Jsf 2 在commandLink中，我使用并在MBean中获得一个空parm

在我的jsf中，我使用：

<f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 

                <p:imageSwitch effect="turnDown" speed="10000">  
                    <ui:repeat value="#{galerieFloMB.stringArray}" var="image" >                         
                        <h:commandLink value="Voir l'annonce correspondante" actionListener="#{templateGP01MB.actionListener}" action="#{templateGP01MB.action}" >
                            <!-- <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" onclick="visualisationAnnonce('#{image}');" /> -->
                            <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" />
                            <f:attribute name="attributeName1" value="#{image}" />  
                            <f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 
                        </h:commandLink> 
                    </ui:repeat>   
                </p:imageSwitch> 

            </h:form>

在MBean VisualizationAnnoncemb.java中，我得到：

                <p:imageSwitch effect="turnDown" speed="10000">  
                    <ui:repeat value="#{galerieFloMB.stringArray}" var="image" >                         
                        <h:commandLink value="Voir l'annonce correspondante" actionListener="#{templateGP01MB.actionListener}" action="#{templateGP01MB.action}" >
                            <!-- <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" onclick="visualisationAnnonce('#{image}');" /> -->
                            <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" />
                            <f:attribute name="attributeName1" value="#{image}" />  
                            <f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 
                        </h:commandLink> 
                    </ui:repeat>   
                </p:imageSwitch> 

            </h:form>

    FacesContext fc = FacesContext.getCurrentInstance();
    Map<String, String> params = fc.getExternalContext().getRequestParameterMap();
    String parm1 = params.get("parm1");
    Integer integerParm1 = Integer.parseInt(parm1);

我得到了一个空指针，因为parm1=Null

                <p:imageSwitch effect="turnDown" speed="10000">  
                    <ui:repeat value="#{galerieFloMB.stringArray}" var="image" >                         
                        <h:commandLink value="Voir l'annonce correspondante" actionListener="#{templateGP01MB.actionListener}" action="#{templateGP01MB.action}" >
                            <!-- <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" onclick="visualisationAnnonce('#{image}');" /> -->
                            <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" />
                            <f:attribute name="attributeName1" value="#{image}" />  
                            <f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 
                        </h:commandLink> 
                    </ui:repeat>   
                </p:imageSwitch> 

            </h:form>

当然，我是一个新手，我不太了解jsf lyfecycle的所有内容。 如果有人能帮助我，那就太好了：

                <p:imageSwitch effect="turnDown" speed="10000">  
                    <ui:repeat value="#{galerieFloMB.stringArray}" var="image" >                         
                        <h:commandLink value="Voir l'annonce correspondante" actionListener="#{templateGP01MB.actionListener}" action="#{templateGP01MB.action}" >
                            <!-- <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" onclick="visualisationAnnonce('#{image}');" /> -->
                            <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" />
                            <f:attribute name="attributeName1" value="#{image}" />  
                            <f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 
                        </h:commandLink> 
                    </ui:repeat>   
                </p:imageSwitch> 

            </h:form>

提前谢谢

---

GLO

为什么要混合f:param和f:attribute？你为什么不选一个然后用两次呢？把它们混在一起没有任何意义，我不确定这一点，但这可能是它不起作用的原因

                <p:imageSwitch effect="turnDown" speed="10000">  
                    <ui:repeat value="#{galerieFloMB.stringArray}" var="image" >                         
                        <h:commandLink value="Voir l'annonce correspondante" actionListener="#{templateGP01MB.actionListener}" action="#{templateGP01MB.action}" >
                            <!-- <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" onclick="visualisationAnnonce('#{image}');" /> -->
                            <p:graphicImage value="/resources/images/download/#{image}" width="300" height="300" />
                            <f:attribute name="attributeName1" value="#{image}" />  
                            <f:param name="parm1" value="#{templateGP01MB.stringAnnId}" /> 
                        </h:commandLink> 
                    </ui:repeat>   
                </p:imageSwitch> 

            </h:form>