Primeface URL跳转 和参数传递

   <p:column  headerText="跳转">
                             <h:outputLink value="ProcessManage.xhtml">
                                 <f:param name="projectnum" value="#{pro.processproject}" />
                                 <h:outputText value=" 跳转到进度管理" />
                             </h:outputLink>
                             </p:column>

   HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
       String[] projectnumS=request.getParameterMap().get("projectnum")   ;
       if (projectnumS==null||projectnumS.length==0)
        projectList=crService.selectProject(this.operid,this.branchid) ;
       else {
           projectList=crService.selectProject(this.operid,this.branchid,projectnumS) ;
       }