<jsp:include page=""> 与<%@ include file=""%>理解
2012-06-26 09:45
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1. 首先先介绍下,jsp机制:
servlet容器,先将jsp转化成servlet,然后编译成.class文件,放置容器缓冲区【tomcat的work目录下】。
每次调用jsp时,服务器会读取编译好的servler.class,处理jsp的请求。
2. <%@ include file="page.jsp"%>
在servlet容器转化jsp为servlet时,将引入的jsp源码全部添加到当前jsp,一并转化成一个servlet,然后编译。
【可以理解为整合一个servlet,一起编译,一次执行】
3.<jsp:include page="page.jsp"/>
发送请求给当前jsp,servlet调用当前jsp servlet编译后文件,到引用位置,调用编译后的page.jsp的servlet。class文件。【可以理解为,各自单独编译,互相调用编译的文件】
总结:
以下是对include 两种用法的区别,主要有两个方面的不同:
执行时间上:
<%@ include file=”relativeURI”%> 是在翻译阶段执行
<jsp:include page=”relativeURI” flush=”true” /> 在请求处理阶段执行.
引入内容的不同:
<%@ include file=”relativeURI”%>引入静态文本(html,jsp),在JSP页面被转化成servlet之前和它融和到一起.
<jsp:include page=”relativeURI” flush=”true” />引入执行页面或servlet所生成的应答文本.
另外在两种用法中file和page属性都被解释为一个相对的URI.如果它以斜杠开头,那么它就是一个环境相关的路径.将根据赋给应用程序的URI的前缀进行解释,如果它不是以斜杠开头,那么就是页面相关的路径,就根据引入这个文件的页面所在的路径进行解释。
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