresh}" type="preRenderView" />...content here...
</h:form>
</ui:define>
    </ui:composition>
    </f:view>
    </html>

HomeBean.java:

@ManagedBean
@SessionScoped
public class HomeBean implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 3303546811067129792L;
public HomeBean(){}

@EJB
private ReviewEJB reviewEJB;
private List<HomeObject> homeList;


@SuppressWarnings("unused")
@PostConstruct
private void populateItpList()
{
    logger.debug("In the PostConstruct method");
    homeList = reviewEJB.getList();

}

//This method is loaded every time the Review Home view loads (prerenderView event)
public void refresh()
{
    String refresh = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("refresh");
    if(null != refresh && refresh.equalsIgnoreCase("true"))
    {
        homeList = reviewEJB.getList("another");
    }
} 

LogoutBean.java:

@ManagedBean
@SessionScoped
public class LogoutBean {


public void logout() throws ServletException
{

    try {
        ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
        ((HttpServletRequest) ec.getRequest()).logout();
        HttpSession session = (HttpSession) ec.getSession(false);

        // invalidate session
        if (session != null) {
            session.invalidate();
        }
        ec.redirect("/anotherWebAppContext/forward.jsp?link=review");

    }  catch (IOException e) {
        e.printStackTrace();
    }
}

1 个答案:

答案 0 :(得分:0)

这是由<f:event type="preRenderView">引起的,并且行为已完全指定。

基本上你想要杀死那个事件。我从来没有在这个构造中尝试过,所以我无法从经验中判断它是否有效,但您可以尝试通过UIViewRoot#getViewListenersForEventClass()获取事件,然后在重定向之前将其清除。

UIViewRoot viewRoot = FacesContext.getCurrentInstance().getViewRoot();
viewRoot.getViewListenersForEventClass(PreRenderViewEvent.class).clear();
// ...

理论上应该这样做。