在POST到外部URL之前执行一些JSF业务逻辑

Question

我的JSF页面上有以下表单，它发送到一个外部信用卡处理器。我希望使用JSF操作方法，这样我就可以编写一些业务逻辑。我如何从一个动作方法和包括下面的字段做帖子?

        <form action="#{checkoutBean.sagepayURL}" method="post"
            id="SagePayForm" name="SagePayForm">
            <input type="hidden" name="VPSProtocol"
                value="#{checkoutBean.sagepayMessage.vpsProtocol}" /> <input
                type="hidden" name="TxType"
                value="#{checkoutBean.sagepayMessage.transactionType}" /> <input
                type="hidden" name="Vendor"
                value="#{checkoutBean.sagepayMessage.vendor}" /> <input
                type="hidden" name="Crypt" class="crypt"
                value="#{checkoutBean.sagepayMessage.crypt}" /> <input
                type="submit" 
                value="Proceed to Checkout" />
        </form>

Answer 1

您可以使用JavaScript提交一个隐藏的JSF ajax表单，该表单反过来呈现一个提交支付表单的脚本。

<form action="#{checkoutBean.sagepayURL}" method="post"
    id="SagePayForm" name="SagePayForm">
    ...
    <input type="button" value="Proceed to Checkout" 
        onclick="document.getElementById('hiddenForm:link').click()" />
</form>
<h:form id="hiddenForm" style="display:none">
    <h:commandLink id="link" action="#{checkoutBean.preprocess}">
        <f:ajax render="@form" />
    </h:commandLink>
    <h:outputScript rendered="#{checkoutBean.preprocessed}">
        document.getElementById("SagePayForm").submit();
    </h:outputScript>
</h:form>

private boolean preprocessed; // +getter
public void preprocess() {
    // ...
    preprocessed = true;
}

---

根据您的问题历史，您似乎正在使用OmniFaces，在这种情况下，您还可以使用<o:commandScript>简化它，如下所示:

<form action="#{checkoutBean.sagepayURL}" method="post"
    id="SagePayForm" name="SagePayForm">
    ...
    <input type="button" value="Proceed to Checkout" onclick="preprocess()" />
</form>
<h:form>
    <o:commandScript name="preprocess" action="#{checkoutBean.preprocess}"
        oncomplete="document.getElementById('SagePayForm').submit()" />
</h:form>