只需让每个字段的required属性检查其他字段的提交值是否存在.提交的值可在客户端客户ID作为键的参数映射#{param}中获得.

Just let the required attribute of each field check the presence of the submitted value of the other fields. The submitted value is available in the parameter map #{param} by the client ID as key.

这是一个开球示例:

<h:form id="form">
    <h:inputText id="field1" ... required="#{empty param['form:field2'] and empty param['form:field3']}" />
    <h:inputText id="field2" ... required="#{empty param['form:field1'] and empty param['form:field3']}" />
    <h:inputText id="field3" ... required="#{empty param['form:field1'] and empty param['form:field2']}" />
</h:form>

随着字段数量的增加，它只会变得更加丑陋.

It gets only more ugly as the amount of fields grows.

或者，您可以使用 OmniFaces

Alternatively, you can use OmniFaces <o:validateOneOrMore>:

<h:form id="form">
    <h:inputText id="field1" ... />
    <h:inputText id="field2" ... />
    <h:inputText id="field3" ... />

    <o:validateOneOrMore id="oneOrMore" components="field1 field2 field3" />
    <h:message for="oneOrMore" />
</h:form>

请注意，以动作方法执行验证是错误的设计.为此，您应该使用标准的JSF验证工具，例如requiered，validator，<f:validator>和/或<f:validateXxx>.

Please note that performing validation in action method is bad design. You should use the standard JSF validation facilities for this such as requiered, validator, <f:validator> and/or <f:validateXxx>.