页面组件化能带来很多优点，当多个页面引用同一个页面，这样，我们就只需要维护一个页面的代码，大大减轻开发人员的工作量。
假设网站的根目录为jsfApp，建立jsfApp/resources/echo目录，resources为默认的需要组件化的页面的根目录，echo为组件的前缀。
第一步
新增jsfApp/resources/echo/echoInputText.xhtml文件，内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:composite="http://java.sun.com/jsf/composite">
<h:head>
<title>myjsf</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
</h:head>
<!-- INTERFACE -->
<composite:interface>
<composite:attribute name="echo" />
</composite:interface>
<!-- IMPLEMENTATION -->
<composite:implementation>
<div style="padding: 20px;">
<span>请输入响应文字：</span>
<h:inputText value="#{cc.attrs.echo.echoText}"></h:inputText>
</div>
</composite:implementation>
</html>
注意
xmlns:composite="http://java.sun.com/jsf/composite"声明页面组件必须用到composite名字空间。
<composite:interface>传入的参数。
<composite:implementation>真正组件中的内容。
第二步
新增jsfApp/echo2.xhtml文件：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:echo="http://java.sun.com/jsf/composite/echo">
<h:head>
<title>myjsf</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
</h:head>
<body>
<div id="header"
style="padding: 100px 0 20px 100px; font-size: 22px; font-weight: bold; border-bottom: solid 1px red">
这个应声器的作者是：#{inputEcho.encoder.author}。</div>
<div>
<h:form id="form" style="padding:20px 0 20px 100px">
<echo:echoInputText echo="#{inputEcho}"></echo:echoInputText>
<div style="padding-left: 50px">
<h:commandButton id="post" style="padding:3px;100px;"
value="提交响应" action="echo2" />
</div>
</h:form>
</div>
<h:panelGroup id="after">
<div style="padding: 20px 0 0 100px">
响应：
<h:outputText id="echo" value="#{inputEcho.outText}" escape="false"></h:outputText>
</div>
</h:panelGroup>
</body>
</html>
xmlns:echo="http://java.sun.com/jsf/composite/echo"
<echo:echoInputText echo="#{inputEcho}"></echo:echoInputText>
@ManagedBean(name="inputEcho")
@SessionScoped
public class InputEcho implements Serializable {
/**
*
*/
private static final long serialVersionUID = 7599540489637124942L;
private String echoText = "";
private EchoEncoder encoder;
public InputEcho() {
encoder = new EchoEncoder();
}
/**
* @return the encoder
*/
public EchoEncoder getEncoder() {
return encoder;
}
/**
* @return the echoText
*/
public String getEchoText() {
return echoText;
}
public String getOutText() {
return encoder.Encode(echoText);
}
/**
* @param echoText the echoText to set
*/
public void setEchoText(String echoText) {
this.echoText = echoText;
}
public void echo() {
}
}
package com.zolcorp.myjsf.bean;
import java.io.Serializable;
public class EchoEncoder implements Serializable {
/**
*
*/
private static final long serialVersionUID = -5578888194809870790L;
private String author = "pout";
/**
* @return the author
*/
public String getAuthor() {
return author;
}
public String Encode(String msg) {
if(msg == null)
return null;
return msg.replaceAll("<", "<").replaceAll(">", ">").replaceAll("\n", "<br/>");
}
}
页面组件化能大大减少维护的工作量。JSF2里配置也很简单。