Jsf 2 在同一xhtml上保存和更新在primefaces中不起作用

嗨，我使用primefaces尝试了以下功能。 在我的xhtml中，我有一个输入字段，它接受输入并保存到数据库中。保存完成后，我将保存的数据显示在primefaces的数据表中。 到现在为止一切正常。现在我向datatable添加了单个选择。当用户单击行时，我用所选数据更新相同的输入列。 为此，我使用以下代码

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

我的Bean代码是：

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

@managedBean
@viewScoped
@component 
public class CurrencyBean implements Serializable{

    private static final long serialVersionUID = 1L;

    @Autowired
    private CurrencyMaster currencyMaster;

    private List<CurrencyMaster> currencyList;

    public CurrencyMaster getCurrencyMaster() {
        return currencyMaster;
    }

    public void setCurrencyMaster(CurrencyMaster currencyMaster) {
        this.currencyMaster = currencyMaster;
    }           
    public void saveCurrency(){
        try{
            currencyService.saveCurrency(currencyMaster);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    @PostConstruct
    public void currencyList(){
        setCurrencyList(currencyService.getCurrencyList());
    }
    public void onRowSelect(SelectEvent event) {}            
    public void onRowUnselect(UnselectEvent event) {}
}

@managedBean
@视域
@组成部分
公共类CurrencyBean实现了可序列化{
私有静态最终长serialVersionUID=1L；
@自动连线
私人货币管理人货币管理人；
私人名单；
公共CurrencyMaster getCurrencyMaster（）{
返回货币管理器；
}
公共无效设置CurrencyMaster（CurrencyMaster CurrencyMaster）{
this.currencyMaster=currencyMaster；
}           
公共无效存储货币（）{
试一试{
currencyService.saveCurrency（currencyMaster）；
}捕获（例外e）{
e、 printStackTrace（）；
}
}
@施工后
公共无效货币列表（）{
setCurrencyList（currencyService.getCurrencyList（））；
}
ROWSELECT（SelectEvent事件）{}
公共无效onRowUnselect（UnselectEvent事件）{}
}

因此，当我单击currencytable行时，输入字段将正确填充并更新操作

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

问题是，当我直接将数据输入到输入列时，我的globalMaster属性将为null

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

出现以下错误：

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

尝试使用空实体创建saveOrUpdate事件

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

我更改了bean的作用域，但没有找到解决方案

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

我为上述异常找到了更多解决方案，但我的问题是新值未设置为currencymaster

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>

---

我在这方面是否有任何错误。请指导我。

查看范围是从哪个包开始的？注释也是大写的。您也在使用spring吗？谢谢您的回复。javax.faces.bean.ViewScoped、javax.annotation.ManagedBean，我也使用了spring。将托管bean的导入包更改为this

javax.faces.bean.ManagedBean

很抱歉，我将javax.annotation.ManagedBean更改为javax.faces.bean.ManagedBean，但不起作用

<h:form id="form">
    <p:growl id="messages" />
    <p:panel id="panel" header="Currency">
        <h:panelGrid columns="2" id="currencyGrid">
            <p:outputLabel value="Currency :"/>
            <p:inputText value="#{currencyBean.currencyMaster.currDesc}"/>
        </h:panelGrid>
        <p:commandButton value="Add" action="#{currencyBean.saveCurrency}"
                         update="currencytable">
        </p:commandButton>

        <p:dataTable id="currencytable" var="cur" 
                     value="#{currencyBean.currencyList}" widgetVar="dlg"
                     selection="#{currencyBean.currencyMaster}" 
                     selectionMode="single" rowKey="#{cur.currId}">
            <p:ajax event="rowSelect" listener="#{currencyBean.onRowSelect}"
                    update=":form:currencyGrid" />
            <p:column headerText="ID" style="font-size:12px;">
                <h:outputText value="#{cur.currId}" />
            </p:column>
            <p:column headerText="Description" style="font-size:12px;">
                <h:outputText value="#{cur.currDesc}" />
            </p:column>
    </p:dataTable>
</h:form>