在JavaServer Faces中使用转换器

Question

我有那个转换器：

public class PollConverter implements Converter {

    private static PollanswersDao pollsDao = new PollanswersDao();

    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        return pollsDao.read(Long.parseLong(value));
    }

    public String getAsString(FacesContext context, UIComponent component, Object value) {
        return String.valueOf(((PollanswersEntity)value).getId());
    }
}

在faces-config.xml中：

<converter>
    <converter-id>PollsConverter</converter-id>
    <converter-class>org.test.majas.converters.PollConverter</converter-class>
</converter>

所以，我可以通过ID唯一识别民意调查。好吧，我使用这个转换器：

<h:form>
    <h:selectOneRadio layout="pageDirection" value="#{votesBean.answer}">
        <f:converter converterId="PollsConverter"/>
        <f:selectItems value="#{pollsBean.selectItems}" var="item" itemLabel="#{item.value.title}" />
    </h:selectOneRadio>
    <h:messages/>
    <h:commandButton value="#{msgs.vote}" action="#{votesBean.addVote}"/>
</h:form>

但是这个项目标签=＆＃34;＃{item.value.title}＆＃34;不工作我的selectItems项目标签是ID值...我如何将itemLabels显示为对象＆＃34; title＆＃34;领域。

PollsBean：

@Named
@SessionScoped
public class PollsBean implements Serializable {
    ...

    private List<SelectItem> selectItems;

    ...

    public List<SelectItem> getSelectItems() {
        return selectItems;
    }

    public void setSelectItems(List<SelectItem> selectItems) {
        this.selectItems = selectItems;
    }

...

}

感谢。