在JSF复合组件中实现回调方法

<facelet-taglib xmlns="http://java.sun.com/xml/ns/javaee"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
                version="2.0">
    <namespace>http://example.com/myComponent</namespace>
    <composite-library-name>myComponent</composite-library-name>
    <composite-component>
        <component-type>myComponent</component-type>
        <composite-extension>
            <namespace>http://example.com/myComponent</namespace>
        </composite-extension>
        <composite-attribute>
            <name>value</name>
            <type>java.lang.String</type>
        </composite-attribute>
        <composite-attribute>
            <name>callbackMethod</name>
            <type>java.lang.String</type>
        </composite-attribute>
    </composite-component>
</facelet-taglib>

<ui:component xmlns="http://www.w3.org/1999/xhtml"
              xmlns:ui="http://java.sun.com/jsf/facelets"
              xmlns:h="http://java.sun.com/jsf/html"
              xmlns:cc="http://xmlns.jcp.org/jsf/composite/http://example.com/myComponent">

    <cc:interface>
        <cc:attribute name="value" type="java.lang.String"/>
        <cc:attribute name="callbackMethod" type="java.lang.String"/>
    </cc:interface>

    <cc:implementation>
        <h:outputText value="#{cc.attrs.value}"/>
        <h:commandButton value="Click Me" action="#{cc.attrs.callbackMethod}"/>
    </cc:implementation>

</ui:component>