sitemesh body 失效的问题

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ include file="/WEB-INF/views/include/taglib.jsp"%>
<%@ taglib prefix="sitemesh" uri="http://www.opensymphony.com/sitemesh/decorator" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <title><sitemesh:title/></title>
    <%@include file="/WEB-INF/views/include/head.jsp" %>
    <sitemesh:head/>
</head>
<body <sitemesh:getProperty property="body.class" writeEntireProperty="true" />>
    <sitemesh:body/>
    <%@include file="/WEB-INF/views/include/footer.jsp" %>
</body>
</html>

用过的一看就明白了关键在这一句 : <sitemesh:getProperty property="body.class" writeEntireProperty="true" />

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