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我想动态创建我的 jsf 页面的内容。我要做的是构建一个组件编辑器。我在页面上放置了两个按钮。这是代码：

//Various imports;


@ManagedBean
@ViewScoped 
public class Elpad implements Serializable{
  private String padreCorrente = "Nessun padre è stato creato";
  private HtmlPanelGrid customGrid;
  private UIComponent padreCorrenteC;
  private List<SelectItem> items = new ArrayList<SelectItem>();
  private List<UISelectItems> listaItem = new ArrayList<UISelectItems>();
  private String itemScelto = "";

public Elpad() {
    //items = new ArrayList<SelectItem>();
    //items.add(0, new SelectItem("poba", "poba"));
    //items.add(1, new SelectItem("ripoba", "ripoba"));
}

public String getItemScelto() {
    return itemScelto;
}

public void setItemScelto(String itemScelto) {
    this.itemScelto = itemScelto;
}
private String ris ="";



public List<SelectItem> getItems() {
    return items;
}

public void setItems(List<SelectItem> items) {
    this.items = items;
}

public List<UISelectItems> getListaItem() {
    return listaItem;
}

public void setListaItem(List<UISelectItems> listaItem) {
    this.listaItem = listaItem;
}

public HtmlRadio getSelectedRadio() {
    return selectedRadio;
}

public void setSelectedRadio(HtmlRadio selectedRadio) {
    this.selectedRadio = selectedRadio;
}

public String getPadreCorrente() {
    return padreCorrente;
}

public void setPadreCorrente(String padreCorrente) {
    this.padreCorrente = padreCorrente;
}

public HtmlPanelGrid getCustomGrid() {
    return customGrid;
}

public void setCustomGrid(HtmlPanelGrid customGrid) {
    this.customGrid = customGrid;
}

public void aggiungiPadre(ActionEvent evt) {

    HtmlSelectOneListbox sor = new HtmlSelectOneListbox();
    FacesContext fc = FacesContext.getCurrentInstance();
    ELContext elcntx = fc.getELContext();
    Application app = fc.getApplication();
    ExpressionFactory xprfct = app.getExpressionFactory();
 ValueExpression ve = xprfct.createValueExpression(elcntx,"#{elpad.itemScelto}", String.class);
    ve.getValue(FacesContext.getCurrentInstance().getELContext());
    sor.setValueExpression("value", ve);

    log.error("Il componente HtmlSelectOneListbox sor è stato creato con ID : " + sor.getClientId() + " e ValueExpression : " + sor.getValueExpression("value") + " quindi ha valore : " + sor.getValue());

    UISelectItems a = new UISelectItems();

    items.add(0, new SelectItem("poba", "poba"));


 ValueExpression ve1 = xprfct.createValueExpression(elcntx,"#{elpad.items}", ArrayList.class);
    ve1.getValue(FacesContext.getCurrentInstance().getELContext());
    a.setValueExpression("valuee", ve1);

    log.error("Il componente UISelectItems a è stato creato con ID : " + a.getClientId() + " e ValueExpression : " + a.getValueExpression("valuee") + " quindi ha valore : " + a.getValue() + " per l'attributo items : " + items.get(0).getLabel() + " di dimensione : " + items.size() + " ;" );

    sor.getChildren().add(a);



    customGrid.getChildren().add(sor);
    padreCorrenteC = sor;

    /*FacesContext facesContext = FacesContext.getCurrentInstance();
    ELContext elContext = facesContext.getELContext();
    ValueExpression valueExpression = facesContext.getApplication().getExpressionFactory()
.createValueExpression(elContext, "#{elpad.items}", String.class);

    valueExpression.setValue(elContext, ris);*/



    padreCorrente = padreCorrenteC.getId();
}

public void aggiungiFiglio(ActionEvent evt) {

    items.add(new SelectItem(padreCorrente, padreCorrente.toString()));

}


}

那就是我的 XHTML 页面

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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:icecore="http://www.icefaces.org/icefaces/core"
      xmlns:ace="http://www.icefaces.org/icefaces/components"
      xmlns:ice="http://www.icesoft.com/icefaces/component"
      >
    <h:head>
        <title>Cambia padre</title>
    </h:head>
    <h:body>
        <ice:form> 
            <ice:panelGrid binding="#{elpad.customGrid}"> 
            </ice:panelGrid>
            <ice:commandButton value="Aggiungi padre" actionListener="#    {elpad.aggiungiPadre}"></ice:commandButton>
            <ice:commandButton value="Aggiungi figlio" actionListener="#    {elpad.aggiungiFiglio}"></ice:commandButton>
        </ice:form>
        <ice:outputLabel value="#{elpad.padreCorrente}"></ice:outputLabel>
    </h:body>
</html>

有人能帮我吗？我要做的是使用第一个按钮创建一个带有 SelectItems 子项的 SelectOneList，并使用第二个按钮将项目添加到列表中。我认为我在创建第二个 ValueExpression 时遗漏了一些东西（因为我尝试使用记录器进行一些测试并返回 null）但我不知道是什么

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