我对 Primefaces 3.4.1 有疑问。我需要从 ap:selectOneMenu 获取选定的值。我已经耗尽了谷歌，但没有任何帮助。这是我的 XHTML、控制器和 Bean。
XHTML：
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!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:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Bem Vindo</title>
</h:head>
<h:body>
<h:outputStylesheet library="primefaces-dot-luv" name="theme.css" />
<p:layout fullPage="true">
<p:layoutUnit position="west" size="200" header="Menu principal" resizable="true" closable="false" collapsible="true" >
<h:form id="menuForm">
<h:panelGrid>
<h:panelGroup>
<p:commandButton value="Cadastrar Cliente" actionListener="#{indexController.pagCliente}" style="font-size: 15px"/>
<p:commandButton value="Cadastrar Produto" actionListener="#{indexController.pagProduto}" style="font-size: 15px"/>
</h:panelGroup>
</h:panelGrid>
</h:form>
</p:layoutUnit>
<p:layoutUnit position="north" size="110" header="Selecionar Cliente" resizable="true" closable="false" collapsible="true" >
<p:selectOneMenu value="#{clienteController.idClient}" effect="fade" id="combo">
<f:selectItem itemLabel="Cliente" itemValue="" />
<f:selectItems value="#{clienteController.clientes}"
var="cli"
itemLabel="#{cli.nome}"
itemValue="#{cli.id}" />
<p:ajax listener="#{indexController.hideValida()}" update=":outPanel" />
</p:selectOneMenu>
</p:layoutUnit>
<p:layoutUnit position="center" header="Carrito" id="layoutCenter">
<p:outputPanel id="outPanel" autoUpdate="true">
<h:form id="form" rendered="#{indexController.hide}">
<p:dataTable id="tabelaVenda" var="vendas" value="#{clienteController.listarVendas}" style="font-size: 13px"
sortBy="#{clienteController.listaSale}" sortOrder="descending">
<p:column>
<f:facet name="header">
<h:outputText value="Produto"/>
</f:facet>
<h:outputText value="#{vendas.nomeProduto}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="R$ Unitario"/>
</f:facet>
<h:outputText value="#{vendas.valorUnitario}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Quantidade"/>
</f:facet>
<h:outputText value="#{vendas.quantidadeVenda}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Preço Total (R$)"/>
</f:facet>
<h:outputText value="#{vendas.valorTotal}"/>
</p:column>
<p:summaryRow>
<p:column colspan="3" style="text-align:right">
Total:
</p:column>
<p:column>
#{clienteController.total} R$
</p:column>
<p:column rendered="false"/>
</p:summaryRow>
<p:column>
<f:facet name="header">
<h:outputText value="Excluir"/>
</f:facet>
<h:commandLink action="#{clienteController.excluirProdutoVenda}" value="Cancelar Produto"/>
</p:column>
</p:dataTable>
<p:commandLink value="Agregar Produto" actionListener="#{clienteController.prepararAdicionar}"
style="font-size: 13px" update=":dialogForm:infosProduct" oncomplete="dialogSelectProd.show()"/>
<p:commandButton value="Finalizar Venda" actionListener="#{clienteController.adicionarVenda}"
style="font-size: 70%; float: right; vertical-align: bottom;" oncomplete="dialogPDFfactura.show()"/>
</h:form>
</p:outputPanel>
</p:layoutUnit>
</p:layout>
<p:dialog header="Selecionar Produto" widgetVar="dialogSelectProd" resizable="false" modal="true" showEffect="slide" width="500" >
<h:form id="dialogForm" style="font-size: 13px">
<h:panelGrid id="infosProduct" columns="2" style="margin-bottom:10px">
<p:dataTable id="tabela" var="produto" value="#{clienteController.listarProdutos}" style="font-size: 13px" rowKey="#{produto.nomeProduto}"
selection="#{clienteController.produto}" selectionMode="single">
<p:column>
<f:facet name="header">
<h:outputText value="Produto"/>
</f:facet>
<h:outputText value="#{produto.nomeProduto}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Quantidade Disponível"/>
</f:facet>
<h:outputText value="#{produto.quantidade}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Valor Unitario"/>
</f:facet>
<h:outputText value="#{produto.valor}"/>
</p:column>
</p:dataTable>
<h:outputLabel for="quantidadeVenda" value="Quantidade do Pedido: " />
<h:inputText id="quantidadeVenda" value="#{clienteController.venda.quantidadeVenda}"/>
<p:commandButton update=":form:tabelaVenda" oncomplete="dialogSelectProd.hide();" actionListener="#{clienteController.adicionarVendaTemp}" value="Adicionar no Carrinho"/>
</h:panelGrid>
</h:form>
</p:dialog>
<p:dialog header="Fatura" widgetVar="dialogPDFfactura" modal="true" showEffect="slide" >
<p:lightBox styleClass="PDFbox">
<p:media value="/pdf/eduardo.pdf" width="100%">
Your browser can't display pdf, <h:outputLink value="/pdf/eduardo.pdf">click</h:outputLink> to download pdf instead.
</p:media>
</p:lightBox>
</p:dialog>
控制器：
@ManagedBean
@SessionScoped
public class ClienteController {
private Cliente cliente;
private List<Cliente> clientes;
...
private long idClient;
public long getIdClient() {
return idClient;
}
public void setIdClient(long idClient) {
this.idClient = idClient;
}
public List<Cliente> getClientes() {
clientes = ClienteDaoImp.lista();
return clientes;
}
public void setClientes(List<Cliente> clientes) {
this.clientes = clientes;
}
客户等级：
@Entity
public class Cliente implements Serializable {
@Id
@GeneratedValue
private long id;
private String nome;
private String endereco;
...
组合中的列表填充了，但是在选择一个值时，该方法只会返回我的零。我做错了什么？