Question

我有两个日历，一个用于开始日期，一个用于结束日期。当我单击commandButton来触发方法updateAccount时，我收到错误消息：

Conversion Error setting value 'Tue Feb 26 16:41:43 EST 2013' for 'null Converter'.Conversion Error setting value 'Tue Feb 26 16:41:43 EST 2013' for 'null Converter'.
Conversion Error setting value 'Tue Feb 25 16:41:43 EST 2014' for 'null Converter'.Conversion Error setting value 'Tue Feb 25 16:41:43 EST 2014' for 'null Converter'.

commandButton应该使用selectmenu和calendars中的值作为SQL查询的参数重新加载页面。分配给日历的值是Date类型。是否导致此错误是因为日历的输出是String类型并尝试分配给Date类型的变量？从我在网上发现的例子中不需要转换器。这是不正确的？如果是这样，我该如何解决此错误消息。

我的JSF页面：

<f:metadata>
    <f:viewParam name="account" value="#{accountAnalysisBean.account}" />   
    <f:viewParam name="start" value="#{accountAnalysisBean.start}" />   
    <f:viewParam name="end" value="#{accountAnalysisBean.end}" />       
    <f:viewAction action="#{accountAnalysisBean.pullData}" /> 
</f:metadata>

<h:form>
    <p:panelGrid columns="6">
    <f:facet name="header"> 
    <p:selectOneMenu id="pickAccount" value="#{accountAnalysisBean.pickAccount}" required="true" >      
   <f:selectItems value="#{editAccountBean.allAccounts}" />                                 
        </p:selectOneMenu>
        <h:outputLabel value="Start Date: " />
        <p:calendar id="start" value="#{accountAnalysisBean.start}"  pattern="MM/dd/yyyy" navigator="true" />   
        <h:outputLabel value="End Date: " />
        <p:calendar id="end" value="#{accountAnalysisBean.end}" pattern="MM/dd/yyyy" navigator="true" />
        <p:commandButton value="Get Account" action="#{accountAnalysisBean.updateAccount}" > 
            <f:param name="start" value="#{accountAnalysisBean.start}"/>
            <f:param name="end" value="#{accountAnalysisBean.end}"/>    
            <f:param name="account" value="#{accountAnalysisBean.id}"/>
        </p:commandButton>
        </f:facet>
    </p:panelGrid>
</h:form>

我的豆子：

@ManagedBean
@ViewScoped
public class AccountAnalysisBean {

private String account = "";
private String id = "";
private String pickAccount = "";
private Date start;
private Date end;

//gettters and setters

public void pullData() {

    if (account != "") {

        //pull various fields from database given account value
    } else {    
        //set default null values
    }
}

public void updateAccount() {

fix = DAOFactory.getInstance("fix_site2.jdbc");
datalist = fix.getMyDataDAO();
id = datalist.findAccountID(pickAccount); //returns an ID from a DB given account selected from menu

ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
ec.redirect(ec.getRequestContextPath() + "/AccountAnalysis.xhtml?account=" + id + 
                "&start=" + start + "&end=" + end + "&includeViewParams=true");
}

//remained of code omitted for clarity

}

我正在使用JSF 2.2和Primefaces 4

Answer 1

您正在使用

<f:viewParam name="start" value="#{accountAnalysisBean.start}" />   
<f:viewParam name="end" value="#{accountAnalysisBean.end}" />

，这些属性是Date个对象，而请求参数是String，所以你需要一个转换器。

<f:viewParam name="start" value="#{accountAnalysisBean.start}" converter="javax.faces.DateTime">

应该有用。

信用：JSF 2.0: <f:viewParam> and default converters

1 个答案: