与JSF在幕后所做的相同:获取HTTP请求参数.如果您熟悉基本的HTML，那么您就会知道每个HTML输入元素都会将其name=value对作为HTTP请求参数发送.

Just do the same as JSF is doing under the covers: grabbing the HTTP request parameter. If you're familiar with basic HTML, you know that every HTML input element sends its name=value pair as HTTP request parameter.

给出一个

<h:form id="formId">
    <p:inputText id="userId" /> <!-- Note: no value attribute at all, also no empty string! -->
    ...
    <p:commandButton value="submit" action="#{bean.submit}" />
</h:form>

基本上会生成 以下HTML

which generates basically the following HTML

<form id="formId" name="formId">
    <input type="text" name="formId:userId" ... />
    ...
    <button type="submit" ...>submit</button>
</form>